Repeat injection after an inadequate response

**My Thought Process on Denying the Repeat Epidural Steroid Injection**

Alright, let's break down this prior authorization request for a repeat lumbar epidural steroid injection. My primary goal here is to ensure I'm adhering strictly to Medical Policy MP-517.

The request is for a transforaminal lumbar epidural steroid injection at the left L4-L5 level, and crucially, it's for a *second* injection. The member is a 48-year-old presenting with left L4 radicular pain, which they rate at a significant 7/10, and it's impacting their ability to walk. This immediately tells me we're dealing with a potentially debilitating condition.

I've reviewed the supporting documentation, and the MRI findings are relevant – it shows left L4-L5 foraminal narrowing with demonstrable nerve root contact. This aligns with the member's reported radicular pain.

Now, let's look at the conservative management. They've undergone physical therapy from January 8, 2026, to February 26, 2026 – that's over four weeks, which is good. They're also on gabapentin for pain management. So, the prerequisite for trying conservative therapies has been met.

The critical piece of information for a *repeat* injection is the outcome of the previous one. The prior injection was on May 28, 2026. The follow-up note from June 25, 2026, indicates approximately 30% pain relief that lasted for about three weeks. This is where I need to be very precise.

I'll now systematically run through the policy criteria:

*   **Criterion A: Indication.** Is there radicular pain corroborated by imaging? Yes, the member has left L4 radicular pain, and the MRI shows foraminal narrowing with nerve root contact at L4-L5. So, this is met.

*   **Criterion B: Conservative Therapy.** Has the member had more than four weeks of physical therapy and appropriate pharmacological management? Yes, as noted, PT was completed for over four weeks, and they are on gabapentin. This is met.

*   **Criterion C: Function.** Is there a functional deficit due to pain? A 7/10 pain score that limits walking clearly indicates a significant functional impairment. This is met.

Now, for the **repeat injection criteria**, which are the most stringent for subsequent procedures:

*   **R1: Efficacy of the prior injection.** This is the key. The policy requires *at least 50% relief of pain for at least six weeks* after the prior injection. The documented relief was approximately 30% for about three weeks. This is a clear mismatch. 30% is significantly less than 50%, and three weeks is less than six weeks. Therefore, R1 is *not* met.

*   **R2: Frequency of repeat injections.** Is this no more than three injections in a rolling 12-month period? This is the second injection, so this criterion is met.

*   **R3: Interval between injections.** Is there no repeat within 14 days? The prior injection was on May 28, 2026, and the current request is for July 16, 2026. This interval is well over 14 days, so this is met.

*   **Exclusions:** I've also scanned for any specific exclusions within the policy that might apply, and none appear to be relevant in this case.

The decision point is clear: because R1, the efficacy criterion for repeat injections, has not been met, the request must be denied. The policy explicitly states the need for at least 50% relief for at least six weeks, and the provided documentation shows substantially less effect.

My internal validation then checks the expected output:
*   Decision string: "deny" - Confirmed.
*   Criteria array: ["R1"] - Confirmed, as this is the specific criterion that was not met.
*   Rationale length: The rationale needs to be concise, under 40 words. My explanation that "The record indicates only 30 percent relief lasting three weeks from the prior injection, which does not meet the requirement of at least 50 percent relief for six weeks" is 27 words. This fits the length requirement.

So, based on the strict application of MP-517, specifically the efficacy requirement for repeat epidural steroid injections, this request cannot be approved.

**My Thought Process Regarding the Lumbar Epidural Steroid Injection Request**

Alright, let's break down this request for a second lumbar epidural steroid injection. My first step is always to identify the core of the request and then systematically evaluate it against the established criteria.

The request itself is for a second lumbar epidural steroid injection, specifically a transforaminal one targeting the left L4-L5 level. This is crucial information for context.

Now, I need to assess if the patient's condition warrants this intervention. The patient presents with radicular pain, specifically at the L4 level, and is reporting a pain score of 7 out of 10. Crucially, their MRI confirms left L4-L5 foraminal narrowing with demonstrable nerve root contact. This unequivocally satisfies criteria A (presence of radicular symptoms with objective findings) and C (demonstration of nerve root compression or irritation on imaging). So, based on the immediate clinical picture and imaging, the *indication* for an epidural steroid injection is certainly present.

Next, I consider criterion B, which relates to the prior conservative care. The provided information states that the patient has undergone physical therapy between January and February of 2026 and has been on gabapentin. This clearly fulfills criterion B, demonstrating that appropriate conservative measures have been attempted and failed to provide sufficient relief.

The request specifies this is a *repeat* injection. This immediately flags the need to consult the policy's requirements for repeat procedures. The prior injection occurred on May 28th, 2026. The current request is dated July 16th, 2026, with follow-up notes from June 25th, 2026.

The policy for repeat injections has specific requirements, and the most relevant one here is R1. It states that a repeat injection requires documentation of at least 50 percent relief of pain for a duration of at least 6 weeks following the prior injection. This is the critical threshold I need to scrutinize.

Looking at the provided follow-up notes from June 25th, 2026, the patient's reported relief from the prior injection is described as "approximately 30 percent relief lasting about three weeks, now back to baseline." This information directly contradicts the requirement of R1. The relief achieved was only 30 percent, and it only lasted for approximately three weeks, falling significantly short of the 50 percent for 6 weeks mandate.

Therefore, based on the explicit failure to meet R1, the decision is to deny the request.

The primary criterion I will cite for the denial is R1. The rationale stems directly from the patient's reported outcomes: the member achieved only approximately 30 percent pain relief for about three weeks from the prior injection. This does not meet the policy's requirement of at least 50 percent relief for at least 6 weeks for a repeat epidural steroid injection.

I've also performed a quick mental check of exclusions. There's no mention of coagulopathy or active infection, which would be absolute contraindications. The patient does have radicular pain, which is the condition we're treating, so no exclusions apply here.

Now, let's quickly re-verify R2 and R3 to be thorough. R2 pertains to the number of prior injections. This is the *second* injection requested, and the prior was on May 28th, 2026, so R2 is met. R3 relates to the timing of repeat injections. The prior injection was on May 28th, 2026, and the current request is in July 2026 (with the follow-up in June). The time elapsed is more than 14 days, so R3 is also met.

So, to reiterate, only R1 is not satisfied.

The decision is to deny. The criteria for denial are indeed ["R1"]. The rationale needs to be concise and accurately reflect the policy violation. My initial wording for the rationale was "The member experienced only 30% relief for 3 weeks from the prior injection, which does not meet the requirement of at least 50% relief for 6 weeks for a repeat injection." I've tightened this slightly to: "The repeat injection is denied because the prior injection provided only 30 percent relief for three weeks, failing to meet the requirement of at least 50 percent relief for at least 6 weeks." This is 34 words and clearly communicates the reason for denial.

Everything seems to be in order. The analysis is complete.

**My Thought Process on Lumbar Epidural Steroid Injection Policy MP-517**

Alright, let's break down this request for a repeat lumbar epidural steroid injection. My primary responsibility is to apply policy MP-517 accurately. This is a request for a *second* injection, so I need to focus on the "Repeat Injections" criteria, alongside the foundational criteria.

First, I need to establish the basic requirements for *any* epidural steroid injection, which are criteria A, B, and C.

*   **Criterion A (Indication):** Does the patient have the correct diagnosis and supporting imaging? The patient is presenting with left L4 radicular pain, and the MRI from February 2026 shows left L4-L5 foraminal narrowing with nerve root contact. This perfectly aligns with the indication. So, A is met.
*   **Criterion B (Conservative Therapy):** Has the patient undergone adequate conservative treatment? The record indicates physical therapy from January to February 2026 (which is over four weeks) and ongoing gabapentin. This satisfies the requirement for conservative therapy. So, B is met.
*   **Criterion C (Functional Limitation/Pain Score):** Is there significant pain or functional limitation? The patient reports 7/10 pain, which is limiting their walking. This clearly meets the functional limitation requirement. So, C is met.

Now, for the core of this request – the repeat injection itself. This requires me to evaluate criteria R1, R2, and R3.

*   **Criterion R1 (Prior Relief):** This is critical for repeat injections. The policy states that a repeat injection requires *at least 50 percent relief of pain for at least 6 weeks* after the prior injection. The patient's prior injection was on May 28, 2026. The follow-up note on June 25, 2026, explicitly states "approximately 30 percent relief lasting about three weeks." This is a clear failure. 30% is less than 50%, and three weeks is less than six weeks. R1 is *not* met.

*   **Criterion R2 (Frequency Limit):** I need to check the number of injections in a rolling 12-month period. This is the second injection (May 2026 was the first, July 2026 would be this one). The policy allows no more than three injections in 12 months. So, R2 is met.

*   **Criterion R3 (Timing):** Is there sufficient time between injections? The prior injection was on May 28, 2026, and the request is for July 16, 2026. The gap is over 14 days (it's roughly 49 days). So, R3 is met.

I also briefly review the exclusions (X1, X2, X3) and documentation requirements (E1, E2, E3) to ensure they don't trigger a denial or a pend. The patient has no reported infection or anticoagulation issues, and radicular pain is present. Imaging, dates, and relief documentation are all present.

The crucial point is R1. The policy is unambiguous: a repeat injection *requires* specific prior relief outcomes. Since the documented relief (30% for three weeks) does not meet the required threshold (50% for six weeks), this request must be denied based on R1.

There's a thought about whether this should be a "PEND" due to missing documentation for R1. However, the documentation *is* present; it simply shows the patient did not meet the criteria. Therefore, it's a denial, not a pend.

My decision is to deny the request based on criterion R1. The rationale needs to be concise, directly stating the reason for denial and referencing the failed criterion.

Final structure for the output:
*   **Decision:** deny
*   **Criteria:** ["R1"]
*   **Rationale:** Concise statement about the failed relief and duration, referencing the policy requirement.

```json
{
  "decision": "deny",
  "criteria": [
    "R1"
  ],
  "rationale": "The repeat injection is denied because the prior injection provided only 30 percent relief for three weeks, failing the requirement for at least 50 percent relief for at least 6 weeks."
}
```

**My Thought Process Regarding the Transforaminal Lumbar Epidural Steroid Injection Request**

Alright, let me walk through my reasoning for this particular request. I'm looking at a request for a transforaminal lumbar epidural steroid injection, specifically at the left L4-L5 level. This is noted as a *repeat* injection for a 48-year-old member.

First, I need to assess if the initial criteria for a *single* injection are met.
*   **Criterion A:** This involves having radicular pain and supporting imaging. The member presents with left L4 radicular pain, and their MRI from February 19, 2026, shows left L4-L5 foraminal narrowing with nerve root contact. This clearly meets Criterion A.
*   **Criterion B:** This requires documented conservative therapy, including physical therapy for at least four weeks and appropriate medication. The records indicate physical therapy from January 8 to February 26, 2026, which is more than four weeks, and gabapentin was prescribed. So, Criterion B is also met.
*   **Criterion C:** This relates to the severity of pain or functional limitation. The member reports a pain score of 7/10 and notes limited walking. This definitely satisfies Criterion C.

So, the baseline criteria for an initial injection are met. However, this is a *repeat* injection, so I need to consider the specific repeat injection criteria. The policy outlines these as R1, R2, and R3.

*   **Criterion R1:** This is crucial for repeat injections. It states that a repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection. I need to check the documentation for the previous injection. The prior injection was on May 28, 2026. A note from June 25, 2026, indicates that the relief was "approximately 30 percent relief lasting about three weeks." This is the critical point. The patient achieved only 30% relief, and it lasted only about three weeks. This falls significantly short of the 50% relief for 6 weeks requirement. Therefore, Criterion R1 is *not* met.

*   **Criterion R2:** This pertains to the frequency of injections, stipulating no more than three in a 12-month period. This is noted as the *second* injection, so it meets this criterion.

*   **Criterion R3:** This concerns the timing between injections, requiring at least a 14-day gap. The prior injection was on May 28, 2026, and the current request date is after July 16, 2026 (implied by the context of the notes). This is well over the 14-day requirement, so R3 is met.

I also reviewed the exclusions (X1, X2, X3) to ensure none applied. The records indicate no infection, no anticoagulation issues, and that radicular pain *is* present, so none of the exclusions trigger a denial.

The core issue here is R1. The documentation explicitly shows that the prior injection did not provide the required level of sustained relief (50% for 6 weeks). It's not a matter of missing documentation; the documentation provided demonstrates a failure to meet the success threshold for repeat injections. Therefore, it's not a "pend" situation due to lack of information, but a clear denial based on the provided outcomes.

My decision is to **deny** the request. The specific criterion not met is **R1**.

The rationale for this denial is straightforward: The prior injection provided only 30 percent relief for three weeks, which does not meet the established requirement of at least 50 percent relief for at least six weeks for a repeat injection to be considered.

Based on this, my final output will be:
```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The request is denied because the prior injection provided only 30 percent relief for three weeks, failing the requirement for at least 50 percent relief for at least six weeks."
}
```

**My Thought Process on Approving/Denying the Transforaminal Epidural Steroid Injection Request**

Alright, let's break down this request for a repeat transforaminal lumbar epidural steroid injection at the left L4-L5 level for this 48-year-old member. My primary goal is to ensure we're adhering strictly to the policy guidelines for both initial and repeat injections, ensuring medical necessity and appropriate utilization of resources.

First, I need to evaluate the indication for the injection. The member presents with left L4 radicular pain, rated at a significant 7/10, which is markedly limiting their ability to walk. This clinical presentation is directly supported by the MRI from February 19, 2026, which shows left L4-L5 foraminal narrowing with clear evidence of nerve root contact. So, criterion A, the presence of a specific diagnosis corroborated by imaging, is definitely met.

Next, I'll look at the requirement for conservative care. The policy stipulates more than four weeks of physical therapy (PT) and pharmacological therapy with inadequate relief. The provided information shows PT from January 8 to February 26, 2026, which is indeed more than four weeks, and Gabapentin is ongoing. Given the persistent 7/10 pain score despite these interventions, the indication of inadequate relief is also met. This satisfies criterion B.

Criterion C, concerning pain and functional limitations, is also clearly met. The member's pain is rated at 7/10, and it's explicitly stated that this pain limits their activities of daily living, specifically walking.

Now, for the crucial part: evaluating the criteria for a *repeat* injection. This is where the specific policy for subsequent procedures comes into play, and it has several components: R1, R2, and R3.

I need to assess R1, which states that a repeat injection requires "at least 50 percent relief of pain for at least 6 weeks after the prior injection." I'm looking at the documentation for the previous injection, which was performed on May 28, 2026. The record clearly states that the member experienced "approximately 30 percent relief lasting about three weeks." Immediately, I see a disconnect. 30 percent relief falls far short of the required 50 percent, and the duration of three weeks is less than the required six weeks. Therefore, criterion R1 is definitively *not met*.

Next, I'll review R2. This criterion specifies "No more than 3 injections in a rolling 12-month period." This is the member's second injection (the first being on May 28, 2026). Since this would be the second in the 12-month period, this criterion is met.

Then, there's R3: "No repeat injection within 14 days of a prior injection." The prior injection was on May 28, 2026, and the current request is dated July 16, 2026. This is well over the 14-day waiting period, so R3 is also met.

However, the policy is quite clear: for a repeat injection, specific criteria must be met, and R1 is a mandatory one. When a specific criterion is affirmatively not met, especially one as significant as the efficacy of the previous treatment, the decision logically defaults to a denial. In this case, R1 is the sole criterion that was not met, and it's a direct failure to demonstrate sufficient prior benefit.

I also need to quickly confirm that there are no exclusion criteria that would prevent an injection, even if the criteria were met. The exclusions are: no systemic infection (X1), no anticoagulants (X2), and the pain is radicular (not just axial) (X3). The information provided doesn't indicate any of these exclusions are present. The pain is radicular and supported by imaging, and there's no mention of infection or anticoagulants. So, the exclusions are not a factor in this decision.

Therefore, my decision is to **deny** the request for a repeat injection. The specific criterion that was not met is R1.

My rationale needs to be concise and accurately reflect the reason for denial. Based on the policy, the previous injection simply did not provide the required level of relief to justify a repeat at this time. The documentation explicitly shows only 30 percent relief for three weeks, failing the requirement for at least 50 percent relief for six weeks. This is the core reason for the denial.

After reviewing the documentation and cross-referencing with the policy, the final output is a denial based on the failure to meet R1, with a clear and concise rationale stating that the prior injection's efficacy did not meet the required standard. The rationale is: "The repeat injection is denied because the prior injection provided only 30 percent relief for three weeks, failing the requirement for at least 50 percent relief for six weeks." This is 29 words, well within the acceptable limit.

My decision is:
```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The repeat injection is denied because the prior injection provided only 30 percent relief for three weeks, failing the requirement for at least 50 percent relief for six weeks."
}
```

Let me work through this prior authorization request against MP-517.

Request: Transforaminal lumbar epidural steroid injection, left L4-L5, second injection (repeat).

Policy requirements:

A. INDICATION — radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with symptoms.
- Left L4 radicular pain; MRI shows left L4-L5 foraminal narrowing with nerve root contact. Met.

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (PT and pharmacologic therapy) with inadequate relief.
- PT 2026-01-08 through 2026-02-26 (7 weeks) with inadequate relief; gabapentin ongoing. Met.

C. FUNCTION — pain score ≥5/10 or functional limitation affecting ADLs.
- 7/10 pain, limiting walking. Met.

Repeat injections:
R1. Repeat injection requires at least 50% relief of pain for at least 6 weeks after prior injection.
- Prior injection 2026-05-28; follow-up 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline." That's 30% relief for 3 weeks — affirmatively does NOT meet 50% for 6 weeks. R1 not met → deny.

R2. No more than 3 injections in rolling 12 months — this would be 2nd, fine.
R3. No repeat within 14 days — prior was 2026-05-28, request history dated 2026-07-16; more than 14 days. Fine.

Exclusions:
X1 infection — none. X2 anticoagulant — none. X3 axial pain without radicular component — has radicular pain. None apply.

Documentation: imaging report submitted (E1 satisfied), conservative therapy dates given (E2 satisfied), repeat relief documented (E3 satisfied — it's documented, it just fails R1).

Decision: deny. The record affirmatively contradicts R1 (30% relief lasting 3 weeks, vs required 50% for 6 weeks).

Criteria: R1 only.

Rationale: under 40 words, one or two sentences.

Okay, I've reviewed the prior authorization request for a transforaminal lumbar epidural steroid injection. Here's my thought process as a health plan analyst applying MP-517:

First, I need to confirm that I understand the task: I'm evaluating a request for a *second* epidural steroid injection for a 48-year-old member experiencing left L4 radicular pain. My output needs to be a JSON object with `decision`, `criteria`, and `rationale` keys. I must strictly adhere to Medical Policy MP-517.

My first step is to break down the provided information and systematically compare it against the policy's criteria.

**Analyzing the Request:**

*   **The Patient:** 48 years old.
*   **The Service:** Transforaminal lumbar epidural steroid injection, specifically at the left L4-L5 level. Crucially, this is noted as a *second* injection.
*   **The Problem (History):** They reported left L4 radicular pain on 2026-07-16 with a pain score of 7/10, which was limiting their ability to walk.
*   **The Imaging:** An MRI from 2026-02-19 showed left L4-L5 foraminal narrowing with direct contact on the nerve root. This is important because it corroborates the location of the pain.
*   **The Conservative Care:** They underwent physical therapy from 2026-01-08 to 2026-02-26, which is over 4 weeks. They are also on ongoing gabapentin (pharmacologic therapy). The request states relief from these measures was "inadequate."
*   **The Prior Injection:** This is key for a repeat request. A previous injection was given on 2026-05-28. A follow-up on 2026-06-25 indicated "approximately 30 percent relief lasting about three weeks, now back to baseline."
*   **Exclusions:** No mention of anticoagulation issues or active infection.

**Applying Medical Policy MP-517:**

Now, I'll go through the policy section by section. Since this is a repeat injection, I need to assess both the initial criteria (which must have been met for the first injection) and the specific criteria for repeat injections.

**Initial Criteria (A, B, C) - Essential for any injection:**

*   **Criterion A (Indication):** Does the request show radicular pain in a dermatomal distribution, supported by imaging showing nerve root compression or stenosis at a corresponding level?
    *   *Analysis:* Yes. The member has "Left L4 radicular pain," and the MRI confirms "left L4-L5 foraminal narrowing with nerve root contact." This aligns perfectly.
    *   *Met?* Yes.

*   **Criterion B (Conservative Therapy):** Has the member undergone at least 4 weeks of physical therapy and pharmacologic therapy with inadequate relief?
    *   *Analysis:* Yes. Physical therapy lasted over 4 weeks (Jan 8 to Feb 26), and gabapentin is ongoing. The record states relief was "inadequate."
    *   *Met?* Yes.

*   **Criterion C (Function):** Is there a documented pain score of 5 or higher, or a functional limitation?
    *   *Analysis:* Yes. The pain score is 7/10, and there's a documented "functional limitation: limiting walking."
    *   *Met?* Yes.

So, the initial requirements for an epidural steroid injection are met.

**Repeat Injection Criteria (R1, R2, R3) - For subsequent injections:**

This is where the critical evaluation happens for this request.

*   **Criterion R1 (Relief from Prior Injection):** This is the core of repeat injection approval. The policy requires "at least 50 percent relief of pain for at least 6 weeks after the prior injection."
    *   *Analysis:* The record states the prior injection (2026-05-28) provided "approximately 30 percent relief lasting about three weeks."
    *   *Met?* **No.** This is a clear failure to meet the primary requirement for a repeat injection. 30% relief is significantly less than 50%, and 3 weeks is less than 6 weeks.

*   **Criterion R2 (Frequency):** No more than 3 injections in a rolling 12-month period.
    *   *Analysis:* This is the second injection requested. The prior one was on 2026-05-28. The current request is for 2026-07-16. This is well within the limit of 3 injections.
    *   *Met?* Yes.

*   **Criterion R3 (Timing):** No repeat injection within 14 days of a prior injection.
    *   *Analysis:* The prior injection was on 2026-05-28. The requested date is on or after 2026-07-16. This is much more than 14 days apart.
    *   *Met?* Yes.

**Exclusions (X1, X2, X3) - Contraindications:**

I quickly scan these to ensure there are no immediate disqualifiers.

*   **Exclusion X1 (Infection):** No active infection is reported.
    *   *Applies?* No.

*   **Exclusion X2 (Coagulopathy):** No anticoagulation issues are reported.
    *   *Applies?* No.

*   **Exclusion X3 (Axial Pain):** The pain is described as "radicular," not solely axial.
    *   *Applies?* No.

**Determining the Decision:**

Based on this thorough review, the request meets the initial criteria (A, B, C) and some of the repeat criteria (R2, R3). However, the explicit requirement of Criterion R1 for repeat injections—at least 50% pain relief for at least 6 weeks from the previous injection—is not met. The documented outcome of the prior injection falls significantly short of this policy requirement.

Therefore, my decision must be to **deny** this request.

**Identifying the Deciding Criteria:**

The single criterion that was not met, and is the sole reason for the denial of this repeat injection request, is **R1**.

**Formulating the Rationale:**

I need to articulate this clearly and concisely. The rationale should directly address the unmet criterion.

My rationale would be: "The request for a repeat injection is denied as the prior injection did not result in at least 50% pain relief for 6 weeks, which is required by the policy."

**Constructing the Final JSON:**

Now, I assemble these pieces into the required JSON format.

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The request for a repeat injection is denied as the prior injection did not result in at least 50% pain relief for 6 weeks, which is required by the policy."
}
```

I've considered all aspects, applied the policy meticulously, and arrived at a clear, actionable decision with the necessary justification. The information regarding the documentation for R1 (E1, E2, E3) is that the documentation *exists* and shows the criterion is *not met*, thus leading to a denial rather than a pended status for missing information.

Here's my thought process in analyzing this prior authorization request for a lumbar epidural steroid injection. As a health plan analyst, my primary goal is to meticulously apply our medical policy, MP-517, to the clinical information provided. I need to make a clear determination and articulate the reasoning precisely, outputting it in a structured JSON format with `decision`, `criteria`, and `rationale` keys.

First, I'll break down the policy itself. It has distinct sections for initial injections and repeat injections, along with exclusions and documentation requirements.

For **Initial Injections**, I'm looking for:
*   **A. INDICATION:** Does the patient have radicular pain in a dermatomal pattern, supported by imaging showing nerve root compression or foraminal stenosis?
*   **B. CONSERVATIVE THERAPY:** Has there been at least 4 weeks of conservative treatment (physical therapy and medications) with insufficient relief?
*   **C. FUNCTION:** Is the patient experiencing significant pain (score >= 5/10) or functional limitations?

For **Repeat Injections**, which is crucial for this request as it's specified as the "second injection," the criteria become:
*   **R1. RELIEF:** Did the prior injection provide at least 50% pain relief for a minimum of 6 weeks?
*   **R2. FREQUENCY:** Has the patient received no more than 3 injections within a rolling 12-month period?
*   **R3. TIMING:** Has at least 14 days passed since the prior injection?

There are also **Exclusions (X1, X2, X3)** and **Documentation Pends (E1, E2, E3)** to consider. Exclusions are clear reasons for denial. Pends are for missing information, which would lead to a request for more documentation before a decision can be made.

Now, let's scrutinize the details of this specific authorization request:

*   **Patient:** A 48-year-old.
*   **Request Type:** Transforaminal lumbar epidural steroid injection, left L4-L5. Importantly, this is for the **second injection**, so I'll focus on the repeat criteria (R1, R2, R3).

I'll go through the provided clinical information piece by piece, cross-referencing it with the policy:

1.  **History:**
    *   "Left L4 radicular pain": This aligns with policy criterion **A**.
    *   "Pain score 7/10": This satisfies policy criterion **C** (pain score >= 5/10).
    *   "Limiting walking": This also satisfies policy criterion **C** (functional limitation).

2.  **Imaging:**
    *   "MRI lumbar spine 2026-02-19. Report is submitted": This fulfills **E1** (imaging report submitted).
    *   "Shows left L4-L5 foraminal narrowing with nerve root contact": This strongly corroborates the radicular pain described and directly supports policy criterion **A**.

3.  **Conservative Care:**
    *   "PT from 2026-01-08 to 2026-02-26": This period is approximately 7 weeks, exceeding the required 4 weeks for policy criterion **B**.
    *   "Dates are provided": This satisfies **E2** (conservative therapy dates provided).
    *   "Gabapentin ongoing": This confirms pharmacologic therapy as part of conservative management, further supporting **B**.

4.  **Prior Injection Information (This is critical for a repeat request):**
    *   "Date: 2026-05-28." The current request date (implied to be after 2026-07-16, as per the history note date) is well over 14 days after the prior injection. This satisfies policy criterion **R3** (timing).
    *   "This is the second injection in the rolling 12-month period": This means the patient has not exceeded the limit of 3 injections, satisfying policy criterion **R2**.
    *   **Follow-up Note (2026-06-25):** This is the linchpin. It states, "approximately 30 percent relief lasting about three weeks, now back to baseline."
        *   Policy criterion **R1** requires "at least 50% pain relief for at least 6 weeks."
        *   The documented relief is **30%**, which is **less than 50%**.
        *   The documented duration of relief is "**about three weeks**," which is **less than 6 weeks**.
        *   Therefore, policy criterion **R1 is unequivocally NOT met**.

5.  **Exclusions:**
    *   No mention of systemic or local infection, so **X1** does not apply.
    *   No mention of anticoagulation issues, so **X2** does not apply.
    *   The pain is clearly described as radicular, not solely axial, so **X3** does not apply.

6.  **Documentation Status:**
    *   **E1** (imaging report) is submitted.
    *   **E2** (conservative therapy dates) are provided.
    *   **E3** (repeat injection relief/duration) is documented. The documentation *is* present, but the *content* of that documentation fails to meet the clinical requirement of R1. This is not a pend for missing information; it's a denial based on the provided information not meeting the policy standard.

**Decision Synthesis:**

The request is for a repeat injection. While several criteria are met – the initial indication (A), functional impairment (C), adequate conservative care (B), and the frequency and timing for a repeat injection (R2, R3) – the most crucial criterion for a repeat epidural steroid injection, **R1**, is not satisfied. The explicit documentation from the follow-up note states that the prior injection provided only 30% relief for approximately three weeks, falling short of the policy's requirement for at least 50% relief sustained for at least six weeks.

Based on this direct failure to meet policy criterion R1, the decision must be to **deny** the authorization request.

The key criterion driving this denial is **R1**.

The rationale needs to clearly articulate this specific failure. I'll phrase it concisely: "The request is denied because the documented relief from the prior injection does not meet the policy's requirement of at least 50% for at least 6 weeks." This is direct, accurate, and within typical length constraints.

Therefore, my output JSON will be constructed as follows:

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The request is denied because the documented relief from the prior injection does not meet the policy's requirement of at least 50% for at least 6 weeks."
}
```

Here's how I'm processing this prior authorization request for a lumbar epidural steroid injection, applying Medical Policy MP-517. My goal is to determine coverage based on the provided clinical information and the policy's requirements, ultimately producing a JSON output with my decision, the specific criteria involved, and the rationale behind my conclusion.

First, I've identified that this is a request for a *second* injection. This immediately signals that I need to pay close attention to the "REPEAT INJECTIONS" criteria. However, the policy is structured such that the criteria for an *initial* injection (A, B, and C) must be met *before* evaluating the repeat criteria. So, I'll start by assessing A, B, and C.

**Evaluating Initial Injection Criteria (A, B, C):**

*   **Criterion A: INDICATION**
    *   **Policy Requirement:** "radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms."
    *   **Clinical Information:** The patient presents with "Left L4 radicular pain." This directly addresses the "radicular pain" component.
    *   **Clinical Information:** An MRI from February 19, 2026, shows "left L4-L5 foraminal narrowing with nerve root contact." The requested injection is at the L4-L5 level, and the imaging finding is consistent with the patient's reported radicular symptoms at that specific level.
    *   **My Assessment for A:** Based on this, Criterion A is met.

*   **Criterion B: CONSERVATIVE THERAPY**
    *   **Policy Requirement:** "at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief."
    *   **Clinical Information:** The patient has undergone "Physical therapy from 2026-01-08 through 2026-02-26." This period is nearly 7 weeks, clearly exceeding the required 4 weeks.
    *   **Clinical Information:** The patient is also on "gabapentin ongoing," which is a form of pharmacologic therapy. The record indicates "inadequate relief" from these measures.
    *   **My Assessment for B:** Criterion B is met.

*   **Criterion C: FUNCTION**
    *   **Policy Requirement:** "a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living."
    *   **Clinical Information:** The patient reports a current pain score of "7 out of 10." This surpasses the minimum score of 5.
    *   **Clinical Information:** The pain is also "limiting walking," which is a clear functional limitation.
    *   **My Assessment for C:** Criterion C is met.

So far, all the initial requirements for an injection are satisfied. Now, I move on to the more critical part for this request: the repeat injection criteria.

**Evaluating Repeat Injection Criteria (R1, R2, R3):**

*   **Criterion R1: Repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.**
    *   **Clinical Information:** The prior injection was on May 28, 2026. A follow-up note dated June 25, 2026, states "approximately 30 percent relief lasting about three weeks, now back to baseline."
    *   **My Analysis for R1:** This is the crucial point. The documented pain relief was only 30%, which falls significantly short of the required 50%. Furthermore, the duration of relief was "about three weeks," not the required "at least 6 weeks." Therefore, Criterion R1 is **not met**. This is a definitive reason for denial.

*   **Criterion R2: No more than 3 injections in a rolling 12-month period.**
    *   **Clinical Information:** This is stated to be the "second injection." The prior injection was on May 28, 2026, and this request is for a service on or after July 16, 2026. This falls within the limit.
    *   **My Assessment for R2:** Criterion R2 is met.

*   **Criterion R3: No repeat injection within 14 days of a prior injection.**
    *   **Clinical Information:** The prior injection was May 28, 2026. The requested service date (July 16, 2026) is well over 14 days later.
    *   **My Assessment for R3:** Criterion R3 is met.

**Checking for Exclusions (X1, X2, X3):**

I also briefly reviewed the exclusions to ensure none apply.

*   **X1 (Infection):** The clinical information states "Infection: none."
*   **X2 (Coagulopathy/Anticoagulants):** The clinical information states "Anticoagulation: none."
*   **X3 (Axial Pain):** The pain is documented as "Left L4 radicular pain," which is not purely axial.

None of the exclusions are relevant in this case.

**Considering Documentation (E1, E2, E3):**

I've confirmed that the necessary documentation for the criteria reviewed is present, even though the content doesn't always support coverage.

*   **E1 (Imaging Report):** The MRI report was submitted.
*   **E2 (Conservative Therapy Dates):** The dates for physical therapy were provided.
*   **E3 (Relief/Duration for R1):** The follow-up note documenting the relief and its duration was provided. The issue isn't a lack of documentation, but rather that the *documented information* doesn't meet the policy's requirements for R1.

**Formulating the Final Decision:**

My analysis shows that while the initial injection criteria (A, B, C) and some repeat criteria (R2, R3) are met, the request definitively fails to meet **Criterion R1**. The prior injection did not achieve the minimum required pain relief (50%) for the specified duration (6 weeks). Because a key coverage criterion is not met, the decision must be to **deny** the prior authorization request.

The specific criterion that leads to this decision is R1.

The rationale will clearly state that the prior injection's documented effectiveness did not meet the policy's threshold for coverage of a repeat procedure.

Therefore, my output will be:

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The prior injection did not result in at least 50% pain relief for at least 6 weeks, as required by policy for a repeat procedure."
}
```

Let me analyze this prior authorization request against the medical policy MP-517.

The request is for a second injection (repeat injection), so I need to evaluate both the initial approval criteria (A, B, C) and the repeat injection criteria (R1, R2, R3).

**Initial criteria:**
A. INDICATION — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.
- Record shows: Left L4 radicular pain, MRI shows left L4-L5 foraminal narrowing with nerve root contact. This satisfies A.

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.
- Record shows: Physical therapy 2026-01-08 through 2026-02-26 (about 7 weeks), gabapentin ongoing. This satisfies B.

C. FUNCTION — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.
- Record shows: pain 7 out of 10, limiting walking. This satisfies C.

**Repeat injection criteria:**
R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.
- The follow-up note records "approximately 30 percent relief lasting about three weeks, now back to baseline."
- This does NOT meet R1. The relief was only 30% (not at least 50%) and lasted only 3 weeks (not at least 6 weeks).

R2. No more than 3 injections in a rolling 12-month period.
- This is the second injection in the 12-month period, so R2 is satisfied.

R3. No repeat injection within 14 days of a prior injection.
- Prior injection was 2026-05-28, this request is dated 2026-07-16, which is well beyond 14 days. R3 is satisfied.

**Exclusions:**
X1. Systemic infection or infection at the planned injection site.
- Record says none. No exclusion.

X2. Uncorrected coagulopathy or an anticoagulant that has not been held per the prescriber's protocol.
- Record says anticoagulation: none. No exclusion.

X3. Axial back pain without a radicular component.
- The pain is radicular (L4 radicular pain). No exclusion.

**Documentation requirements:**
E1. The imaging report relied on for A.
- MRI report is submitted. E1 is satisfied.

E2. Dates of the conservative therapy relied on for B.
- Dates are provided (2026-01-08 through 2026-02-26). E2 is satisfied.

E3. For a repeat injection, the documented relief and duration for R1.
- The follow-up note dated 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline." This documentation is present, but the values do NOT meet R1's requirements (at least 50% relief for at least 6 weeks).

**Decision:**
The initial criteria A, B, C are all met. The exclusions X1, X2, X3 do not apply. The documentation E1, E2, E3 are present (though E3 documents that the relief was insufficient).

However, R1 is not met. The patient had only 30% relief lasting about 3 weeks, which does not satisfy the requirement for at least 50% relief for at least 6 weeks.

So the decision is to **deny** based on R1 not being met.

The criteria that were not met: R1.

Wait, let me reconsider. The policy says:
- "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met."
- "REPEAT INJECTIONS: R1. A repeat injection requires at least 50 percent relief..."

So for a repeat injection, all of A, B, C, and R1, R2, R3 must be met (where applicable). R1 is not met because the relief was only 30% for 3 weeks.

The decision is **deny** because R1 is not met.

For a denial, I should list only the identifiers that were not met or the exclusions that applied. R1 is the criterion that was not met.

Let me also think about whether I should cite both R1 sub-requirements (50% relief AND 6 weeks duration). The policy says R1 is "A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection." It's a single criterion identifier R1. So I should cite R1.

The decision is "deny" with criteria ["R1"].

Rationale: The repeat injection does not meet R1 because the documented relief was approximately 30 percent lasting about three weeks, below the required 50 percent for at least six weeks.

The request is for a second (repeat) transforaminal lumbar epidural steroid injection, left L4-L5.
Policy MP-517 applies.

Check initial criteria (A, B, C):
A. Indication: Left L4 radicular pain, MRI shows left L4-L5 foraminal narrowing with nerve root contact. (Met)
B. Conservative therapy: PT 2026-01-08 to 2026-02-26 (>4 weeks) with inadequate relief, gabapentin ongoing. (Met)
C. Function: Pain score 7/10, limiting walking. (Met)

Check Repeat Injections (R1, R2, R3):
R1. Repeat injection requires at least 50% relief of pain for at least 6 weeks after prior injection.
Prior injection: 2026-05-28. Follow-up 2026-06-25: "approximately 30 percent relief lasting about three weeks".
This fails R1 (needs >=50% relief for >=6 weeks).

R2. No more than 3 injections in rolling 12-month period. (Met, this is the 2nd).
R3. No repeat within 14 days. Prior was 2026-05-28, current request is after 2026-06-25 (or 2026-07-16). >14 days. (Met).

Check Exclusions (X1, X2, X3):
X1. Infection: none.
X2. Anticoagulation: none.
X3. Axial back pain without radicular component: Has radicular pain.

Since R1 is affirmatively not met (30% relief for 3 weeks, instead of >=50% for >=6 weeks), the decision is DENY.
Criteria for denial: R1.

Let's double check R1 text: "R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection."
Record: "approximately 30 percent relief lasting about three weeks"
This is a clear denial based on R1.

Decision: deny
Criteria: ["R1"]
Rationale: The request is for a repeat injection, but the clinical record documents only 30 percent relief lasting three weeks after the prior injection, failing the requirement for at least 50 percent relief for 6 weeks.
Word count of rationale: 38 words. (Wait, let me make it shorter to be safe).
"The record documents only 30 percent pain relief lasting three weeks after the prior injection, which fails the requirement of at least 50 percent relief for a minimum of 6 weeks." (31 words).

Let's check the keys:
"decision": "deny"
"criteria": ["R1"]
"rationale": "The record documents only 30 percent pain relief lasting three weeks after the prior injection, failing the requirement of at least 50 percent relief for a minimum of 6 weeks."

Wait, what about the date of the request? History is 2026-07-16. Prior injection 2026-05-28. That's 49 days, so R3 is met.
R1 is the only one failed.

Rationale: "The member received only 30 percent pain relief lasting three weeks from the prior injection, which does not meet the requirement of at least 50 percent relief for at least 6 weeks." (32 words).

Let's review the required JSON format.
```json
{
  "decision": "deny",
  "criteria": [
    "R1"
  ],
  "rationale": "The member received only 30 percent pain relief lasting three weeks from the prior injection, which does not meet the requirement of at least 50 percent relief for at least 6 weeks."
}
```
All good.

The request is for a repeat lumbar epidural steroid injection (second injection).
Policy MP-517 applies.

Criteria to check:
A. INDICATION: radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression/foraminal stenosis at consistent level.
- Record: Left L4 radicular pain. MRI 2026-02-19 shows left L4-L5 foraminal narrowing with nerve root contact. (Met)

B. CONSERVATIVE THERAPY: at least 4 weeks of conservative management (PT and pharm) with inadequate relief.
- Record: PT 2026-01-08 through 2026-02-26 (approx 7 weeks) with inadequate relief; gabapentin ongoing. (Met)

C. FUNCTION: pain score >= 5/10 or functional limitation.
- Record: pain 7/10, limiting walking. (Met)

REPEAT INJECTIONS:
R1. Repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.
- Record: Prior injection 2026-05-28. Follow-up 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline".
- This affirmatively contradicts R1 (needs >=50% relief for >=6 weeks, but only got 30% for 3 weeks).

R2. No more than 3 injections in rolling 12 months.
- Record: Second injection. (Met)

R3. No repeat injection within 14 days of prior.
- Record: Prior 2026-05-28, current request around 2026-07-16 (or later). >14 days. (Met)

EXCLUSIONS:
X1. Infection - none.
X2. Coagulopathy/anticoagulant - none.
X3. Axial back pain without radicular - has radicular.

Since R1 is affirmatively not met (30% relief for 3 weeks, instead of >=50% for >=6 weeks), the decision is DENY.
Criteria not met: R1.

Let's double check R1 wording: "R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection."
Record: "approximately 30 percent relief lasting about three weeks"
This is a denial based on R1.

Decision: deny
Criteria: ["R1"]
Rationale: The record indicates the prior injection provided only 30 percent relief for three weeks, which fails to meet the requirement of at least 50 percent relief for six weeks.
Word count of rationale: 28 words. Under 40 words.

Check keys:
"decision": "deny"
"criteria": ["R1"]
"rationale": "The record indicates the prior injection provided only 30 percent relief for three weeks, failing to meet the requirement of at least 50 percent relief for six weeks." (28 words).

Let's refine rationale:
"The member's prior injection provided only 30 percent relief for three weeks, which affirmatively fails the requirement of at least 50 percent relief lasting at least 6 weeks." (28 words).

Perfect.
JSON output only.
```json
{
  "decision": "deny",
  "criteria": [
    "R1"
  ],
  "rationale": "The member's prior injection provided only 30 percent relief for three weeks, which affirmatively fails the requirement of at least 50 percent relief lasting at least 6 weeks."
}
```
Wait, let me just ensure no other criteria are unmet.
A: met.
B: met.
C: met.
R2: met (2nd injection).
R3: met (May 28 to July 16 is > 14 days).
X1, X2, X3: none apply.
E1, E2, E3: E3 is for pend if missing, but here it is present and affirmatively contradicts R1. So it's a deny, not a pend.

Everything looks correct.

The user wants a prior authorization decision based on the provided medical policy MP-517 and the authorization request.

Let's evaluate the criteria:
A. INDICATION: Left L4 radicular pain, corroborated by MRI (left L4-L5 foraminal narrowing with nerve root contact). Met.
B. CONSERVATIVE THERAPY: PT 2026-01-08 to 2026-02-26 (>4 weeks) with inadequate relief, gabapentin ongoing. Met.
C. FUNCTION: Pain score 7/10, limiting walking. Met.

REPEAT INJECTIONS (since it's the second injection):
R1. Requires at least 50% relief of pain for at least 6 weeks after prior injection.
Prior injection: 2026-05-28. Follow-up 2026-06-25: "approximately 30 percent relief lasting about three weeks".
This fails R1 (needs >= 50% relief for >= 6 weeks).
R2. No more than 3 injections in rolling 12 months. (Met, this is the 2nd).
R3. No repeat within 14 days. Prior was 2026-05-28, current request is after 2026-07-16 (history date). Met.

EXCLUSIONS:
X1. Infection: none.
X2. Anticoagulant: none.
X3. Axial back pain without radicular: has radicular.

Since R1 is affirmatively not met (30% relief for 3 weeks, instead of 50% for 6 weeks), the decision is DENY.

Criteria to list for denial: R1.

Rationale: The request is for a repeat injection, but the clinical record documents only 30 percent relief lasting three weeks, failing the requirement for at least 50 percent relief for 6 weeks.

Let's check the constraints:
decision: "deny"
criteria: ["R1"]
rationale: "The request is for a repeat injection, but the record documents only 30 percent relief lasting three weeks, failing the requirement of at least 50 percent relief for six weeks." (29 words).

Wait, the prompt says "at least 50 percent relief of pain for at least 6 weeks".
Record says "approximately 30 percent relief lasting about three weeks".
So R1 is not met.

Let's double check R1 identifier. "R1".
Decision: "deny"
Criteria: ["R1"]
Rationale: "The member is requesting a repeat injection but only experienced 30 percent relief for three weeks, which does not meet the requirement of 50 percent relief for at least 6 weeks." (31 words).

Is there any other criteria failed? No.
E3 is for pend, but here it's documented and fails, so it's a deny based on R1.

JSON format:
```json
{
  "decision": "deny",
  "criteria": [
    "R1"
  ],
  "rationale": "The member is requesting a repeat injection but only experienced 30 percent relief for three weeks, which does not meet the requirement of 50 percent relief for at least 6 weeks."
}
```
Word count of rationale: 31 words. Under 40 words.
Perfect.

Let me work through this case.

Request: Transforaminal lumbar epidural steroid injection, left L4-L5, second injection (repeat).

Policy MP-517:
- Approve a single diagnostic/therapeutic injection when A, B, C met.
- Repeat injections: R1 (≥50% relief for ≥6 weeks after prior), R2 (no more than 3 in rolling 12 months), R3 (no repeat within 14 days of prior).
- Exclusions X1-X3.
- Documentation E1-E3 pend items.

Initial criteria:
A. Indication — radicular pain in dermatomal distribution (left L4 radicular pain), corroborated by imaging showing nerve root compression or foraminal stenosis at consistent level. MRI shows left L4-L5 foraminal narrowing with nerve root contact. A is met.

B. Conservative therapy — at least 4 weeks of PT and pharmacologic therapy with inadequate relief. PT 2026-01-08 through 2026-02-26 (~7 weeks) with inadequate relief; gabapentin ongoing. B is met. Note: "gabapentin ongoing" — dates? The documentation section E2 says pend where otherwise approvable but record lacks dates of conservative therapy. PT dates are given. Pharmacologic therapy: gabapentin ongoing — is that sufficient? The policy says "at least 4 weeks of conservative management (physical therapy and pharmacologic therapy)". The record documents PT dates and states gabapentin ongoing. Hmm, does "ongoing" give dates? It doesn't give explicit dates for gabapentin, but "ongoing" as of the history date 2026-07-16 implies current use. The primary analysis here though — this is a repeat injection, so the deciding factor is R1.

C. Function — pain score 7/10, limiting walking. C is met.

Repeat injection requirements:
R1: Repeat injection requires at least 50% relief for at least 6 weeks after prior injection. The record: "approximately 30 percent relief lasting about three weeks, now back to baseline." 30% < 50%, and 3 weeks < 6 weeks. R1 is affirmatively NOT met. That's a denial.

R2: No more than 3 injections in rolling 12 months. Only one prior injection (2026-05-28). R2 met.

R3: No repeat within 14 days of prior. Prior was 2026-05-28; request ~2026-07-16 history. Well beyond 14 days. R3 met.

Exclusions: X1 no infection, X2 no anticoagulation, X3 radicular pain present (not axial alone). None apply.

Decision: deny, because R1 is affirmatively not met. The record affirmatively contradicts R1 (30% relief, 3 weeks — both below thresholds). This is a denial, not a pend.

Criteria to cite: only the identifiers that were not met — R1.

Rationale: Prior injection provided only ~30% relief for ~3 weeks, below the 50% for 6 weeks required for a repeat injection (R1).

The documentation section E3 (pend for repeat injection relief/duration) — the record DOES document relief and duration (30%, 3 weeks). So E3 documentation exists; it's just not sufficient. So no pend. Denial is correct.

Criteria: ["R1"].

Rationale (under 40 words): "R1 is not met: the prior injection yielded approximately 30 percent relief for about three weeks, below the required 50 percent relief for at least 6 weeks. All other criteria and exclusions are satisfied or inapplicable."

Word count: Let me count: "R1 is not met: the prior injection yielded approximately 30 percent relief for about three weeks, below the required 50 percent relief for at least 6 weeks." That's about 27 words. Good. Maybe trim the last sentence or keep it short. One or two sentences, under 40 words.

Final: 
```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The prior injection gave approximately 30 percent relief for about three weeks, affirmatively failing R1's requirement of at least 50 percent relief lasting at least 6 weeks; no exclusion applies."
}

Let me work through this case.

Request: Transforaminal lumbar epidural steroid injection, left L4-L5, second injection (repeat injection).

Policy MP-517:
- Approve a single diagnostic or therapeutic injection when A, B, C met.
- Repeat injections: R1 (at least 50% relief for at least 6 weeks after prior), R2 (no more than 3 in rolling 12 months), R3 (no repeat within 14 days of prior).
- Exclusions X1-X3.
- Documentation pend items E1-E3.

Initial criteria:
A. Indication — radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at consistent level. Record: left L4 radicular pain, MRI shows left L4-L5 foraminal narrowing with nerve root contact. Report submitted. A is met. (Note: foraminal narrowing = foraminal stenosis essentially; nerve root contact = compression. Met.)

B. Conservative therapy — at least 4 weeks of PT and pharmacologic therapy with inadequate relief. PT 2026-01-08 through 2026-02-26 — that's about 7 weeks (Jan 8 to Feb 26 is 49 days, ~7 weeks). Gabapentin ongoing (pharmacologic). Inadequate relief documented. B is met.

C. Function — pain score 7/10 documented, limiting walking. C is met.

Repeat injection requirements:
R1: At least 50% relief for at least 6 weeks after prior injection. Record: prior injection 2026-05-28; follow-up note 2026-06-25 records approximately 30% relief lasting about three weeks. This is affirmatively NOT met — 30% < 50%, and 3 weeks < 6 weeks. So R1 fails.

R2: No more than 3 injections in rolling 12-month period. This would be the second injection in the rolling 12 months (May 2026 and now July 2026). R2 is met.

R3: No repeat within 14 days of prior injection. Prior was 2026-05-28; request is 2026-07-16 (history date), which is more than 14 days. R3 is met.

Exclusions:
X1: No infection. Not applicable.
X2: No anticoagulation. Not applicable.
X3: Radicular pain present, not axial alone. Not applicable.

Decision: DENY because R1 is affirmatively not met (30% relief for 3 weeks vs required 50% for 6 weeks).

Criteria: list only the identifiers that were not met — R1.

Rationale: Repeat injection criterion R1 not met; documented relief was approximately 30% lasting about three weeks, below the required 50% relief for at least 6 weeks.

Output format: JSON with decision, criteria (array), rationale (under 40 words).

Rationale: "Prior injection on 2026-05-28 produced only approximately 30 percent relief for about three weeks, failing R1's requirement of at least 50 percent relief lasting at least 6 weeks." That's about 27 words. Good.

Criteria: ["R1"].

Let me work through this case.

Requested service: Transforaminal lumbar epidural steroid injection, left L4-L5, **second injection** — so this is a repeat injection. Repeat injection criteria R1, R2, R3 apply.

R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.

Prior injection: 2026-05-28. Follow-up note 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline."

30% relief < 50% required, and three weeks < 6 weeks. So R1 is affirmatively NOT met. That's a denial.

R2. No more than 3 injections in a rolling 12-month period. Only one prior injection (2026-05-28), so this would be the second — R2 is met.

R3. No repeat injection within 14 days of a prior injection. Request history dated 2026-07-16, prior injection 2026-05-28 — well over 14 days. R3 is met.

Exclusions:
X1. Systemic infection or infection at injection site — none. Not applicable.
X2. Uncorrected coagulopathy or anticoagulant not held — none. Not applicable.
X3. Axial back pain without radicular component — no, this is radicular pain in dermatomal distribution (left L4 radicular pain). Not applicable.

Initial criteria:
A. Indication — radicular pain, corroborated by imaging showing nerve root compression or foraminal stenosis at a consistent level. Left L4 radicular pain; MRI shows left L4-L5 foraminal narrowing with nerve root contact. Met.
B. Conservative therapy — at least 4 weeks of PT and pharmacologic therapy with inadequate relief. PT 2026-01-08 through 2026-02-26 = ~7 weeks, gabapentin ongoing, inadequate relief. Met.
C. Function — pain score 7/10, limiting walking. Met.

Documentation items E1 (imaging report submitted), E2 (conservative therapy dates provided), E3 (relief and duration documented) — all present, but for a denial we don't pend.

So the decision is deny because R1 is affirmatively not met: only ~30% relief for ~3 weeks, versus required ≥50% relief for ≥6 weeks.

Criteria for denial: list only the identifiers that were not met or exclusions that applied. So criteria: ["R1"].

Rationale: The record affirmatively documents only ~30% relief for ~3 weeks after the 2026-05-28 injection; R1 requires ≥50% relief for ≥6 weeks.

Decision: "deny". Criteria: ["R1"]. Rationale one or two sentences under 40 words.

Rationale draft: "Repeat injection criterion R1 is not met: the follow-up note documents only approximately 30 percent relief lasting about three weeks, versus the required at least 50 percent relief for at least 6 weeks."

Word count: Let me count: "Repeat injection criterion R1 is not met: the follow-up note documents only approximately 30 percent relief lasting about three weeks, versus the required at least 50 percent relief for at least 6 weeks." — approximately 33 words. Good, under 40.

Output JSON:
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "..."
}

Let me work through this case carefully.

Policy MP-517, lumbar epidural steroid injection. Request: transforaminal lumbar ESI, left L4-L5, second injection — so this is a repeat injection. Repeat injection criteria R1-R3 apply.

Check A (indication): Left L4 radicular pain in dermatomal distribution, MRI 2026-02-19 report shows left L4-L5 foraminal narrowing with nerve root contact — imaging corroborates at a consistent level. A met.

Check B (conservative therapy): PT 2026-01-08 through 2026-02-26 (~7 weeks) with inadequate relief; gabapentin ongoing. At least 4 weeks of PT and pharmacologic therapy. B met.

Check C (function): pain score 7/10 ≥ 5, and functional limitation (limiting walking). C met.

Repeat injections:
- R1: requires at least 50% relief for at least 6 weeks after prior injection. The follow-up note documents ~30% relief lasting about three weeks, back to baseline. This affirmatively contradicts R1 — documented relief is 30%, below the 50% threshold, and duration 3 weeks < 6 weeks. So R1 is affirmatively NOT met → DENIAL, not a pend. The record addresses R1 and shows it fails.
- R2: no more than 3 injections in rolling 12 months. This would be the second injection, first was 2026-05-28. Within 12 months: only 1 prior. R2 not violated.
- R3: no repeat within 14 days of prior injection. Prior 2026-05-28, request is around 2026-07-16 (history date). Well over 14 days. R3 fine.

Exclusions:
- X1: infection none. Not applicable.
- X2: anticoagulation none. Not applicable.
- X3: axial pain without radicular component — here there's radicular pain. Not applicable.

So decision: deny. The criterion not met: R1. The record affirmatively documents 30% relief for ~3 weeks, which is below the 50%/6-week threshold. This is an affirmative contradiction, so deny, not pend.

Note: E3 says pend for missing documented relief and duration for R1 "where otherwise approvable." But here the documentation is present and shows failure — so it's a denial, not a pend. That distinction is exactly what the harness tests.

Criteria array for denial: only identifiers not met or exclusions applied. That's ["R1"].

Rationale: under 40 words. Something like: "Second injection at same level; documented relief after prior injection was 30% for about three weeks, failing R1's 50%-relief-for-6-weeks requirement. A, B, C, R2, R3 are satisfied and no exclusion applies."

That's a bit long but under 40 words. Let me count: "Second injection at same level; documented relief after prior injection was 30% for about three weeks, failing R1's 50%-relief-for-6-weeks requirement. A, B, C, R2, R3 are satisfied and no exclusion applies." Count: Second(1) injection(2) at(3) same(4) level(5) documented(6) relief(7) after(8) prior(9) injection(10) was(11) 30%(12) for(13) about(14) three(15) weeks(16) failing(17) R1's(18) 50%-relief-for-6-weeks(19) requirement(20) A(21) B(22) C(23) R2(24) R3(25) are(26) satisfied(27) and(28) no(29) exclusion(30) applies(31). 31 words, fine. But maybe trim. "Documented relief after the 2026-05-28 injection was approximately 30% for three weeks, below R1's requirement of at least 50% relief for at least 6 weeks. Other criteria and exclusions are satisfied." That's ~32 words. Fine.

Decision: "deny". Criteria: ["R1"].

Output only one fenced JSON block.

Let me work through this case.

Policy MP-517 — Lumbar Epidural Steroid Injection.

Request: Transforaminal lumbar ESI, left L4-L5, second injection (repeat injection).

Initial criteria (A, B, C) — do these apply for a repeat injection? The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then REPEAT INJECTIONS R1-R3. The question is whether A, B, C must also be met for a repeat injection. The structure suggests A/B/C govern approval generally, and R1-R3 add repeat requirements. The history: radicular pain left L4, imaging corroborates (MRI 2026-02-19 report: left L4-L5 foraminal narrowing with nerve root contact) — A met. Conservative therapy: PT 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing — B met (4+ weeks: Jan 8 to Feb 26 is ~7 weeks). C: pain score 7/10, limiting walking — met.

Now repeat injection criteria:
- R1: requires at least 50% relief for at least 6 weeks after prior injection. The follow-up note: ~30% relief lasting about three weeks, now back to baseline. This affirmatively contradicts R1 — relief was only 30% and only 3 weeks. So R1 is NOT met — this is a denial, not a pend. E3 (documentation of relief and duration for R1) is present — the record documents relief and duration, and it fails the criterion.
- R2: no more than 3 injections in rolling 12 months — this is the second; fine.
- R3: no repeat within 14 days of prior injection — prior 2026-05-28, request ~2026-07 (history dated 2026-07-16); more than 14 days. Fine.

Exclusions: X1 infection none; X2 anticoagulation none; X3 radicular pain present, not axial. None apply.

So decision: deny. Criteria: R1 only (criteria not met). The record affirmatively contradicts R1 (30% relief < 50%, 3 weeks < 6 weeks).

Should I list A, B, C in criteria? Instructions: "For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met." So criteria = ["R1"].

Rationale: under 40 words, one or two sentences. Something like: "The follow-up note documents approximately 30% relief lasting three weeks, which affirmatively fails R1's requirement of at least 50% relief for at least 6 weeks after the prior injection. A, B, C, R2, R3 are met; no exclusions apply."

Wait — rationale should be under 40 words. Let me draft: "Repeat injection fails R1: documented relief after the 2026-05-28 injection was approximately 30 percent for three weeks, below the required 50 percent relief sustained for at least 6 weeks. All other criteria and exclusions are satisfied."

Count words: Repeat(1) injection(2) fails(3) R1(4) documented(5) relief(6) after(7) the(8) 2026-05-28(9) injection(10) was(11) approximately(12) 30(13) percent(14) for(15) three(16) weeks(17) below(18) the(19) required(20) 50(21) percent(22) relief(23) sustained(24) for(25) at(26) least(27) 6(28) weeks(29). All(30) other(31) criteria(32) and(33) exclusions(34) are(35) satisfied(36). 36 words. Fine.

Output JSON only, one fenced code block.

We need answer JSON only. Need apply policy MP-517 Lumbar epidural steroid injection. Request: transforaminal lumbar epidural steroid injection left L4-L5, second injection. Need determine decision, criteria, rationale.

Let's parse policy carefully.

Policy effective 2026-01-01.
APPROVE a single diagnostic or therapeutic injection when A, B, and C are met.

A. INDICATION — radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with symptoms.

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.

C. FUNCTION — documented pain score of 5 or higher out of 10, OR documented functional limitation affecting ADLs.

REPEAT INJECTIONS:
R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after prior injection.
R2. No more than 3 injections in a rolling 12-month period.
R3. No repeat injection within 14 days of a prior injection.

EXCLUSIONS — deny if any apply:
X1 systemic infection or infection at planned injection site.
X2 uncorrected coagulopathy or anticoagulant not held per protocol.
X3 axial back pain without radicular component. Injections for axial pain alone not covered.

DOCUMENTATION — pend where otherwise approvable but record lacks:
E1. The imaging report relied on for A.
E2. Dates of the conservative therapy relied on for B.
E3. For a repeat injection, the documented relief and duration for R1.

Now request details:
Member 48. Service: transforaminal lumbar epidural steroid injection, left L4-L5, second injection.
History 2026-07-16: Left L4 radicular pain, currently 7 out of 10, limiting walking.
Imaging: MRI lumbar spine 2026-02-19, report submitted: left L4-L5 foraminal narrowing with nerve root contact.
Conservative care: PT 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing.
Prior injection: 2026-05-28, same level and side. Follow-up note dated 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline".
Anticoagulation: none. Infection: none.

Need apply to repeat injection. The policy says APPROVE a single diagnostic or therapeutic injection when A, B, C are met. For repeat injections, R1-R3 apply. Is this a repeat injection? Yes: second injection, prior injection 2026-05-28 same level and side. Need see R1: requires at least 50 percent relief of pain for at least 6 weeks after prior injection. Record: prior injection 2026-05-28, follow-up note 2026-06-25 (28 days later? Actually May 28 to Jun 25 is 28 days, about 4 weeks). It records approximately 30 percent relief lasting about three weeks, now back to baseline. That is less than 50 percent relief and less than 6 weeks (3 weeks < 6 weeks). So R1 not met. Does that lead to denial? The policy: "REPEAT INJECTIONS: R1. A repeat injection requires at least 50 percent relief..." If requirement is affirmatively not met, deny. It is not a documentation pend issue because documentation for R1 is present (follow-up note documents relief and duration), but it fails the substantive 50%/6 weeks requirement. The documentation item E3 says: "For a repeat injection, the documented relief and duration for R1." That's about lacking documented relief/duration; here documented relief and duration are present, but they are insufficient (30%, 3 weeks). So not pend; deny because R1 not met. Also check R3: no repeat within 14 days of prior injection. Prior injection 2026-05-28, current request presumably? Wait request history dated 2026-07-16. Need date of requested service? Not explicitly given. The clinical record history on 2026-07-16 describes current pain. The prior injection was 2026-05-28. Request presumably after 2026-07-16? The requested service is second injection. We don't have date of service. The follow-up note 2026-06-25 is 4 weeks after prior injection; as of 2026-07-16, it's 7 weeks and 1 day? Let's compute: May 28 to July 16. May has 31 days. From May 28 to May 31 = 3 days. June 30 days = 33, July 16 = 49 days? Wait 3 + 30 = 33, plus 16 = 49 days. That is 7 weeks? 49 days /7 = 7 weeks exactly? Let's check: May 28 + 7 days = Jun 4, +14=Jun11, +21=Jun18, +28=Jun25, +35=Jul2, +42=Jul9, +49=Jul16. Yes exactly 49 days = 7 weeks. So request date maybe 2026-07-16 or after. R3: at least 14 days since prior injection. It's 49 days, so R3 met if service after July 12. History date 2026-07-16. So R3 presumably met (assuming requested on/after 2026-07-16). Even if not, R1 failure is enough.

R2: No more than 3 injections in rolling 12-month period. This is second injection, so within limit. Met.

Exclusions: X1 infection none. X2 anticoagulation none (none). X3 axial back pain without radicular component. The history is left L4 radicular pain, imaging shows foraminal narrowing with nerve root contact, so radicular; not axial alone. So exclusions not applicable.

Now need determine whether base A, B, C met. Since it's a repeat injection, do we still require A, B, C? The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met. REPEAT INJECTIONS: R1..." It implies repeat injections are also injections and must meet A, B, C plus R1-R3? The policy structure: first sentence says approve a single injection when A, B, C met. Then "REPEAT INJECTIONS:" lists additional requirements for repeat injections. It doesn't explicitly say A-C required for repeat, but logically yes: it's still an injection. However, if we deny on R1, do we need to cite criteria? The instruction: "For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met." So if we deny because R1 not met, we list ["R1"] only. Do we also need to consider if any exclusion applies? No. Do we need to list A, B, C if they were met? No, for denial list only identifiers not met or exclusions applied. So criteria array = ["R1"].

But wait: Is R1 a requirement that is affirmatively not met? Yes, the follow-up note documents approximately 30% relief lasting about three weeks. That is less than 50% and less than 6 weeks. So R1 not met. Decision = deny.

Need check if R1 is a "repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection." The follow-up note dated 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline." It is after prior injection, documents relief and duration. It fails both numeric thresholds. Affirmatively not met. Deny.

Potential nuance: The request is for "second injection." The prior injection was 2026-05-28. The follow-up note is 2026-06-25, which is 28 days after injection. It records 30% relief lasting about three weeks, now back to baseline. Wait if relief lasted about three weeks, it started after injection (maybe a few days?) and ended around June 18? The note on June 25 says now back to baseline. Regardless, duration approximately 3 weeks, less than 6 weeks. Percent 30% < 50%. So R1 fails.

Check documentation pend: E3 is for missing documented relief and duration for R1. Here documented relief and duration are present (the note), so no pend. The content fails R1. So deny.

Check if A, B, C met? Let's verify to ensure no other denial. A: radicular pain left L4, imaging MRI shows left L4-L5 foraminal narrowing with nerve root contact. Yes radicular pain dermatomal? Left L4 radicular pain, imaging consistent. Report submitted. A met. B: conservative therapy: PT 2026-01-08 through 2026-02-26. That's from Jan 8 to Feb 26. Duration: Jan 8 to Feb 8 = 31 days? Let's calculate: Jan 8 to Jan 31 is 23 days? Wait Jan has 31 days, so 31-8 = 23 days remaining in Jan (Jan 9-31 inclusive? Actually from Jan 8 through Feb 26: Jan 8 to Feb 8 is 31 days (Jan 8 to Feb 8: Jan has 31 days, so Jan 8 + 31 = Feb 8). Then Feb 8 to Feb 26 = 18 days. Total 49 days, about 7 weeks. So at least 4 weeks. Pharmacologic: gabapentin ongoing (so pharmacologic therapy). Inadequate relief: PT with inadequate relief; also pain currently 7/10. B met. C: pain score 7 out of 10 (documented in history 2026-07-16: currently 7 out of 10), which is >=5. Also functional limitation limiting walking. So C met. So base criteria met.

R2: second injection in rolling 12 months, <=3, met. R3: prior injection 2026-05-28, request/history 2026-07-16 is 49 days later, >14 days, so met (assuming service not before 2026-06-11; if service requested on 2026-07-16, yes). If requested service date not provided? Wait the authorisation request does not include a date of service. The history is dated 2026-07-16. The request is presumably as of that date or later. There's no scheduled date given. Is there insufficient info to assess R3? The task says dates are ISO; we have prior injection date 2026-05-28 and history date 2026-07-16. The requested service is "second injection." Usually the authorisation request date is around the history date? The request itself has no explicit service date. But do we need service date to evaluate R3? R3: No repeat injection within 14 days of a prior injection. If the service will be performed sometime after authorization, the earliest possible date is maybe the date of request/history? Since prior injection was May 28, 14 days later is June 11. The history/request is July 16, which is after June 11. Unless the service was performed earlier? But it's a prospective authorization request? The history note is 2026-07-16, so any injection after that is >14 days. So it's fine. We don't have a service date, but we have a clinical encounter dated 2026-07-16; authorizations are requested before service; the service would be after 2026-07-16, thus >14 days. There's no indication it's within 14 days. So R3 met. Even if not, we wouldn't pend because R3 isn't a documentation item? Actually R3 is a requirement; if the record didn't have date of service, would that be a pend? The documentation section only lists E1, E2, E3. R3 is a requirement; if record silent on service date? But we know prior injection date and history date, so not silent. So R3 satisfied.

Now check X2: Anticoagulation: none. So no anticoagulant. X2 not apply. X1: Infection: none. X3: not axial alone. So exclusions no.

Thus decision = deny. Criteria = ["R1"] only. Wait, do we need to include R1 only, or also maybe note that it's a repeat injection and R1 not met. The policy identifiers: R1. Yes.

But let's read the instruction: "For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met." If an exclusion applies, list exclusion like X1 etc. Here no exclusion. The identifier not met is R1. Should we list "R1" as string. Yes.

Wait, is R1 a requirement or a "repeat injection" criterion? It says "R1. A repeat injection requires at least 50 percent relief..." It is a requirement. It is not in the documentation section; it's a clinical requirement. The record affirmatively shows 30% for 3 weeks. So not met. Deny.

Check if there is any possibility that decision should be "pend" under E3? E3: "For a repeat injection, the documented relief and duration for R1." Documentation section says: "pend where otherwise approvable but the record lacks: ... E3. For a repeat injection, the documented relief and duration for R1." The record does NOT lack documented relief and duration; it has them: follow-up note records relief (30%) and duration (about three weeks). So E3 is not missing. The fact that the documented relief fails the 50%/6 weeks threshold means R1 not met, which is a denial, not a pend. The task description: "A requirement that the record affirmatively contradicts is a DENIAL. A requirement the record simply does not address, where the policy lists it as a documentation item, is a PEND." Here the record addresses relief/duration (documented), and contradicts R1 (30%<50%; 3 weeks<6 weeks). So DENIAL, pend not appropriate. Good.

Now rationale: one or two sentences, under 40 words. Need state: Prior injection 2026-05-28 follow-up documents only ~30% relief for ~3 weeks, less than the required 50% relief for at least 6 weeks under R1; therefore repeat injection is denied. Must be under 40 words. Let's draft: "This is a repeat injection; the 2026-06-25 follow-up documents only about 30% relief for about 3 weeks after the 2026-05-28 injection, failing R1’s requirement of at least 50% relief for at least 6 weeks. Denied." Count words: This(1) is(2) a(3) repeat(4) injection;(5) the(6) 2026-06-25(7) follow-up(8) documents(9) only(10) about(11) 30%(12) relief(13) for(14) about(15) 3(16) weeks(17) after(18) the(19) 2026-05-28(20) injection,(21) failing(22) R1’s(23) requirement(24) of(25) at(26) least(27) 50%(28) relief(29) for(30) at(31) least(32) 6(33) weeks.(34) Denied.(35) Actually hyphenated dates maybe one word? Doesn't matter, under 40. Good.

Need ensure JSON format exactly one fenced JSON code block and nothing else. The keys: "decision", "criteria", "rationale". decision string exactly one of "approve", "deny", "pend", "not_applicable". So "deny". criteria array of strings: ["R1"]. rationale string.

Let's double-check if there is any other requirement not met that should be listed. For a denial, list only identifiers that were not met or exclusions that applied. Did A, B, C met? Yes. Did R2 met? Yes. Did R3 met? Yes. Did X apply? No. So only R1. But wait: Is R1 the only repeat requirement? R1 not met. What about the fact that the policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then repeat injections have R1-R3. If R1 fails, deny. No need to list A, B, C. Good.

Check if we need to cite R1 and maybe E3? No, E3 is documentation missing; not missing. Do not list E3. The instruction: "For a pend, list only the documentation identifiers that are missing." For deny, list identifiers not met. R1 is not a documentation identifier, it's a requirement. So ["R1"].

Potential nuance: The request is for "Transforaminal lumbar epidural steroid injection". The policy is "LUMBAR EPIDURAL STEROID INJECTION". Transforaminal is a type of epidural injection. So policy governs. Not not_applicable.

Need maybe mention laterality/level: left L4-L5, prior injection same level and side. So repeat. Good.

Check the conservative therapy dates: PT 2026-01-08 through 2026-02-26. Did it say pharmacologic therapy? Gabapentin ongoing. Yes. Inadequate relief: PT with inadequate relief, pain still 7/10. B met.

C: Pain score 7/10 documented on 2026-07-16. Yes. Or functional limitation limiting walking. Both present.

Imaging report submitted: MRI 2026-02-19 report submitted: left L4-L5 foraminal narrowing with nerve root contact. A met. Also E1 imaging report relied on for A is present (report submitted). No pend.

Infection: none. Anticoagulation: none. So exclusions X1, X2 not apply. X3: radicular pain present, imaging confirms foraminal stenosis/nerve root contact. So not axial alone. No exclusion.

Therefore decision deny.

Let's make sure output JSON valid:
```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "This is a repeat injection; the 2026-06-25 follow-up documents only about 30% relief for about 3 weeks after the 2026-05-28 injection, failing R1’s requirement of at least 50% relief for at least 6 weeks. Denied."
}
```
Check rationale length: maybe 36 words. Good. Use straight apostrophe? JSON string can contain ’ (unicode) but better use ASCII to avoid parsing? JSON allows Unicode. But to be safe, use "R1's" with straight apostrophe '. Let's use "R1's". Draft: "This is a repeat injection; the 2026-06-25 follow-up documents only about 30% relief for about 3 weeks after the 2026-05-28 injection, failing R1's requirement of at least 50% relief for at least 6 weeks. Denied." Word count: This(1) is(2) a(3) repeat(4) injection;(5) the(6) 2026-06-25(7) follow-up(8) documents(9) only(10) about(11) 30%(12) relief(13) for(14) about(15) 3(16) weeks(17) after(18) the(19) 2026-05-28(20) injection,(21) failing(22) R1's(23) requirement(24) of(25) at(26) least(27) 50%(28) relief(29) for(30) at(31) least(32) 6(33) weeks.(34) Denied.(35). Good.

Wait: Should the rationale mention that no pend because documented? It's fine. Keep under 40 words.

Let's ensure the requested JSON keys only. No extra keys. Output exactly fenced JSON block. No preamble. Use ```json ... ```.

One more check: The prior injection date: 2026-05-28. Follow-up note dated 2026-06-25. That is 28 days later, which is 4 weeks. The note says "now back to baseline". If relief lasted about three weeks, 3 weeks < 6 weeks. R1 requires at least 6 weeks. It fails. Also percent 30% < 50%. So affirmative contradiction.

What about R2: "No more than 3 injections in a rolling 12-month period." This is second injection, so count = 2, which is not more than 3. Met.

R3: No repeat injection within 14 days. The prior injection 2026-05-28; the current request is second injection. The history is 2026-07-16, but we don't have a scheduled date. If the authorization is being requested on 2026-07-16, service will be later, >14 days. If the service was already done? It says requested service, so prospective. So R3 met. No issue.

Thus final answer.

We need answer JSON only. Need apply policy MP-517. Let's parse.

Policy: Approve single diagnostic or therapeutic injection when A, B, C met. But request is second injection (repeat). Repeat injections: R1 requires at least 50 percent relief of pain for at least 6 weeks after prior injection. R2 no more than 3 in rolling 12 months (second, likely okay). R3 no repeat injection within 14 days of prior injection. Prior injection date 2026-05-28. Request? Authorisation request presumably current date? History date 2026-07-16. The request submitted maybe around 2026-07-16. Interval from 2026-05-28 to 2026-07-16 is 49 days (May 28 to Jul 16: May remaining 3 days (29,30,31) + June 30 + July 16 = 49 days). More than 14 days. R3 satisfied. R2: second injection within rolling 12 months, only second, so no more than 3 satisfied.

R1: prior injection 2026-05-28 same level and side. Follow-up note 2026-06-25: approx 30% relief lasting about three weeks, now back to baseline. R1 requires at least 50 percent relief for at least 6 weeks after prior injection. This is affirmatively documented as 30% relief lasting 3 weeks. That fails R1. It's an affirmative contradiction / not met. So repeat injection denies due to R1. The policy: REPEAT INJECTIONS: R1. A repeat injection requires... Since requirement not met. Decision deny. For denial, list only identifiers not met or exclusions applied. Not list met criteria. Criteria: ["R1"]. Could also include R3? No, R3 met. R2 met. Need maybe if it's a repeat injection, the approval requires all A,B,C and repeat rules. Since R1 not met, deny. The criteria list should be only R1.

But wait, is there any initial injection approval criteria? Since this is second injection, repeat rules apply. But does the policy require A, B, C for repeat as well? It says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then "REPEAT INJECTIONS:" R1-R3. Typically repeat injection is still an injection, so still must meet A, B, C? The policy structure: Approve a single... when A, B, and C are met. Repeat injections: additional criteria R1-R3. If repeat doesn't meet R1, deny. Since R1 failed, we don't need evaluate A, B, C. But maybe we should consider if A, B, C are met: A radicular pain left L4, imaging left L4-L5 foraminal narrowing with nerve root contact consistent. B conservative therapy PT 2026-01-08 to 2026-02-26 (7 weeks) with inadequate relief; gabapentin ongoing. C pain 7/10 limiting walking. So A, B, C are met. But denial list only R1.

Need check exclusions: X1 infection none, X2 anticoag none, X3 axial back pain without radicular component - not applicable, radicular pain present. So no exclusion.

Documentation pend? E1 imaging report submitted (yes). E2 dates of conservative therapy provided (yes). E3 for repeat injection, documented relief and duration for R1: The record has documented relief and duration (30% relief lasting three weeks). Wait E3 says pend where otherwise approvable but record lacks: For repeat injection, the documented relief and duration for R1. Here the record does NOT lack the documented relief/duration; it has it, but it's insufficient (30%/3 weeks vs required 50%/6 weeks). This is not missing documentation; it's a documented failure to meet R1. The distinction: "A requirement that the record affirmatively contradicts is a DENIAL. A requirement the record simply does not address, where the policy lists it as a documentation item, is a PEND." The record addresses relief/duration: 30% for 3 weeks. That affirmatively contradicts R1 requirement (at least 50% for at least 6 weeks). So denial, not pend. Criteria R1.

Decision: "deny". Rationale: one or two sentences, under 40 words. Explain repeat injection fails R1 because prior injection yielded only ~30% relief for ~3 weeks, less than required ≥50% for ≥6 weeks. Need keep under 40 words. Let's draft: "Repeat injection denied under R1: after the 2026-05-28 prior injection, documented relief was only about 30% for about three weeks, less than the required at least 50% relief lasting at least six weeks." Count words: Repeat(1) injection(2) denied(3) under(4) R1:(5) after(6) the(7) 2026-05-28(8) prior(9) injection,(10) documented(11) relief(12) was(13) only(14) about(15) 30%(16) for(17) about(18) three(19) weeks,(20) less(21) than(22) the(23) required(24) at(25) least(26) 50%(27) relief(28) lasting(29) at(30) least(31) six(32) weeks.(33) Under 40. Good.

Need ensure JSON keys: decision, criteria, rationale. criteria array of strings: ["R1"].

Check if R2/R3 identifiers: R2 satisfied, R3 satisfied. Should we list R1 only. Yes.

But let's think carefully: The policy effective 2026-01-01. Requested service second injection. Prior injection 2026-05-28, follow-up 2026-06-25 says back to baseline. Date of request? History 2026-07-16. Interval >14 days. Rolling 12-month period: only second injection. R2: "No more than 3 injections in a rolling 12-month period." Since this would be second, it's fine. R3: "No repeat injection within 14 days of a prior injection." Request date unknown but history 2026-07-16 likely more than 14 days after 2026-05-28. 49 days. Fine.

Now, what about the possibility that the prior injection may not have been prior authorized/approved under this policy? Not relevant. The policy says repeat injection requires at least 50% relief... The record includes follow-up note with relief/duration. So R1 not met. Deny.

Now check criteria identifiers exact: "R1". The policy writes "R1. A repeat injection requires..." So cite "R1". Good.

Potential nuance: The request is for "second injection" - is it a repeat injection per policy? Yes, prior injection same level and side on 2026-05-28. So repeat injection rules apply.

What about A, B, C? For approval of any injection, A, B, C must be met. Since R1 fails, we deny. The denial criteria list only R1. The instructions: "For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met." So yes only R1. Exclusions none applied.

Could there be an argument that because it's a repeat injection, and the prior injection follow-up is within 6 weeks? Wait prior injection 2026-05-28, follow-up note 2026-06-25 is 28 days after (4 weeks). It records relief lasting about three weeks, now back to baseline. That is before 6 weeks. R1 requires at least 50% relief of pain for at least 6 weeks after prior injection. The documented duration is three weeks; back to baseline at 4 weeks. So definitely fails. Not pend for E3 because relief/duration are documented, just insufficient.

Could the decision be "pend" because the follow-up note is dated 2026-06-25, which is before 6 weeks post injection, so the 6-week duration hasn't fully elapsed? Wait careful: Prior injection 2026-05-28. Six weeks after is 2026-07-09 (May 28 + 42 days = July 9). The follow-up note is 2026-06-25 (4 weeks post), documenting three weeks relief and now back to baseline. By 2026-06-25, the patient is already back to baseline, so relief did not last 6 weeks. The record affirmatively states relief lasted about three weeks and now back to baseline. So at the time of the note, it's known that relief did not persist to 6 weeks. It is not silent on whether relief persisted to 6 weeks; it says it stopped and returned to baseline by 4 weeks. Therefore affirmatively contradicts R1. The request date is 2026-07-16 (after 6 weeks), but the follow-up note from 2026-06-25 documents the course. It says "approximately 30 percent relief lasting about three weeks, now back to baseline". That means relief ended at ~3 weeks, so no 50% for 6 weeks. Denial.

Could there be a pend for E3 if the record lacked duration? It doesn't lack; it has duration (3 weeks). So not pend.

Let's also consider if "criteria" should include something like "R1" only, or maybe "R1" and maybe "E3"? No, E3 is a documentation pend item. Since not pend, not listed. For denial, only not met identifiers. R1 not met. Could there be any other not met? Let's test A, B, C. A: radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at level consistent. History: Left L4 radicular pain. Imaging: left L4-L5 foraminal narrowing with nerve root contact. Consistent. A met. B: at least 4 weeks conservative management (PT and pharmacologic) with inadequate relief. PT 2026-01-08 through 2026-02-26 = 7 weeks. Gabapentin ongoing (pharmacologic). Inadequate relief. B met. C: documented pain score 5+ out of 10 or functional limitation affecting ADLs. Pain 7/10 limiting walking. Met. R2: No more than 3 injections in rolling 12 months. This is second. Met. R3: no repeat within 14 days of prior. Prior 05-28, request ~07-16, 49 days. Met. Exclusions X1 none, X2 none, X3 axial back pain without radicular component - no, radicular. So only R1 fails.

Now ensure output format: exactly one fenced JSON code block and nothing else. Inside, object with keys decision, criteria, rationale. Use double quotes. No trailing commas. Rationale string with no newline? We can include in one line. Ensure under 40 words. Let's refine rationale to be one or two sentences, under 40 words.

Option: "Denied under R1. After the 2026-05-28 injection, the record documents only about 30% relief lasting about three weeks, not the required at least 50% relief for at least six weeks." Count: Denied(1) under(2) R1.(3) After(4) the(5) 2026-05-28(6) injection,(7) the(8) record(9) documents(10) only(11) about(12) 30%(13) relief(14) lasting(15) about(16) three(17) weeks,(18) not(19) the(20) required(21) at(22) least(23) 50%(24) relief(25) for(26) at(27) least(28) six(29) weeks.(30) 30 words. Good. Two sentences? Actually one sentence? "Denied under R1." then second sentence. Combined? It's two sentences. Under 40 words. Good.

But maybe we should state "repeat injection" to be clear. "Repeat injection denied under R1: after the 2026-05-28 prior injection, the record documents only about 30% relief lasting about three weeks, not the required at least 50% relief for at least six weeks." Count: Repeat(1) injection(2) denied(3) under(4) R1:(5) after(6) the(7) 2026-05-28(8) prior(9) injection,(10) the(11) record(12) documents(13) only(14) about(15) 30%(16) relief(17) lasting(18) about(19) three(20) weeks,(21) not(22) the(23) required(24) at(25) least(26) 50%(27) relief(28) for(29) at(30) least(31) six(32) weeks.(33) Good.

Check JSON null? Not needed.

One more nuance: The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then "REPEAT INJECTIONS: R1. A repeat injection requires at least 50 percent relief..." Does a repeat injection also need A, B, C? Typically yes, because it's still an injection, but the policy heading says "REPEAT INJECTIONS" and lists R1-R3. If the repeat fails R1, deny. Suppose someone argues that A, B, C are met and R1 not met, so deny based on R1. Good.

Could it be "not_applicable"? No, policy governs lumbar epidural steroid injection, requested transforaminal lumbar ESI. It's applicable.

Could decision be "pend" because the follow-up note is dated 2026-06-25, which is before the 6-week mark, and the request is 2026-07-16, but there is no note after 6 weeks confirming whether relief persisted? Wait re-read: "The follow-up note dated 2026-06-25 records 'approximately 30 percent relief lasting about three weeks, now back to baseline'." That explicitly says relief lasted about three weeks and now (as of 2026-06-25) back to baseline. The 6-week mark is 2026-07-09. If the note says at 4 weeks post-injection (2026-06-25) the patient is back to baseline after 3 weeks relief, then it is documented that relief did NOT last 6 weeks. There is no ambiguity. It is not silent; it affirmatively says relief ended. So not pend.

Also check E3 documentation: "For a repeat injection, the documented relief and duration for R1." If the record lacked relief/duration, pend. But it has them. So not pend.

Thus final answer JSON.

Need ensure no markdown outside block. The final answer should be:

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "Repeat injection denied under R1: after the 2026-05-28 prior injection, the record documents only about 30% relief lasting about three weeks, not the required at least 50% relief for at least six weeks."
}
```

Check rationale punctuation: It has a colon and comma. JSON string can contain colon and comma. Fine. Under 40 words? Let's recount carefully with the exact string:
"Repeat injection denied under R1: after the 2026-05-28 prior injection, the record documents only about 30% relief lasting about three weeks, not the required at least 50% relief for at least six weeks."

Words:
1 Repeat
2 injection
3 denied
4 under
5 R1:
6 after
7 the
8 2026-05-28
9 prior
10 injection,
11 the
12 record
13 documents
14 only
15 about
16 30%
17 relief
18 lasting
19 about
20 three
21 weeks,
22 not
23 the
24 required
25 at
26 least
27 50%
28 relief
29 for
30 at
31 least
32 six
33 weeks.

33 words. Good. Under 40.

One more check: Should criteria be ["R1"] or ["R1", "R2", "R3"]? No, denial lists only not met. R1 not met. R2 and R3 met. So only R1.

Double-check R2: "No more than 3 injections in a rolling 12-month period." This is the second injection. Prior was 2026-05-28. Request in 2026-07. Rolling 12 months includes only these two. So it's <=3. Met. If request were for third, still maybe met if only two prior? Actually no more than 3 means up to 3 allowed. Second is fine.

Double check R3: "No repeat injection within 14 days of a prior injection." Prior 2026-05-28. Request history 2026-07-16. 49 days. Met. If request date not given explicitly except History (2026-07-16). Authorization request likely submitted on/around that date. It's clearly not within 14 days. So met.

Now, should we mention in rationale that R2 and R3 are met? No, only one or two sentences. We don't need. Just state denial under R1.

Potential issue: The decision "deny" because R1 is not met. Could the prior injection have been performed elsewhere and not under this plan? Doesn't matter; policy says prior injection. It was prior.

Another nuance: R1 says "at least 50 percent relief of pain for at least 6 weeks after the prior injection." The record documents "approximately 30 percent relief lasting about three weeks, now back to baseline". This is both <50% and <6 weeks. So clearly fails.

Let's prepare final. Must output exactly one fenced JSON code block and nothing else. Ensure no text before/after. Use ```json ... ```. Good.

We need answer prior auth task. Need apply policy MP-517 Lumbar epidural steroid injection. Need output JSON with decision, criteria (array strings), rationale string.

Let's parse request and policy carefully.

Policy: MP-517 effective 2026-01-01. Approve a single diagnostic or therapeutic injection when A, B, C are met.

A. INDICATION — radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with symptoms.

B. CONSERVATIVE THERAPY — at least 4 weeks conservative management (PT and pharmacologic therapy) with inadequate relief.

C. FUNCTION — documented pain score 5+ out of 10, or documented functional limitation affecting ADLs.

REPEAT INJECTIONS:
R1. Repeat injection requires at least 50 percent relief of pain for at least 6 weeks after prior injection.
R2. No more than 3 injections in rolling 12-month period.
R3. No repeat injection within 14 days of prior injection.

EXCLUSIONS — deny if any apply:
X1 systemic infection or infection at site.
X2 uncorrected coagulopathy or anticoagulant not held per prescriber protocol.
X3 axial back pain without radicular component. Injections for axial pain alone not covered.

DOCUMENTATION — pend where otherwise approvable but record lacks:
E1 imaging report relied on for A.
E2 dates of conservative therapy relied on for B.
E3 for repeat injection, documented relief and duration for R1.

We must decide.

Request: 48-year-old. Requested service: Transforaminal lumbar epidural steroid injection, left L4-L5, second injection.

History 2026-07-16: Left L4 radicular pain, currently 7/10, limiting walking.
Imaging: MRI lumbar spine 2026-02-19, report submitted: left L4-L5 foraminal narrowing with nerve root contact.
Conservative care: PT 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing.
Prior injection: 2026-05-28, same level/side. Follow-up note 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline".
Anticoagulation: none. Infection: none.

Need classify as repeat injection. It's second injection. Need satisfy A, B, C and repeat criteria R1, R2, R3. Also no exclusions. Documentation pend if missing items.

Let's check each.

Indication A: radicular pain in dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at level consistent. History: Left L4 radicular pain. Imaging MRI 2026-02-19: left L4-L5 foraminal narrowing with nerve root contact. Is that consistent? Left L4 radicular pain vs left L4-L5 foraminal narrowing with nerve root contact. Foraminal narrowing at L4-L5 typically affects L4 nerve root? Let's consider anatomy: At L4-L5 level, the traversing nerve root is L5? Wait, in lumbar spine, nerve roots exit through neural foramina below corresponding pedicle. For example, L4 nerve root exits through the L4-L5 foramen? Actually the intervertebral foramen is formed by pedicles of vertebra above and below, named for the level: L4-L5 foramen transmits the L4 nerve root? Let's recall: The L4 nerve root exits via the L4-L5 intervertebral foramen. The L5 nerve root exits via L5-S1 foramen. Yes: A disc herniation at L4-L5 typically compresses the traversing L5 root? Wait, common: L4-L5 disc herniation usually affects L5 nerve root (traversing root to exit at L5-S1). Actually there is confusion: A posterolateral disc herniation at L4-L5 often compresses the L5 root (since the L5 root traverses the lateral recess at L4-L5 and exits at L5-S1). The exiting L4 root at L4-L5 foramen is more affected by foraminal stenosis at L4-L5. Here imaging is foraminal narrowing with nerve root contact at left L4-L5. That corresponds to L4 nerve root (exiting root) because foraminal narrowing affects the exiting root, which at L4-L5 is L4 root. The policy says radicular pain in dermatomal distribution corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with symptoms. The request is left L4 radicular pain, and foraminal narrowing at left L4-L5. That seems consistent: left L4 radicular pain, left L4-L5 foraminal stenosis. It doesn't have to be exact same label? The level consistent: L4 radicular pain corresponds to L4-L5 foraminal narrowing (exiting L4 root). So A met. Imaging report submitted, so E1 satisfied (documentation requirement for imaging report relied on for A is present; not missing).

Conservative therapy B: at least 4 weeks of conservative management (PT and pharmacologic therapy) with inadequate relief. Here PT 2026-01-08 through 2026-02-26 (that's about 7 weeks) with inadequate relief; gabapentin ongoing. Pharmacologic therapy ongoing (gabapentin). Need dates of conservative therapy relied on for B: documentation item E2. The record includes dates for PT (2026-01-08 through 2026-02-26) and gabapentin ongoing (no date started? "gabapentin ongoing" indicates current but no start date). Are dates of conservative therapy relied on for B documented? Policy says: E2. Dates of the conservative therapy relied on for B. The record gives PT dates 2026-01-08 through 2026-02-26. It says gabapentin ongoing, but no start date or dates. Does that mean dates of pharmacologic therapy missing? Let's parse B: at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief. The conservative management must include PT and pharmacologic therapy. The record has PT dates and inadequate relief. Pharmacologic: gabapentin ongoing; no dates, no inadequate relief specific? It says conservative care: PT ... with inadequate relief; gabapentin ongoing. It doesn't explicitly state inadequate relief from pharmacologic? The semicolon: "Physical therapy 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing." This likely means gabapentin is ongoing but does it meet pharmacologic therapy? It doesn't say inadequate relief with pharmacologic, but combined conservative therapy with inadequate relief is stated for PT. However the record may be sufficient for B? Need consider documentation item E2: dates of conservative therapy relied on for B. For PT, dates are given. For gabapentin, no dates. Is pharmacologic therapy part of conservative therapy relied on for B, and its dates missing? If so, should pend for E2? Let's read B: "at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief." That means conservative management includes both PT and pharmacologic therapy. To satisfy B, need documentation of 4 weeks of both? The policy's documentation says pend where otherwise approvable but record lacks E2 Dates of the conservative therapy relied on for B. The record includes dates for physical therapy but not for gabapentin (just "ongoing"). Does "dates" plural refer to the period of conservative therapy (including PT and pharmacologic)? If the pharmacologic therapy start date or duration is missing, then E2 missing? Let's assess.

The conservative care section: "Physical therapy 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing." Gabapentin ongoing means the member is currently taking gabapentin, but no initiation date, no duration. To know if there was at least 4 weeks of pharmacologic therapy (or concurrent with PT for 4 weeks), we need dates. The therapy was PT from Jan 8 to Feb 26 (7 weeks). Gabapentin ongoing as of July 16 presumably, but when did it start? It may have started recently or during PT? "gabapentin ongoing" suggests continued pharmacologic therapy but no dates. Documentation item E2 requires dates of conservative therapy relied on for B. If the clinician is relying on gabapentin as part of conservative therapy, the dates are missing. But is gabapentin actually required to be dated? B says pharmacologic therapy. Gabapentin is a pharmacologic therapy. To demonstrate at least 4 weeks of conservative management (PT and pharmacologic therapy), one might rely on the combination. The PT dates are provided, but the pharmacologic dates are not. Since E2 says "Dates of the conservative therapy relied on for B" - if the record lacks dates for the pharmacologic component, then it's missing and should pend, unless the pharmacologic therapy is not being relied upon? It says "gabapentin ongoing" so it's part of conservative care. However, maybe the conservative therapy relied on for B is the PT with inadequate relief, and gabapentin ongoing is mentioned but not necessarily the 4-week component? Wait, B requires conservative management (physical therapy and pharmacologic therapy). Both must be present for at least 4 weeks? It says "at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief." This is ambiguous: It could mean at least 4 weeks of conservative management, which consists of PT and pharmacologic therapy (i.e., both modalities during that time). The record: PT 1/8-2/26 (7 weeks) with inadequate relief; gabapentin ongoing. If gabapentin started before or during PT and continued, that would satisfy. But the only dates for conservative therapy (PT) are given. Pharmacologic dates missing. The documentation requirement E2: "Dates of the conservative therapy relied on for B." Since the record provides dates for physical therapy, but not gabapentin, does that mean E2 missing? Let's keep in mind.

C. FUNCTION: documented pain score of 5 or higher out of 10, or functional limitation affecting ADLs. History currently 7 out of 10, limiting walking. 7/10 meets pain score >=5. Also limiting walking is functional limitation. So C met.

Repeat injection criteria:
R1: Repeat injection requires at least 50 percent relief of pain for at least 6 weeks after prior injection.
Prior injection 2026-05-28. Follow-up note 2026-06-25 (4 weeks later) records approximately 30 percent relief lasting about three weeks, now back to baseline. That is 30% relief, less than 50%, and lasted 3 weeks, less than 6 weeks. So R1 is NOT met. This is an affirmative contradiction: record affirmatively documents 30% relief for 3 weeks. R1 requires at least 50% relief for at least 6 weeks. Since the follow-up note says 30% relief lasting about three weeks, R1 fails. This is a requirement affirmatively not met. Per instructions: "A requirement that the record affirmatively contradicts is a DENIAL." The record affirmatively says 30% relief for 3 weeks, which contradicts/negates R1 (needs >=50% and >=6 weeks). Therefore we DENY based on R1. It's not a pend because E3: For a repeat injection, documented relief and duration for R1. Wait, documentation E3 says pend where otherwise approvable but record lacks the documented relief and duration for R1. Here the record actually HAS documented relief and duration: "approximately 30 percent relief lasting about three weeks". So it's not lacking; it's documented but insufficient (30%, 3 weeks). Therefore it's an affirmative failure of R1, not a pend for missing documentation. So decision = deny. Criteria: list only identifiers not met or exclusions that applied. That would be ["R1"] since R1 not met. Do we also list any exclusion? Let's check exclusions: X1 infection none (no). X2 anticoagulation none (no). X3 axial back pain without radicular component: history says left L4 radicular pain, so radicular component present, not axial alone. So no exclusion applies.

But wait, there is also repeat injection definition: Is this a "single diagnostic or therapeutic injection" or repeat? It's second injection, so repeat. Need meet A, B, C and R1-R3. Let's check R2 and R3: R2 no more than 3 injections in rolling 12-month period. This is second injection, prior 2026-05-28, current request 2026-07-16? Actually request date? History date 2026-07-16. The authorization request date maybe 2026-07-16. Second injection: prior May 28, 2026. So within 12 months there have been 1 prior; this would be 2nd, less than 3. R2 met (not a denial). R3: no repeat injection within 14 days of prior injection. Prior injection 2026-05-28; current request 2026-07-16 is about 49 days later (May 28 to July 16: May 28 to May 31 = 3 days? Let's calculate: May has 31 days. From May 28 to May 31 inclusive? Usually days between: May 29,30,31 = 3 days, then June 30 days, then July 16 days = 49 days total? Let's do: May 28 to June 28 = 31 days (since May 28 to May 31 is 3, plus June 1-28 is 28 => 31? Wait: date difference: May 28 to June 28 is 31 days because May has 31 days: 31 - 28 = 3 days remaining in May (29,30,31) then June 28 is 28 days, total 31. Actually from May 28 to June 28 is exactly 31 days (one month). Then June 28 to July 16 is 18 days (June 28 to June 30 is 2, plus July 16 = 18? Let's compute: June 28 -> June 30 = 2 days (29,30); July 1-16 = 16 days; total 18. So total 31+18 = 49 days. Yes >14 days. R3 met.

So the only failed requirement is R1. Decision: deny. Criteria: ["R1"].

But let's verify whether maybe it's a pend for E3? Let's examine policy documentation: "E3. For a repeat injection, the documented relief and duration for R1." The follow-up note dated 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline". This is documented relief (30%) and duration (three weeks). So E3 is satisfied in that the record has the documented relief and duration. However, the relief and duration do not meet R1 threshold. The policy says pend where otherwise approvable but record lacks E3. Since the record has it (it's just inadequate), the lack is not there. The instruction: "A requirement that the record affirmatively contradicts is a DENIAL. A requirement the record simply does not address, where the policy lists it as a documentation item, is a PEND." Here R1 is a requirement, not a documentation item? Actually R1 is a repeat injection requirement. E3 is the documentation item for R1. The record addresses R1 by providing relief and duration, but the values are insufficient. Is that "affirmatively contradicts" R1? R1 requires at least 50% relief for at least 6 weeks. The record says ~30% relief for ~3 weeks. That's an affirmative statement that relief was 30% (less than 50) for 3 weeks (less than 6). It affirmatively shows the condition is not met. It's not silent. So deny.

Wait: Is R1 a requirement that needs to be satisfied? Yes: "R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection." The record says 30% for 3 weeks. That is not meeting R1. So deny.

Now B: Need check if B is met? If B not met, would be another denial? Let's see if we need to include B? For a denial, list only the identifiers that were not met or exclusions that applied. The instruction says: "For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met." If multiple are not met, list all not met. We need be sure if B is not met or maybe documentation missing E2 leading to pend? But since we already deny on R1, we must decide if B is met or not, or if missing E2. If there is a missing E2, would the correct decision be pend instead of deny? Let's evaluate carefully: The decision algorithm: "approve" every requirement satisfied; "deny" a requirement affirmatively not met, or exclusion applies; "pend" the record is silent on something the policy's documentation section says to pend for, and nothing else defeats the request. Key: If there is both a denial (R1 not met) and a missing documentation (E2 missing), the decision is deny, because a requirement is affirmatively not met (R1). Pend is only when "nothing else defeats the request". Since R1 defeats it (affirmatively not met), we deny, not pend, even if E2 also missing. But wait, the instruction: "A requirement that the record affirmatively contradicts is a DENIAL. A requirement the record simply does not address, where the policy lists it as a documentation item, is a PEND. That distinction is scored." So if E2 is missing (dates of pharmacologic therapy), that's a pend item, but because R1 is an affirmative denial, the overall decision is deny, and criteria should list R1 only? The criteria for denial: list only identifiers that were not met or exclusions applied. Do we list E2? No, E2 is a documentation item, not a requirement not met. If B is not met because dates missing? Wait, B is a requirement. If the dates are missing, does that mean B is not documented, i.e., the record does not address the pharmacologic dates? B requires at least 4 weeks conservative management (PT and pharmacologic therapy). The record provides PT dates and says gabapentin ongoing. The dates of gabapentin are not provided. That means the record is silent on the dates of pharmacologic therapy. Is the pharmacologic therapy dates a documentation item E2? Yes: E2 dates of the conservative therapy relied on for B. If the record lacks dates for the pharmacologic therapy, then E2 is missing, which is a pend item. But is B itself affirmatively not met? The record is not silent on conservative therapy altogether; it provides PT dates and inadequate relief. It says gabapentin ongoing, which indicates pharmacologic therapy is present, but no dates. Does B require dates? The requirement B itself is "at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief." It doesn't expressly require documentation of dates as part of the requirement; it's a clinical requirement. The policy's documentation section says pend where otherwise approvable but record lacks E2 dates of conservative therapy relied on for B. So if the record lacks dates for pharmacologic therapy, we would pend for E2 (if otherwise approvable). But it's not otherwise approvable because R1 fails. So decision = deny, criteria = R1 only. But we must be absolutely sure R1 is the only not met requirement, and that A, B, C, R2, R3 are met (or at least not affirmatively not met). Let's scrutinize A, B, C, R2, R3.

A: Indication: radicular pain dermatomal distribution, imaging showing nerve root compression or foraminal stenosis at level consistent. History: Left L4 radicular pain. Imaging: left L4-L5 foraminal narrowing with nerve root contact. This is foraminal stenosis (narrowing) at L4-L5. Level consistent? Left L4 radicular pain is served by left L4 nerve root, which exits at left L4-L5 foramen. So yes. Also imaging report submitted, so E1 satisfied. No issue.

B: Conservative therapy: PT 2026-01-08 to 2026-02-26 (that's 50 days? Jan 8 to Feb 26: Jan 8 to Jan 31 = 23 days, plus Feb 26 = 26? Actually from Jan 8 to Feb 26 inclusive? Let's compute duration: Jan 8 to Feb 8 = 31 days (Jan has 31 days: 31-8+? Let's do: Jan 8 to Jan 31 = 23 days (since 31-8=23, but if starting on 8th, days of therapy: 8,9,...31 = 24 days? Wait: 31 - 8 + 1 = 24 days in Jan if inclusive. Then Feb 1-26 inclusive = 26 days. Total 50 days. That's about 7 weeks. At least 4 weeks satisfied. With inadequate relief documented. Pharmacologic therapy: gabapentin ongoing. The record doesn't give a start date. The member is 48, radicular pain, gabapentin is a pharmacologic therapy. The requirement is conservative management (PT and pharmacologic therapy). It doesn't say pharmacologic must be 4 weeks, just conservative management at least 4 weeks, and it includes PT and pharmacologic therapy. Usually gabapentin ongoing implies current use, but to have conservative management include pharmacologic therapy, one needs to know they were on it during the 4-week period. However, "gabapentin ongoing" as of 2026-07-16 indicates they have been on it at least since some time before, but no dates. The documentation item E2 asks for dates of conservative therapy relied on for B. The PT dates are provided; the gabapentin dates are not. If we rely on gabapentin as part of conservative therapy, dates missing. But maybe the conservative therapy relied on for B is just the PT? Wait B says "physical therapy and p

We need to apply the medical policy MP-517 to the given authorization request. Let's parse the policy and the request.

Policy: 
APPROVE a single diagnostic or therapeutic injection when A, B, and C are met.

A. INDICATION — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.

C. FUNCTION — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.

REPEAT INJECTIONS:
R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.
R2. No more than 3 injections in a rolling 12-month period.
R3. No repeat injection within 14 days of a prior injection.

EXCLUSIONS:
X1. Systemic infection or infection at the planned injection site.
X2. Uncorrected coagulopathy or an anticoagulant that has not been held per the prescriber's protocol.
X3. Axial back pain without a radicular component. Injections for axial pain alone are not covered under this policy.

DOCUMENTATION — pend where otherwise approvable but the record lacks:
E1. The imaging report relied on for A.
E2. Dates of the conservative therapy relied on for B.
E3. For a repeat injection, the documented relief and duration for R1.

Now, the request details:
Member: 48-year-old.
Requested service: Transforaminal lumbar epidural steroid injection, left L4-L5, second injection.

History (2026-07-16): Left L4 radicular pain, currently 7 out of 10, limiting walking. → This addresses radicular pain, pain score 7/10, functional limitation (limiting walking).

Imaging: MRI lumbar spine 2026-02-19, report submitted: left L4-L5 foraminal narrowing with nerve root contact. → This addresses A: imaging showing foraminal narrowing (foraminal stenosis) with nerve root contact at level consistent with symptoms.

Conservative care: Physical therapy 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing. → This addresses B: at least 4 weeks (Jan 8 to Feb 26 is >4 weeks), conservative management (PT and pharmacologic). Inadequate relief documented.

Prior injection: 2026-05-28, same level and side. The follow-up note dated 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline". → This is a repeat injection (second injection). We need to evaluate R1, R2, R3.

R1: requires at least 50% relief for at least 6 weeks after prior injection. The record says ~30% relief lasting about three weeks. This does NOT meet R1. R1 is a requirement for repeat injection. Since it is not met, the request should be denied.

Also need to check other criteria.
A: met.
B: met.
C: met (pain 7/10 and functional limitation).
Exclusions: none (no infection, no anticoagulation, radicular component present).
R2: No more than 3 injections in rolling 12-month. This is second injection, so fine.
R3: No repeat within 14 days of prior. Prior was 2026-05-28, current request date not explicitly given but presumably after. The request note is dated 2026-07-16. Prior injection 2026-05-28. That's >14 days. So R3 met.

But R1 is not met. The policy says "A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection." The record says 30% relief lasting about three weeks. This is an affirmative failure of R1. Therefore decision is "deny". Criteria: R1 (the one not met). Rationale should be brief.

We also need to see if there are any documentation issues. Since the record actually contains the follow-up note, E3 is not missing; it's present but shows insufficient relief. So the record is not silent; it affirmatively contradicts the requirement. Therefore it's a denial, not a pend.

Thus:
decision: "deny"
criteria: ["R1"]
rationale: "The prior injection provided only 30 percent relief for three weeks, failing the requirement of at least 50 percent relief for six weeks."

Check word count: under 40 words. Let's count: "The prior injection provided only 30 percent relief for three weeks, failing the requirement of at least 50 percent relief for six weeks." That's 18 words. Good.

Make sure we include only required keys: decision, criteria, rationale. No extra keys.

Decision string exactly "deny". Criteria array of strings. Rationale string.

Double-check if any other unmet criteria. X3? No, radicular pain. X1, X2? None. So only R1.

One nuance: The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." For repeat injections, the R criteria apply. So the criteria that decide the case are R1 (not met). Should we also list the ones that were met? No, for a denial, list only the identifiers that were not met or the exclusions that applied. So just ["R1"].

Make sure the JSON format is exactly as requested.

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The prior injection provided only 30 percent relief for three weeks, failing the requirement of at least 50 percent relief for six weeks."
}
```

That's it. No preamble, no extra text.

 We need to parse the policy and the request.

Policy: MP-517 Lumbar Epidural Steroid Injection.

We need to decide: approve, deny, pend, not_applicable.

Requested service: Transforaminal lumbar epidural steroid injection, left L4-L5, second injection.

Policy requires A, B, C for a single diagnostic or therapeutic injection.

Repeat injections have additional requirements R1, R2, R3.

Exclusions X1, X2, X3.

Documentation requirements E1, E2, E3.

Let's examine each.

A. INDICATION — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.

Record: Left L4 radicular pain (dermatomal distribution). Imaging: MRI lumbar spine 2026-02-19, report submitted: left L4-L5 foraminal narrowing with nerve root contact. So A is met. Imaging report is submitted, so E1 (imaging report relied on) is present.

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.

Record: Physical therapy 2026-01-08 through 2026-02-26. That's about 7 weeks (Jan 8 to Feb 26). Inadequate relief. Pharmacologic therapy: gabapentin ongoing. So B is met. Dates of conservative therapy are present, so E2 is satisfied.

C. FUNCTION — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.

Record: currently 7 out of 10, limiting walking. So C is met.

Now, it's a second injection. So repeat injection criteria apply.

R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.

Prior injection: 2026-05-28. Follow-up note 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline". So relief is 30% (<50%) and duration about three weeks (<6 weeks). R1 is NOT met. This is an affirmative contradiction (the record says 30% relief, three weeks). So this is a denial reason.

R2. No more than 3 injections in a rolling 12-month period. This is the second injection, so R2 is satisfied (only 2 so far).

R3. No repeat injection within 14 days of a prior injection. Prior injection was 2026-05-28. Request date? The request is presumably now (history dated 2026-07-16). So time elapsed is about 7 weeks (May 28 to July 16). So >14 days. R3 satisfied.

Exclusions: X1 none. X2 none. X3: axial back pain without radicular component. Not the case; radicular pain present.

Documentation: E1, E2 present. E3: For a repeat injection, the documented relief and duration for R1. The record does document relief and duration (30% relief, three weeks). So E3 is actually satisfied because the documentation exists; it's just that the values don't meet the threshold. The policy says "pend where otherwise approvable but the record lacks: E3. For a repeat injection, the documented relief and duration for R1." Since the record has it, it's not a pend. The requirement R1 itself is not met, leading to denial.

So decision: deny.

Criteria: For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met.

The unmet criterion is R1. Are there any others? R2 and R3 are met. A, B, C are met. No exclusions apply. So criteria array should contain ["R1"].

Rationale: one or two sentences, under 40 words. Need to explain that the prior injection did not provide at least 50% relief for 6 weeks.

Example: "The member did not achieve at least 50 percent pain relief for six weeks after the prior injection, failing repeat criterion R1."

Count words: The(1) member(2) did(3) not(4) achieve(5) at(6) least(7) 50(8) percent(9) pain(10) relief(11) for(12) six(13) weeks(14) after(15) the(16) prior(17) injection,(18) failing(19) repeat(20) criterion(21) R1.(22) That's 22 words. Good.

We need to ensure exactly one fenced JSON block.

Keys: decision, criteria, rationale.

Decision: "deny".
Criteria: ["R1"].
Rationale: string.

Check formatting: plain number with two decimals if money, but no money here. Dates are ISO if needed, not needed.

So final JSON:

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The member did not achieve at least 50 percent pain relief for six weeks after the prior injection, failing repeat criterion R1."
}
```

Double-check the instructions: "For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met." So only R1.

Pend vs Deny: The record is not silent on R1; it affirmatively states 30% relief for about three weeks. So it's a denial, not a pend.

Everything looks good.

We need to output a JSON object with keys "decision", "criteria", "rationale".

We have medical policy MP-517 for lumbar epidural steroid injection.

The request is for a transforaminal lumbar epidural steroid injection, left L4-L5, second injection.

Let's analyze the policy criteria:

APPROVE a single diagnostic or therapeutic injection when A, B, and C are met.

A. INDICATION — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.

History: Left L4 radicular pain. Imaging: MRI lumbar spine 2026-02-19, report submitted: left L4-L5 foraminal narrowing with nerve root contact. This satisfies A.

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.

Physical therapy 2026-01-08 through 2026-02-26. That's about 7 weeks. Gabapentin ongoing. Inadequate relief. So B is satisfied.

C. FUNCTION — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.

History: currently 7 out of 10, limiting walking. So C is satisfied.

Now it's a second injection. So repeat injection criteria apply:

R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.

Prior injection: 2026-05-28. Follow-up note 2026-06-25: "approximately 30 percent relief lasting about three weeks, now back to baseline". This does NOT meet R1 (needs >=50% relief for >=6 weeks). So R1 is not met.

R2. No more than 3 injections in a rolling 12-month period. It's the second injection, so R2 is fine.

R3. No repeat injection within 14 days of a prior injection. Prior injection was 2026-05-28, request date not explicitly given but history date is 2026-07-16, presumably request is around that time. It's well beyond 14 days. So R3 is fine.

Exclusions: X1, X2, X3. None apply.

Since R1 is a requirement for repeat injections and is not met, the decision should be "deny".

Criteria to list: For a denial, list only the identifiers that were not met or the exclusions that applied. Do not list the criteria that were met.

So we list R1 because it was not met. Should we list anything else? R2 and R3 are met. A, B, C are met. Exclusions don't apply. So only R1.

Rationale: one or two sentences, under 40 words. Must explain why.

"The prior injection provided only 30 percent relief for three weeks, failing the requirement of at least 50 percent relief for six weeks." That's 19 words. Good.

Double-check: The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." For repeat injections, it says R1, R2, R3. So for a repeat injection to be approved, A, B, C, R1, R2, R3 must all be met? The structure implies yes. Since R1 is not met, denial.

Is there any pend? The documentation for R1 is present (follow-up note). So no pend.

Decision: deny.

Criteria: ["R1"]

Rationale: "The prior injection provided only 30 percent relief for three weeks, failing the required at least 50 percent relief for six weeks." (20 words)

Check word count: The, prior, injection, provided, only, 30, percent, relief, for, three, weeks,, failing, the, required, at, least, 50, percent, relief, for, six, weeks. 22 words. Under 40.

Make sure JSON format is correct. Exactly one fenced JSON code block. No extra keys.

Also note: The prompt says "Reply with exactly one fenced JSON code block and nothing else."

Keys: "decision", "criteria", "rationale".

decision is string: "deny".

criteria is array of strings: ["R1"].

rationale is string.

Let's ensure no extra whitespace or commentary outside the block.

Also check if there is any nuance: The request says "second injection". The policy says "REPEAT INJECTIONS: R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection." The record says approximately 30 percent relief lasting about three weeks. That is an affirmative contradiction of R1. So denial is correct, not pend.

Final JSON:

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "The prior injection provided only 30 percent relief for three weeks, failing the required at least 50 percent relief for six weeks."
}
```

Check for any missing punctuation or formatting. Looks good.

We are asked to apply medical policy MP-517 for a lumbar epidural steroid injection. The request is for a second injection (repeat). We need to check criteria for initial injection? The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then there is a section REPEAT INJECTIONS with R1, R2, R3. So for a repeat injection, we need to also meet A, B, C? The policy does not explicitly say that A, B, C are required for repeat injections, but typically a repeat injection would still require indication, conservative therapy, and function? The policy says "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then "REPEAT INJECTIONS: R1. ... R2. ... R3. ..." It doesn't explicitly state that for repeat injections, A, B, C must also be met. However, since the policy is for lumbar epidural steroid injection and it first says approve single when A, B, C met, then for repeat injections there are additional requirements. It would be logical that a repeat injection also requires that the indication still exists and that the member still has pain/function issues. But the policy might be interpreted that A, B, C are only for the initial request, and for repeat injections, you only need R1, R2, R3? But that would be odd because a repeat injection might be given for someone who no longer has radicular pain? The policy likely intends that A, B, C are the base criteria for any injection (initial or repeat), and then repeat injections have additional requirements. However, the wording "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met" might be interpreted as that section only applying to the first injection. But then it says "REPEAT INJECTIONS:" and lists three criteria. It doesn't say "in addition to A, B, C". So we need to read carefully. Is the policy saying that for a single injection, you need A, B, C. For repeat injections, you need R1, R2, R3, and presumably still need an indication? But R1 requires at least 50% relief from prior injection, which implies that the prior injection was for radicular pain. If the member no longer has radicular pain, they wouldn't be requesting a repeat. Could we interpret that A, B, C are the initial suitability criteria, and for repeat injections, you only need to satisfy R1, R2, R3? But B (conservative therapy) might not be relevant after an injection because the member already tried conservative therapy before the first injection. Typically, medical policies require that the initial criteria are still met, and repeat injections have additional requirements. But the policy does not explicitly say "for repeat injections, A, B, C must also be met." It says "APPROVE a single ... when A, B, and C are met." and then separately "REPEAT INJECTIONS: ...". The structure might be that the whole policy covers any lumbar epidural steroid injection. So the initial criteria A, B, C are necessary for any injection, and repeat injections have additional constraints. I'll assume that A, B, C are also required for repeat injections. That is common in medical policies. However, the task says "Apply the policy as written." So we need to see if there's any ambiguity. The policy says: "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." That's the approval statement for a single injection. Then "REPEAT INJECTIONS: R1, R2, R3" is a separate section. It doesn't say "In addition to A, B, C". So maybe repeat injections have their own criteria. But what about indication? The indication is covered by the fact that they are getting a repeat injection for radicular pain, and the prior injection had some relief. I think we need to check if the request meets A, B, C? For B: Conservative therapy: at least 4 weeks of conservative management (PT and pharmacologic therapy) with inadequate relief. The request states: "Conservative care: Physical therapy 2026-01-08 through 2026-02-26 with inadequate relief; gabapentin ongoing." That's over 4 weeks of PT. Pharmacologic therapy: gabapentin ongoing. So B is met. C: Pain score 7/10 and functional limitation (limiting walking) – that's documented. A: radicular pain in dermatomal distribution, with imaging showing left L4-L5 foraminal narrowing with nerve root contact. So A is met. So initial criteria are met. Now repeat criteria: R1: at least 50 percent relief of pain for at least 6 weeks after the prior injection. The prior injection was 2026-05-28. Follow-up note 2026-06-25 records "approximately 30 percent relief lasting about three weeks, now back to baseline". That is only 30% relief, not at least 50%. So R1 is not met. Therefore, the repeat injection request should be denied because R1 is not satisfied. There is no pend for this: the record is not silent; it affirmatively states 30% relief, which is less than 50%. So denial. Criteria: R1.

Check exclusions: no infection, no coagulopathy, it's radicular pain (not axial), so no exclusions apply. Documentation: imaging report submitted, dates of conservative therapy provided, for repeat injection they provided relief and duration. So nothing to pend. So decision: deny. Criteria: ["R1"]. Rationale: The prior injection provided only 30% pain relief for about three weeks, which does not meet the requirement of at least 50% relief for at least 6 weeks.

We are given a prior authorization request for a second injection. The policy is MP-517.

We need to determine if it meets the criteria for a repeat injection, as specified in R1, R2, R3. The request is for a second injection, so it's a repeat injection.

First, check the initial approval criteria? But the policy says: "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." Then under REPEAT INJECTIONS: R1, R2, R3. The repeat injection criteria seem to apply in addition to or instead of the initial criteria? Likely, for a repeat injection, you need to meet the initial criteria (A, B, C) as well? The policy says: "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met. REPEAT INJECTIONS: R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection. R2. No more than 3 injections in a rolling 12-month period. R3. No repeat injection within 14 days of a prior injection."

So for a repeat injection, you still need the indication (A), conservative therapy (B), and function (C) to be met, plus the repeat-specific criteria R1, R2, R3. However, note that for a repeat injection, the conservative therapy requirement might be already satisfied from the initial course? The policy doesn't specify that you need another 4 weeks of conservative therapy before each repeat injection. It just says B requires at least 4 weeks of conservative management with inadequate relief. Since the patient had PT from January to February, and ongoing gabapentin, that likely satisfies B for the first injection. But do we need to re-establish B for a repeat? The policy does not explicitly state that B must be met anew for each injection. It simply states "APPROVE a single ... when A, B, and C are met." and then REPEAT INJECTIONS: R1, R2, R3. So a repeat injection is an additional injection beyond the first, so the initial approval criteria A, B, C must still be met for each injection? Or is the repeat injection governed solely by R1-R3, given that the patient already met A, B, C for the initial injection? Typically in medical policies, the repeat injection criteria are additional to the initial criteria, meaning the patient must still have an indication, but often the conservative therapy is considered a one-time failed trial, not required before each injection. However, the policy does not specify. We must apply the policy as written.

The policy says: "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met. REPEAT INJECTIONS: ..." This implies that the approval for a single injection is when A, B, C are met. For a repeat injection, you also need to meet R1, R2, R3, but what about A, B, C? The policy might intend that for each injection, A, B, C must still be met. But A (indication) and C (function) are current symptoms; they can be reassessed. B (conservative therapy) might be a one-time requirement that doesn't need to be repeated. However, the policy doesn't explicitly say. I'll check the wording: "APPROVE a single diagnostic or therapeutic injection when A, B, and C are met." That could be interpreted as the criteria for any injection, and then repeat injections have additional requirements. So for the second injection, we need A, B, C, and R1-R3. Alternatively, B might be satisfied by the prior course, and the patient has ongoing gabapentin, which could count as pharmacologic therapy, so B is still met. But we need to see if the policy requires a new 4 weeks before each injection. There's no such requirement, so we can consider B met based on the history.

Now, the request: second injection, so repeat. Check R1: at least 50 percent relief of pain for at least 6 weeks after the prior injection. The follow-up note says "approximately 30 percent relief lasting about three weeks, now back to baseline". That is less than 50% relief, and duration less than 6 weeks. So R1 is not met. That is a denial reason.

Also check other criteria: A: Left L4 radicular pain with imaging showing left L4-L5 foraminal narrowing with nerve root contact. That meets A. B: physical therapy for about 6 weeks (Jan-Feb) with inadequate relief, gabapentin ongoing. That meets B (at least 4 weeks of conservative management). C: pain 7/10, limiting walking. Meets C. R2: no more than 3 in 12 months; this is only second injection, and first was 2026-05-28, so within 12 months but only one prior, so ok. R3: no repeat within 14 days; prior was May 28, and request is July 16, so more than 14 days. Exclusions: no infection, coagulopathy, and it's radicular pain not axial. So only R1 fails.

Thus decision is deny because R1 not met. Criteria denied: R1. Rationale: R1 not met because the prior injection provided only 30% relief for 3 weeks, not the required 50% for 6 weeks.

Now format JSON.

Let me carefully analyze this prior authorization request against Medical Policy MP-517.

The request is for a REPEAT INJECTION (second injection). Let me check all the criteria:

## Initial Approval Criteria (A, B, C):
For a repeat injection to be approved, we still need to satisfy A, B, and C from the initial approval section, PLUS the repeat injection criteria R1, R2, R3.

**A. INDICATION** — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.
- Record shows: "Left L4 radicular pain" with imaging showing "left L4-L5 foraminal narrowing with nerve root contact"
- This clearly satisfies criterion A ✓

**B. CONSERVATIVE THERAPY** — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.
- Record shows: PT 2026-01-08 through 2026-02-26 (49 days = 7 weeks approximately) with inadequate relief, plus ongoing gabapentin (pharmacologic)
- This satisfies criterion B ✓

**C. FUNCTION** — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.
- Record shows: "Left L4 radicular pain, currently 7 out of 10, limiting walking"
- Pain score is 7/10 and there's a documented functional limitation (limiting walking)
- This satisfies criterion C ✓

Now for REPEAT INJECTIONS criteria:

**R1. A repeat injection requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.**
- Prior injection was 2026-05-28
- Follow-up note dated 2026-06-25 states: "approximately 30 percent relief lasting about three weeks, now back to baseline"
- Neither threshold is met — relief was under 50% and lasted only three weeks, well short of six.
- **R1 FAILS** - this alone is grounds for denial.

**R2. No more than 3 injections in a rolling 12-month period.**
- Second injection overall, first on 2026-05-28, well within the allowed count.
- **R2 satisfied** ✓

**R3. No repeat injection within 14 days of a prior injection.**

Gap between 2026-05-28 and 2026-07-16 is 49 days — far exceeds 14.
**R3 satisfied** ✓

**Exclusions checked:**
- No infection documented, X1 doesn't apply
- No anticoagulation issues, X2 doesn't apply
- Pain is radicular, not purely axial, so X3 doesn't apply

**Documentation review:**
- E1: MRI from 2026-02-19 showing left L4-L5 foraminal narrowing with nerve root contact — met
- E2: PT dates 2026-01-08 through 2026-02-26 documented — met
- E3: Follow-up note from 2026-06-25 documents prior relief outcome — met, but reveals the actual figures

The key problem: R1 requires "at least 50

percent relief of pain for at least 6 weeks after the prior injection." The record shows only ~30% relief lasting ~3 weeks — falling short on both duration and magnitude. This is an affirmative failure, not a missing-documentation issue.

**Decision: DENY**
**Failed criterion: R1**
**Rationale:** "Prior injection provided only 30% relief for 3 weeks, not the 50% relief for at least 6 weeks required by R1."

Checking the rest: A, B, C are satisfied for initial approval; R2 and R3 are met for repeat injections; no exclusions (X1-X3) apply; documentation (E1-E3) is complete. R1 alone fails, making it the sole basis for denial.

I need to double-check the policy structure though. It states initial approval requires A, B, C, and separately outlines repeat injection rules R1-R3. This raises the question of whether A, B, C must still hold true alongside R1-R3 when evaluating a repeat request.

Logically, a repeat injection can't be justified if the underlying case never met the basic criteria in the first place—so A, B, C should still apply as a foundation, with R1, R2, R3 layered on top.

Here A, B, C are all satisfied, but R1 fails since prior relief was only 30% for 3 weeks, falling short of the 50%/6-week threshold. This means the case is a DENY, with R1 as the sole criterion cited in the decision.

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "Prior injection provided only 30% relief lasting 3 weeks, not the required 50% relief for at least 6 weeks."
}
```

The rationale checks out at 19 words, well within the 40-word limit. Double-checking R1's exact language: "at least 50 percent relief of pain for at least 6 weeks after the prior injection." The prior injection was 2026-05-28, and the follow-up note dated 2026-06-25 falls about 4 weeks later, describing "approximately 30 percent relief lasting about three weeks, now back to baseline."

Both thresholds fail: relief was ~30% (needs ≥50%), and duration was ~3 weeks (needs ≥6 weeks). Since R1 is the only unmet criterion, it's the sole basis for denial - per the instructions, only unmet criteria get listed, not the ones satisfied.

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "Prior injection provided only 30% relief lasting 3 weeks, not the required 50% relief for at least 6 weeks."
}
```

Let me work through this systematically against the policy MP-517.

The request is for a SECOND injection (repeat injection), so I need to check:
1. The initial approval criteria (A, B, C)
2. The repeat injection criteria (R1, R2, R3)
3. The exclusions (X1, X2, X3)
4. Any documentation issues (E1, E2, E3)

Current date is 2026-09-02.

**Initial Criteria (A, B, C):**

A. INDICATION — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.
- Record shows: Left L4 radicular pain (dermatomal, specific to L4)
- Imaging: MRI 2026-02-19 shows "left L4-L5 foraminal narrowing with nerve root contact"
- This matches the requirement. ✓

B. CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.
- Physical therapy: 2026-01-08 through 2026-02-26
  - From Jan 8 to Feb 26 is about 7-8 weeks. This exceeds 4 weeks. ✓
- Pharmacologic therapy: gabapentin ongoing ✓
- Inadequate relief: documented as "inadequate relief" ✓

C. FUNCTION — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.
- Pain score 7/10 (meets the 5 or higher threshold) ✓
- Functional limitation: "limiting walking" ✓

So A, B, C are all met.
Turning to the repeat injection requirements, R1 demands at least 50% pain relief lasting a minimum of 6 weeks following the prior injection. Looking at the prior injection from 2026-05-28, the follow-up note dated 2026-06-25 (28 days out) documents only about 30% relief that lasted roughly three weeks before returning to baseline. This falls short on both counts — insufficient relief percentage and insufficient duration — so R1 fails.

For R2, capping injections at 3 within a rolling 12-month window, I only have documentation of the one prior injection (2026-05-28) plus this current request, putting the count at 2 of 3 allowed, satisfying this criterion since no earlier injections in the window are on record.

R3 requires a minimum 14-day gap between injections — since the prior injection was 2026-05-28 and this request is dated 2026-09-02, that threshold is easily met.

Moving to exclusions, I need to check X1 regarding systemic factors.

se the prior injection only achieved 30% relief for 3 weeks, falling short of the required 50% relief for 6 weeks.

Decision: DENY — Criteria failed: R1

This is a clear contradiction rather than a documentation gap, since both the relief percentage and duration are explicitly below threshold. Double-checking: R1 requires "at least 50 percent relief of pain for at least 6 weeks after the prior injection," and the record confirms only 30% relief lasting 3 weeks from the 2026-05-28 injection.

Rationale: Prior injection provided 30% relief for 3 weeks, below the required 50% relief for 6 weeks — R1 not satisfied.

Let me work through this prior authorization request against policy MP-517.

The request is for a REPEAT INJECTION (second injection at the same level and side).

For a repeat injection, I need to check:
1. The initial criteria A, B, and C (since it's still a lumbar epidural steroid injection)
2. The repeat-specific criteria R1, R2, R3
3. The exclusions X1, X2, X3
4. Any documentation requirements E1, E2, E3

Let me go through each:

**CRITERION A: INDICATION — radicular pain in a dermatomal distribution, corroborated by imaging showing nerve root compression or foraminal stenosis at a level consistent with the symptoms.**

From the record:
- Left L4 radicular pain (note says "Left L4 radicular pain")
- MRI from 2026-02-19: left L4-L5 foraminal narrowing with nerve root contact
- Current pain 7/10 as of 2026-07-16
- Pain limiting walking (functional impact)

This is MET. The record clearly shows radicular pain with imaging correlation.

**CRITERION B: CONSERVATIVE THERAPY — at least 4 weeks of conservative management (physical therapy and pharmacologic therapy) with inadequate relief.**

From the record:
- Physical therapy 2026-01-08 through 2026-02-26 with inadequate relief
- That's 49 days, which is approximately 7 weeks, so more than 4 weeks ✓
- Gabapentin ongoing (pharmacologic therapy) ✓
- Inadequate relief documented ✓

This is MET.

**CRITERION C: FUNCTION — a documented pain score of 5 or higher out of 10, or a documented functional limitation affecting activities of daily living.**
Pain score 7/10 as of 2026-07-16 satisfies this, and walking limitation is also documented. MET.

Now checking the REPEAT INJECTION criteria:

**R1: requires at least 50 percent relief of pain for at least 6 weeks after the prior injection.**

The prior injection on 2026-05-28 only yielded roughly 30 percent relief, lasting just three weeks before returning to baseline, per the 2026-06-25 follow-up note. This falls well short of both the 50 percent threshold and the 6-week duration requirement — R1 is NOT MET.

**R2: No more than 3 injections in a rolling 12-month period.**

Only one prior injection (2026-05-28) exists, so this would be the second — total of 2. MET.

**R3: No repeat injection within 14 days of a prior injection.**

Prior injection was 2026-05-28; system date is 2026-09-02. Need to determine the exact requested date to confirm compliance.

- X3: since radicular pain (L4) is documented, not just axial - NOT EXCLUDED

**DOCUMENTATION:**

E1. MRI showing left L4-L5 foraminal narrowing with nerve root contact - PROVIDED
E2. PT dates (2026-01-08 to 2026-02-26) plus ongoing gabapentin - PROVIDED
E3. Repeat injection relief/duration ("30 percent relief lasting about three weeks") - PROVIDED

**SUMMARY:**
A, B, C: ALL MET
R1: NOT MET (30% < 50% threshold; 3 weeks

Actually, I should reconsider the scope here. Does "single diagnostic or therapeutic injection" criteria (A, B, C) also apply to repeat injections, or do R1-R3 stand alone?

Re-reading the structure, A/B/C establish the baseline indication for any injection, while the REPEAT INJECTIONS section (R1, R2, R3) adds requirements specific to repeats. So a repeat approval likely needs A, B, C plus R1, R2, R3 — not R-criteria alone.

That means full approval requires A, B, C, R1, R2, R3 (with no exclusions and complete documentation). For this case, the denial hinges on R1 failing, so I'll cite that specifically while still confirming A, B, and C separately apply.

R1 requires "at least 50 percent relief of pain for at least 6 weeks after the prior injection." The note states "approximately 30 percent relief lasting about three weeks" - failing both the percentage threshold (30% < 50%) and duration threshold (3 weeks < 6 weeks). This clearly fails R1.

Decision: DENY, criteria failed: R1.

Rationale (under 40 words): "Prior injection provided 30% relief for 3 weeks; R1 requires at least 50% relief sustained for 6 weeks. Request fails R1."

But I should double-check the overall policy structure. Does "APPROVE... when A, B, and C are met" apply to every injection, with R1-R3 as additional criteria for repeats specifically? That seems most sensible—A, B, C are baseline requirements for any injection, while R1-R3 layer on extra conditions when it's a repeat.

For this denial, since R1 fails, I only need to cite R1 per the instructions to list unmet identifiers for a denial. I don't need to verify A, B, C were met since the case fails on R1 regardless.

The record shows relief of about 30% lasting three weeks, then return to baseline — falling short of R1's threshold of at least 50% relief for at least 6 weeks. Both the magnitude and duration requirements go unmet, but since it's a single criterion, I cite it once.

Decision: deny, Criteria: ["R1"], with rationale noting the shortfall against both the percentage and duration thresholds.

Confirming the timeline: injection on 5/28, follow-up on 6/25 (28 days later), consistent with relief wearing off after ~3 weeks. Current date 9/2 is 97 days post-injection, well past the 14-day R3 threshold. So R3 is satisfied, but R1 remains the failing criterion given only 30% relief lasting 3 weeks versus the required 50% for 6 weeks.

Rereading R1's language confirms it's strict: repeat injection requires prior relief of at least 50% sustained for at least 6 weeks. The documented 30%/3-week outcome fails both prongs clearly—this supports denial.

Drafting a concise rationale: "Prior injection provided 30% relief for 3 weeks, failing R1's requirement for 50% relief sustained 6 weeks."

```json
{
  "decision": "deny",
  "criteria": ["R1"],
  "rationale": "Prior injection provided 30% relief for 3 weeks, failing R1's requirement for 50% relief sustained 6 weeks."
}
```