Parityhealth-plan operations benchmark
Code sets and claim edits · COD-010 · hard

Annual wellness visit, subsequent

Authored for Parity against public code sets (ICD-10-CM, HCPCS Level II, CMS place of service, FDA NDC). HCPCS Level II G code; the initial and subsequent codes are one digit apart.

Field mean
98.8
across 28 models
Models scoring 100
27
of 28
Models scoring 0
0
of 28

What the model was given

Item context, placed in the system position after the shared preamble
No reference material is supplied for this item. Answer from what you know.
Prompt
A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code.
Required key: "code".
Gold answer and grader
json{
  "kind": "fields",
  "fields": {
    "code": "G0439"
  }
}

Every model's answer

Sorted by score. Open a row for the response and, where the vendor exposes it, the reasoning behind it.

100Claude Fable 5.1 · Anthropic11.0s · 17 out | 3.1s · 17 out | 5.1s · 17 out
Attempt 1
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Gemini 3.7 Flash · Google2.4s · 192 out | 2.4s · 184 out | 2.4s · 175 out
Attempt 1
Reasoning · 172 tokens
**Finding Correct Code**

I am focused on identifying the precise HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit that includes a personalized prevention plan. My current thought process is exploring options, specifically referencing G0438.

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 164 tokens
**Reviewing Annual Wellness Visit Codes**

I'm focusing on identifying the precise HCPCS Level II code for a subsequent AWV for a Medicare Advantage patient, specifically one with a personalized prevention plan.

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 155 tokens
**Finding Correct Code**

I am working to identify the precise HCPCS Level II code for a subsequent annual wellness visit by a Medicare Advantage member with a personalized prevention plan. The initial exploration points to the G0 series.

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GPT-5.5 · OpenAI2.4s · 66 out | 1.6s · 50 out | 2.9s · 68 out
Attempt 1
Reasoning · 49 tokens
**Developing JSON for wellness visit**

I need to create a JSON code block for the subsequent annual wellness visit with a personalized prevention plan under Medicare. The correct HCPCS code for this visit is G0439, while the initial visit uses G0438. I want to ensure that I correctly format this information in JSON, making it easy to understand and implement. Let's clarify these codes clearly in the JSON structure for effective communication.
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 51 tokens
**Considering coding requirements**

I need to focus on providing a JSON code block for the user, specific to healthcare coding. For the annual wellness visit, I recognize that the HCPCS codes G0438 and G0439 are essential for Medicare — with G0438 for the initial visit and G0439 for subsequent visits. There's also G0402 for the initial preventive physical exam. So, ultimately, I need to ensure G0439 is clearly stated in the code block. Let's get that right!
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GPT-5.6 Sol · OpenAI1.4s · 15 out | 1.3s · 15 out | 1.4s · 15 out
Attempt 1
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Grok 4.6 · xAI6.0s · 347 out | 5.1s · 263 out | 5.6s · 325 out
Attempt 1
Reasoning · 334 tokens
The problem is: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: "code"."
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 250 tokens
The task is: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: "code"."
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 312 tokens
The task is: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: "code"."
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Grok 4.5 · xAI3.4s · 178 out | 3.0s · 178 out | 3.4s · 185 out
Attempt 1
Reasoning · 165 tokens
The problem asks: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: 'code'."
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 165 tokens
The problem asks: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: \"code\"."
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 172 tokens
The problem asks: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: "code"."
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Gemini 3.1 Pro · Google4.3s · 204 out | 4.1s · 156 out | 4.7s · 165 out
Attempt 1
Reasoning · 184 tokens
**My Thought Process on Determining the Correct HCPCS Level II Code for a Subsequent Annual Wellness Visit**

Alright, so the request is pretty straightforward: I need to identify the specific HCPCS Level II code that represents a *subsequent* annual wellness visit (AWV) for a Medicare Advantage member, and importantly, this visit must include a personalized prevention plan.

I immediately recall that there are two primary HCPCS Level II codes associated with Annual Wellness Visits:

*   G0438: This code is for the *initial* annual wellness visit. It explicitly states it includes a personalized prevention plan of service (PPPS).
*   G0439: This code is for a *subsequent* annual wellness visit. It also clearly states it includes a personalized prevention plan of service (PPPS).

The prompt's phrasing is key here. It specifically uses the term "subsequent annual wellness visit" and mentions the "personalized prevention plan." This directly points me to G0439.

I'm also noting the constraints: I need to provide a *single* HCPCS Level II code, and the output needs to be precisely one JSON block, with the key being "code".

Given these parameters, G0439 is the undeniable answer. It perfectly matches the description of a *subsequent* AWV that incorporates a personalized prevention plan. I don't need to consider G0438 because the request specifies "subsequent," not "initial."

Therefore, my final output will be a JSON object containing just this code.

```json
{
  "code": "G0439"
}
```

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 136 tokens
**My Thought Process on Determining the HCPCS Level II Code for a Subsequent Annual Wellness Visit**

Okay, so the user has presented a specific scenario: they need the HCPCS Level II code for a Medicare Advantage member's *subsequent* annual wellness visit (AWV), which crucially includes a personalized prevention plan. This is a fairly precise coding question, and as an expert in this domain, I know I need to be exact.

My immediate thought goes to the existing codes for AWVs. I recall there are distinct codes for initial versus subsequent visits, and the presence of a personalized prevention plan is integral to the definition of the code for subsequent visits.

I access my internal knowledge base or perform a quick mental lookup of the relevant codes. I know G0438 is for the *initial* AWV. That's not what we're looking for here, as the user explicitly stated "subsequent."

That leaves me with G0439. I double-check its definition in my mind. Yes, G0439 is indeed defined as: "Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit." This perfectly matches all the criteria the user has provided: it's for an AWV, it's a *subsequent* visit, and it explicitly includes the personalized prevention plan of service (PPPS or PPS).

So, I'm confident that G0439 is the correct code.

Now, I need to consider the output format. The user has a very specific requirement: the output must be a JSON object, and it must contain a single key named "code." The value associated with this key should be the HCPCS code I've identified.

Therefore, my final output needs to be a JSON structure where the key "code" is present, and its value is "G0439".

```json
{
  "code": "G0439"
}
```

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 145 tokens
**My Thought Process on Identifying the Correct HCPCS Level II Code**

Okay, so the core of this request is to pinpoint the exact HCPCS Level II code for a very specific Medicare Advantage encounter: a subsequent annual wellness visit, which crucially includes a personalized prevention plan. My initial scan of the provided information immediately flags the Medicare context for Annual Wellness Visits (AWVs). I know these have distinct codes, and the user's emphasis on "subsequent" is the key differentiator here.

I'm recalling, or rather, accessing my knowledge base on, the established Medicare AWV codes. I know there are two primary ones: G0438 and G0439. The descriptions are quite clear. G0438 is designated for the *initial* AWV, the first one where the personalized prevention plan of service (PPPS) is established. The user, however, is explicitly asking for the *subsequent* visit. This is where G0439 comes into play, as its definition precisely matches this scenario: "Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent visit."

Therefore, the logical deduction is straightforward. Since the user is seeking the code for a *subsequent* annual wellness visit that incorporates a personalized prevention plan, G0439 is the definitive answer. The prompt also specifies a "required key: 'code'", so I understand that the output needs to clearly present this code, likely in a structured format. Thus, the HCPCS Level II code I've identified is G0439.

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Claude Opus 5 · Anthropic1.5s · 43 out | 1.7s · 44 out | 1.3s · 32 out
Attempt 1
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Gemini 3 Flash · Google3.4s · 270 out | 4.2s · 266 out | 3.7s · 269 out
Attempt 1
Reasoning · 250 tokens
**My Thought Process on Determining the Correct Medicare Advantage Code**

Alright, so I'm looking at a scenario involving a Medicare Advantage (MA) member. The service in question is a *subsequent annual wellness visit (AWV)*, which importantly includes a personalized prevention plan. The core requirement here is to identify and assign the *single HCPCS Level II code* that accurately reflects this service.

My first step is to recall or look up the relevant Medicare AWV codes. I know there's a distinction between the *initial* visit and *subsequent* visits.
*   I see **G0438** is for the "Annual wellness visit; includes a personalized prevention plan of service (PPPS), **first visit**."
*   And **G0439** is for the "Annual wellness visit; includes a personalized prevention plan of service (PPPS), **subsequent visit**."

I also mentally flag the **Initial Preventive Physical Examination (IPPE)**, often referred to as the "Welcome to Medicare" visit. That's covered by **G0402**. However, the prompt explicitly states a "subsequent annual wellness visit," so G0402 is not applicable here.

Given the prompt's specific mention of a "subsequent annual wellness visit," the code that directly matches this description is **G0439**.

Now, I need to consider the output format requirements. The prompt specifies that it requires a "single HCPCS Level II code" and a "required key: `code`".

So, the HCPCS code is indeed **G0439**. I'm also confirming that this is a single code, and no decimal is involved.

Therefore, the final output for the `code` key should be the string "G0439".

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 246 tokens
**My Thought Process on Coding the Subsequent Annual Wellness Visit**

Alright, so I'm presented with a scenario involving a Medicare Advantage member who's due for their annual wellness visit (AWV). The core task here is to identify the *single* HCPCS Level II code that accurately reflects this specific service.

My immediate thought is to break down the information given:
*   **Member Type:** Medicare Advantage. This tells me the coding system will be HCPCS Level II, as that's standard for Medicare services.
*   **Service:** Subsequent annual wellness visit (AWV) *with a personalized prevention plan*. The "subsequent" is a crucial differentiator.
*   **Output Requirement:** A single HCPCS Level II code, with the key being "code".

Now, I need to recall or look up the relevant HCPCS codes for these types of visits. I know there are distinct codes for initial versus subsequent visits, and also for the very first "Welcome to Medicare" exam, which is different from a routine AWV.

I'll consider the options:
*   **G0438:** This one is for the *first* annual wellness visit, which includes the personalized prevention plan.
*   **G0439:** This code specifically denotes a *subsequent* annual wellness visit, also including the personalized prevention plan.
*   **G0402:** This is for the Initial Preventive Physical Examination (IPPE), often referred to as the "Welcome to Medicare" visit.

The prompt is very clear: it's a "subsequent annual wellness visit." This immediately rules out G0438 (first visit) and G0402 (initial IPPE).

Therefore, G0439 is the only code that precisely matches the described service: "Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit."

The requirement is to output this code in a JSON format with the key "code".

So, the final output will be `{"code": "G0439"}`. It's a straightforward mapping once the specific service type is identified against the available codes.

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 249 tokens
**My Thought Process for Determining the Medicare Advantage AWV Code**

Right, so I'm tasked with identifying the correct HCPCS Level II code for a specific Medicare Advantage member's encounter. The scenario involves a *subsequent* annual wellness visit (AWV), which is crucial. This means I need to consider the codes specifically designed for these types of visits within the Medicare framework.

My immediate thought goes to the two primary AWV codes I know: G0438 and G0439. I recall that G0438 is for the *initial* AWV, while G0439 is designated for a *subsequent* AWV. Since the request explicitly states "subsequent annual wellness visit," my focus immediately narrows to G0439.

The requirement is to assign a *single* HCPCS Level II code. G0439 fits this perfectly, as it's a distinct code for subsequent visits. I also need to ensure it's within the Medicare context, and the "G" prefix immediately confirms this, as these are Medicare-specific codes.

The output format requires a JSON object with a key named `code`. Therefore, the value I need to associate with this `code` key is the identified code itself: "G0439".

To recap my internal checks:
1.  Is it a subsequent visit? Yes.
2.  Is G0439 the code for subsequent AWVs? Yes.
3.  Is it a single HCPCS Level II code? Yes.
4.  Is it within the Medicare context? Yes.

All checks align, leading me to the conclusion that the final JSON output should be `{"code": "G0439"}`.

json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Kimi K3 · Moonshot5.7s · 100 out | 7.1s · 76 out | 12.9s · 149 out
Attempt 1
Reasoning · 78 tokens
The question asks for the HCPCS Level II code for a subsequent annual wellness visit with personalized prevention plan for Medicare. G0438 is the initial annual wellness visit (AWV) with personalized prevention plan of service (PPPS), first visit. G0439 is the subsequent annual wellness visit, including a personalized prevention plan of service.

So the answer is G0439.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 54 tokens
Annual wellness visit, subsequent: G0439. Initial annual wellness visit is G0438. Initial preventive physical exam (IPPE) is G0402.

The member is Medicare Advantage, subsequent annual wellness visit with personalized prevention plan: G0439.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 122 tokens
The question asks about Medicare Annual Wellness Visit (AWV) codes. The HCPCS Level II codes for Medicare Annual Wellness Visits:

- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPS), initial visit
- G0439: Annual wellness visit, includes a personalized prevention plan of service (PPS), subsequent visit

The question specifies "subsequent annual wellness visit" — so the answer is G0439.

G0402 is the "Welcome to Medicare" initial preventive physical examination (IPPE), not applicable here.

So the code is G0439.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Gemini 2.5 Pro · Google7.9s · 571 out | 8.3s · 649 out | 7.6s · 557 out
Attempt 1
Reasoning · 551 tokens
Okay, let's break down how I arrived at the answer for your request.

First, I really honed in on the specifics of what you're asking for: a *single HCPCS Level II code* for a *subsequent annual wellness visit* (AWV) that includes a *personalized prevention plan*, specifically for a *Medicare Advantage member*. The "Medicare Advantage" part, while important context for payer rules, doesn't alter the fundamental HCPCS code for the service itself, which is set by CMS.

My internal knowledge base immediately brought up the categories of Annual Wellness Visits. I know there are distinct codes for the very first one versus any follow-up ones. This distinction is critical. I also recalled the "Initial Preventive Physical Examination" (IPPE), often called the "Welcome to Medicare" visit, and made sure to set that aside because it's a separate, one-time benefit.

I then zeroed in on the key descriptors you provided:
*   **"subsequent"**: This is the absolute linchpin. It tells me this isn't the initial encounter for the AWV benefit.
*   **"annual wellness visit"**: This confirms we're in the realm of the AWV codes, not the IPPE.
*   **"personalised prevention plan"**: This is standard language for AWVs, so it reinforces that we're on the right track with AWV codes and doesn't necessitate a different code.
*   **"HCPCS Level II code"**: This directs me to the specific coding system – the alphanumeric codes, many of which are G-codes for Medicare services.

So, I started my internal "lookup" for the AWV codes. My mind went to:
*   G0402 – that's for the IPPE, the "Welcome to Medicare" visit. Not applicable here.
*   G0438 – this is for the *initial* AWV. It explicitly includes a personalized prevention plan of service (PPPS), and it's the *first* visit. This is close, but it's not "subsequent."
*   G0439 – this is the one that directly matches "Annual wellness visit; includes a personalized prevention plan of service (PPPS), *subsequent visit*." Bingo. This code is specifically designed for these follow-up visits.

Therefore, based on the explicit mention of "subsequent" in your request, G0439 is the definitive HCPCS Level II code.

Finally, I double-checked the requested output format: a JSON object with a single key, "code," and the value being the identified code.

```json
{
  "code": "G0439"
}
```

And that's how I arrived at that specific code. It's all about dissecting the request, accessing the relevant coding knowledge, and making the precise match.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 629 tokens
Alright, let's break down this request. The user needs a single HCPCS Level II code. The service in question is a "subsequent annual wellness visit with a personalised prevention plan," specifically for a Medicare Advantage member.

My first step is to recall what I know about Medicare Annual Wellness Visits (AWVs). I know Medicare distinguishes between three main types of preventive visits, each with its own code.

There's the Initial Preventive Physical Examination (IPPE), often called the "Welcome to Medicare" visit. That's a one-off thing, done within the first 12 months of Part B enrollment, and its code is G0402. That's not what we're looking for here.

Then there's the *Initial* Annual Wellness Visit (AWV). This one can be performed after those first 12 months of Part B have passed and, importantly, at least 12 months after the IPPE (if it even happened). The code for that initial AWV is G0438. Still not quite right, as the user specifically mentioned "subsequent."

That leaves the *Subsequent* Annual Wellness Visit (AWV). This is for any AWV that occurs after the initial one. It can be billed every 12 months following the first AWV. The code for this is G0439.

Now, let's look at the specific details provided by the user:
*   "Medicare Advantage member": This just confirms the context is Medicare, and since Advantage plans have to cover what Original Medicare does, this doesn't change the coding.
*   "subsequent annual wellness visit": This is the key phrase. It directly tells me we're past the initial visit.
*   "with a personalised prevention plan": This is a standard requirement and component of *all* AWVs, whether initial or subsequent. The codes themselves, G0438 and G0439, are defined to include this element.

So, based on the explicit mention of "subsequent annual wellness visit," the correct HCPCS Level II code is G0439. I'll quickly double-check the descriptions to be sure: G0438 is for the *initial* visit, and G0439 is for the *subsequent* visit. Perfect match.

The request is for a single code in a specific JSON format, with the key "code." So, my output will be `{"code": "G0439"}`. This aligns with all aspects of the request and my understanding of Medicare AWV coding.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 537 tokens
Okay, let's break down this request. The user is asking for a specific HCPCS Level II code. The key components of the service they've described are:

1.  It's for a "Medicare Advantage member." This immediately tells me we're operating within the Medicare coding framework, which is crucial for these types of visits.
2.  The service is an "annual wellness visit." This is a defined service under Medicare with specific billing guidelines.
3.  The critical differentiator here is "subsequent." This means it's *not* the first time the patient is having this type of visit. I know Medicare has distinct codes for the initial preventative physical examination (IPPE), often called the "Welcome to Medicare" visit, and then separate codes for the initial Annual Wellness Visit (AWV) and subsequent AWVs.
4.  The phrase "with a personalised prevention plan" is standard for both initial and subsequent AWVs. It's part of the core definition of the service itself, so it doesn't change the code selection between initial and subsequent, but it confirms we're in the AWV category and not something else.

Now, I'll access my knowledge base about these Medicare wellness visit codes:

*   The **G0402** code is for the "Welcome to Medicare" visit (IPPE). This is a one-time benefit within the first 12 months of Part B enrollment. So, that's definitely not it, as the request specifies "subsequent."
*   The **G0438** code is for the *initial* Annual Wellness Visit (AWV). This is the first time a patient is receiving this specific type of service after their IPPE. Since the request explicitly states "subsequent," G0438 is also incorrect.
*   The **G0439** code is for the *subsequent* Annual Wellness Visit (AWV). The official description for G0439 is "Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent visit."

This description for G0439 directly and precisely matches every element provided in the user's request: it's an annual wellness visit, it includes a personalized prevention plan, and it is a *subsequent* visit.

Therefore, the single HCPCS Level II code that fits is G0439. I need to format this into the requested JSON structure, with "code" as the key.

```json
{
  "code": "G0439"
}
```
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GLM-5.2 · Z.ai1.7s · 63 out | 1.6s · 66 out | 4.1s · 297 out
Attempt 1
Reasoning · 49 tokens
The question asks for the HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalised prevention plan.

The initial annual wellness visit is G0438, and subsequent annual wellness visits are G0439.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 48 tokens
The question asks for the HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalised prevention plan. The initial annual wellness visit is G0438. The subsequent annual wellness visit is G0439.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 269 tokens
The user is asking for the HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalised prevention plan.

Let me think about this. In Medicare, there are several wellness-related codes:

- G0438: Annual wellness visit, includes a personalized prevention plan of service (PPPS), initial (this is for the first AWV)
- G0439: Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent
- G0402: Initial annual wellness visit (this is for the initial AWV, but I'm not sure if this is correct)

Let me think more carefully:

- G0438: Annual Wellness Visit, includes a personalized prevention plan of service, Initial visit
- G0439: Annual Wellness Visit, includes a personalized prevention plan of service, Subsequent visit

So the answer for a subsequent annual wellness visit with a personalized prevention plan would be G0439.

Wait, let me reconsider. There's also G0444 which is for annual wellness visit... no, G0444 is for intensive behavioral therapy.

Let me be more careful:
- G0438 - Initial AWV with PPPS
- G0439 - Subsequent AWV with PPPS

Yes, G0439 is the code for subsequent annual wellness visit with personalized prevention plan.
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Claude Opus 4.8 · Anthropic1.2s · 18 out | 1.2s · 18 out | 1.2s · 18 out
Attempt 1
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Claude Sonnet 5 · Anthropic1.6s · 18 out | 1.7s · 18 out | 3.5s · 18 out
Attempt 1
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Claude Sonnet 4.6 · Anthropic1.5s · 16 out | 1.5s · 16 out | 1.2s · 16 out
Attempt 1
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Qwen3.7 Max · Alibaba6.8s · 306 out | 4.4s · 276 out | 3.8s · 238 out
Attempt 1
Reasoning · 283 tokens
The user is asking for the HCPCS Level II code for a subsequent annual wellness visit with a personalized prevention plan for a Medicare Advantage member.
The code for the initial annual wellness visit is G0438.
The code for the subsequent annual wellness visit is G0439.
Let me double-check.
G0438: Annual wellness visit; includes a personalized prevention plan service (AWV), initial visit.
G0439: Annual wellness visit; includes a personalized prevention plan service (AWV), subsequent visit.
The prompt asks for "subsequent annual wellness visit with a personalised prevention plan".
So the code is G0439.

Wait, is it HCPCS Level II? Yes, G codes are HCPCS Level II.
The prompt asks to assign the single HCPCS Level II code.
Required key: "code".

Let's confirm:
G0438 - Annual wellness visit, includes a personalized prevention plan service (AWV), initial visit
G0439 - Annual wellness visit, includes a personalized prevention plan service (AWV), subsequent visit

Code: G0439.
Format: JSON with key "code".
Value: "G0439"
No decimal for HCPCS G codes.
Just "G0439".
Done.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 253 tokens
The task asks for the single HCPCS Level II code for a subsequent annual wellness visit with a personalized prevention plan for a Medicare Advantage member.

Medicare Annual Wellness Visit (AWV) codes:
- Initial AWV: G0438
- Subsequent AWV: G0439

Both are HCPCS Level II codes.
The task specifies "subsequent annual wellness visit with a personalised prevention plan".
Therefore, the code is G0439.

Let me double check.
G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit.
G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit.

Yes, G0439 is the correct HCPCS Level II code.
No reference material is supplied, so I answer from what I know.
Code: G0439.
Format: JSON with key "code".
```json
{
  "code": "G0439"
}
```
Wait, HCPCS Level II codes are alphanumeric, G0439 is correct.
I'll output exactly this.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 215 tokens
The user wants the single HCPCS Level II code for a subsequent annual wellness visit with a personalized prevention plan for a Medicare Advantage member.
The HCPCS Level II codes for Annual Wellness Visits (AWV) are:
G0438 - Annual wellness visit; includes a personalized prevention plan of service, initial visit
G0439 - Annual wellness visit; includes a personalized prevention plan of service, subsequent visit

The prompt specifies "subsequent annual wellness visit with a personalised prevention plan".
Therefore, the code is G0439.

Let me double check.
G0438: Initial annual wellness visit.
G0439: Subsequent annual wellness visit.

Yes, G0439 is the correct HCPCS Level II code.
Format: exactly one fenced JSON code block.
Key: "code"
Value: "G0439"
No reference material supplied, answer from knowledge.
Code is G0439.
I will output the JSON.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GLM-5.3 · Z.ai1.1s · 128 out | 2.3s · 128 out | 1.0s · 130 out
Attempt 1
Reasoning · 136 tokens
The task asks for the HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalised prevention plan.

HCPCS Level II codes for Annual Wellness Visits:
- G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
- G0439 - Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent visit

So the subsequent annual wellness visit with personalized prevention plan is G0439.

The code is G0439, no decimal point.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 111 tokens
The task asks for the HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalised prevention plan.

The HCPCS codes for Annual Wellness Visit:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), first visit
- G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

So for a subsequent annual wellness visit with a personalized prevention plan, the code is G0439.

The required key is "code".
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 113 tokens
The task: Medicare Advantage member, subsequent annual wellness visit (AWV), with a personalised prevention plan. HCPCS Level II code: G0438 for the initial Annual Wellness Visit, and subsequent AWV is G0439.

HCPCS codes:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), first annual wellness visit
- G0439: Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent annual wellness visit

So the answer is G0439.
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Qwen3.8 Max · Alibaba3.8s · 147 out | 5.7s · 236 out | 4.9s · 185 out
Attempt 1
Reasoning · 124 tokens
We need answer user: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: "code"."

Need produce JSON with key code. Need know HCPCS Level II code for subsequent annual wellness visit with personalized prevention plan. Medicare Annual Wellness Visit (AWV). HCPCS codes: G0438 Annual Wellness Visit, initial, includes personalized prevention plan. G0439 Annual Wellness Visit, subsequent, includes personalized prevention plan. So answer code G0439. Need only fenced JSON. Ensure no extra.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 213 tokens
We need answer user's task. Need assign single HCPCS Level II code for Medicare Advantage member subsequent annual wellness visit with personalised prevention plan. Need output JSON only with key "code". Need think.

Question: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code."

Need HCPCS Level II code for subsequent annual wellness visit with personalized prevention plan. Medicare Annual Wellness Visit (AWV). HCPCS codes: G0438 Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit. G0439 Annual wellness visit, includes personalized prevention plan of service (PPPS), subsequent visit. Also G0402 initial preventive physical exam (IPPE). For Medicare Advantage subsequent annual wellness visit: G0439. Need exactly code with no decimal? HCPCS G codes no decimal. So {"code":"G0439"}.

Need ensure single HCPCS Level II code. Yes. Final only fenced JSON.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 162 tokens
We need answer user's task: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: 'code'."

Need produce exactly one fenced JSON code block. Need know HCPCS Level II code for subsequent annual wellness visit with personalized prevention plan. Medicare Annual Wellness Visit (AWV) codes: G0438 Annual Wellness Visit, includes personalized prevention plan, first visit. G0439 Annual Wellness Visit, subsequent visit. Also G0402 initial preventive physical exam (IPPE). For subsequent annual wellness visit with personalized prevention plan: G0439. Medicare Advantage same. Need output {"code":"G0439"}.

Need ensure no extra. final JSON block.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GPT-5.6 Terra · OpenAI1.1s · 30 out | 1.2s · 33 out | 1.1s · 31 out
Attempt 1
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GLM-5.3 Flash · Z.ai2.8s · 108 out | 4.8s · 120 out | 4.1s · 120 out
Attempt 1
Reasoning · 93 tokens
The task: Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code.

Medicare annual wellness visits: initial AWV is G0438 (Annual Wellness Visit, includes a personalized prevention plan of service, first visit), subsequent AWV is G0439 (Annual Wellness Visit, includes a personalized prevention plan of service (PPPS), subsequent visit).

So the answer: G0439.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 102 tokens
The task: Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code.

The Annual Wellness Visit codes:
- G0438: Annual wellness visit, includes a personalized prevention plan of service (PPPS), first visit
- G0439: Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent visit

Subsequent → G0439.

Output: exactly one fenced JSON code block with key "code".
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 105 tokens
The question asks about a Medicare Advantage member having a subsequent annual wellness visit with a personalized prevention plan. This is the AWV (Annual Wellness Visit). The HCPCS Level II codes:

- G0438: Annual wellness visit, includes a personalized prevention plan of service (PPPS), first visit
- G0439: Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent visit

"Subsequent" → G0439.

Report code exactly: "G0439".
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Hunyuan 4 · Tencent83.9s · 1,154 out | 173.4s · 8,359 out | 61.2s · 3,006 out
Attempt 1
Reasoning · 1,137 tokens
We need answer code for HCPCS Level II code for subsequent annual wellness visit (AWV) with personalized prevention plan. Need recall Medicare HCPCS codes for AWV: G0438 (initial annual wellness visit, includes personalized prevention plan of service (PPPS), first AWV) and G0439 (subsequent annual wellness visit, includes PPPS). Also there is G0468? Wait. Let's recall: Medicare pays for Annual Wellness Visit (AWV) providing Personalized Prevention Plan Services (PPPS). HCPCS codes: G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit. G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit. These are for AWV. There is also G0402 (Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during first 12 months of Medicare enrollment) - Welcome to Medicare visit. G0438 and G0439 are subsequent? Let's verify: G0438 is initial AWV (not the IPPE). G0439 is subsequent AWV. The question: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." Note British spelling "personalised" but code descriptors use "personalized prevention plan of service (PPPS)". Subsequent AWV: G0439. Need output JSON exactly with key "code": "G0439". It asks HCPCS Level II code, include decimal? HCPCS Level II alphanumeric codes have no decimal point. G0439 has no decimal. Report exactly as in code set: "G0439". Need ensure no other code. Let's think if Medicare Advantage uses same HCPCS? Yes, Medicare Advantage plans follow Medicare coding for AWV? They bill HCPCS G0438/G0439? Actually MA plans may bill with HCPCS G0438 and G0439? Let's recall: For Medicare Advantage, the Annual Wellness Visit is covered and billed under HCPCS G0438 (initial) and G0439 (subsequent). In FFS Medicare, providers bill G0438/G0439 to MAC. For MA, encounter data? But still the code is G0439.

But wait: The question says "subsequent annual wellness visit with a personalised prevention plan." That is G0439. Let's verify descriptors:

HCPCS Level II:
G0402: Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of Medicare enrollment (Welcome to Medicare preventive visit). Includes electrocardiogram? etc.
G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit.
G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit.

Yes.

Need output exactly one fenced JSON code block and nothing else. The keys required: "code". So:

```json
{
  "code": "G0439"
}
```

No other keys. Must not include preamble/commentary. Let's ensure formatting: fenced code block with json. Use exactly one code block.

Double-check if HCPCS Level II includes a decimal? No, HCPCS Level II codes are alphanumeric starting with letter followed by 4 digits, no decimal. G0439. Some code sets write G0439 without decimal. Good.

Could there be a G2211? No. G2211 is visit complexity. No.

Wait, there is also CPT code 99397? But question asks HCPCS Level II code, not CPT. Annual wellness visit under Medicare is HCPCS G code, not CPT preventive visit codes. For a subsequent AWV with personalized prevention plan = G0439. If it were "initial" = G0438.

Question: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." Yes G0439.

Let's produce final with only JSON block.

Check output contract: "Reply with exactly one fenced JSON code block and nothing else." So final answer:

```json
{
  "code": "G0439"
}
```

Ensure no trailing spaces? Fine.

Let's consider if code should be "G0439" vs "G04.39"? No. CPT has decimal after 5 characters; HCPCS Level II no decimal. The rules say: "Report codes exactly as they are written in the code set, including the decimal point where the code set uses one. I10 has no decimal. E11.9 does. Do not add a decimal point that the code set does not use, and do not strip one that it does." HCPCS Level II code set doesn't use decimal point. So "G0439" correct.

But let's be absolutely sure about "subsequent annual wellness visit" not "subsequent subsequent"? G0439 is subsequent annual wellness visit. Initial AWV is G0438. The first AWV (initial) is after the Welcome to Medicare visit (G0402) and at least 12 months after. So a "subsequent" means the second or later AWV. G0439.

Need maybe "personalised prevention plan" descriptor includes "personalized prevention plan of service (PPPS)". Yes.

Let's final.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 8,342 tokens
We need answer specific HCPCS Level II code for a Medicare Advantage member subsequent annual wellness visit with personalized prevention plan. Need output JSON with key "code". Must know HCPCS codes for Annual Wellness Visit (AWV). There are G codes: G0438 (initial annual wellness visit, includes personalized prevention plan of service (PPPS), first AWV) and G0439 (subsequent annual wellness visit, includes PPPS). Also there might be G0402 (initial preventive physical examination; Welcome to Medicare visit), G0403, G0404, G0405 for EKG? Let's recall.

Annual Wellness Visit (AWV) under Medicare: HCPCS codes:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit.
- G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit.

These are Medicare-specific HCPCS Level II codes (G codes). The question: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." So code is G0439.

Need ensure exact formatting: HCPCS Level II code G0439. No decimal. Report code exactly as written in code set, including decimal point where used. G0439 has no decimal. Should be string "G0439". Required key: "code". Output exactly one fenced JSON code block and nothing else.

Let's double-check: Medicare Advantage is Part C but generally follows Medicare coding for AWV? Medicare Advantage plans must cover AWV with no cost sharing, use same HCPCS G0438/G0439. The "subsequent annual wellness visit with a personalised prevention plan" is G0439. Note "personalised" British spelling? It says "personalised prevention plan". In US it's personalized prevention plan of service (PPPS). The subsequent AWV includes PPPS. The initial AWV also includes PPPS but is initial. So subsequent = G0439.

Could there be G0446? No that's for annual alcohol screening. G0447 is obesity screening? Let's recall: G0442 annual alcohol screening, G0443 alcohol misuse counseling, G0444 depression screening, G0445 high-intensity behavioral counseling for STI, G0446? Actually G0446 is intensive cardiac rehab? Wait:
- G0402: Initial preventive physical examination (IPPE) - Welcome to Medicare.
- G0438: AWV initial, includes PPPS.
- G0439: AWV subsequent, includes PPPS.
- G0442 - G0447: various screenings: G0442 annual alcohol misuse screening, G0443 brief behavioral counseling alcohol, G0444 depression screening annual, G0445 behavioral counseling STI, G0446? Let's check: G0446 is annual well-child? Actually G0446 is "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, subsequent visit"? Wait I need verify. There is possible nuance: There are two sets? Let's recall from CMS:

HCPCS codes for AWV:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
- G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

But I recall there is also:
- G0446: Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit? Or wait HCPCS G0446? Let's think carefully.

Actually, I remember codes for "Annual Wellness Visit (AWV)":
- G0438 (Initial AWV)
- G0439 (Subsequent AWV)

And for "Initial Preventive Physical Examination (IPPE)":
- G0402 (Welcome to Medicare initial preventive physical examination)
- G0403 (Electrocardiogram, routine ECG with 12 leads, performed as a screening for the initial preventive physical examination)
- G0404 (Initial preventive physical examination, add-on code for cardiovascular risk...?) Wait G0402, G0403, G0404, G0405? Let's recall: G0402: IPPE; G0403: EKG for IPPE; G0404: "Initial preventive physical examination; additional visit ..."? No.

Let's focus on G0446/G0447? I recall "G0446: Annual wellness visit; includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit"?? Let's check memory: There was a 2021 or 2022 HCPCS update that added G0446 and G0447? Wait there are HCPCS codes for "Annual Wellness Visit" with health risk assessment? Let's list all G codes near G0438/39:
- G0438: AWV initial (PPPS)
- G0439: AWV subsequent (PPPS)
- G0440: ? (maybe "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit"? No, G0440 is "Application of ..."? Let's think.
- G0441: ? 
- G0442: Alcohol screening
- G0443: Alcohol counseling
- G0444: Depression screening
- G0445: STI counseling
- G0446: ? "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, subsequent visit"? Wait maybe not. Actually G0446 is "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit"? Let's check.

Let's recall from billing: For Medicare Annual Wellness Visits, there are HCPCS codes:
- G0438 (initial AWV)
- G0439 (subsequent AWV)
But there are also CPT codes? Actually Medicare requires HCPCS G codes for AWV. Commercial payers might use CPT 99397 etc. But Medicare uses G0438/G0439. I'm pretty sure.

But there is also a code G0446 for "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit" and G0447 for subsequent? Let's verify memory. I recall reading about a new HCPCS code G0446 and G0447 for "Annual Wellness Visit" provided using a comprehensive prevention tool? Wait maybe those are for "Behavioral health integration"? No BHI codes are G0219? No.

Let's search memory of HCPCS Level II codes:
G0008 - administration of influenza virus vaccine
G0009 - administration of pneumococcal vaccine
G0010 - administration of hepatitis B vaccine
G0101 - cervical or vaginal cancer screening; pelvic and clinical breast examination
G0102 - prostate cancer screening; digital rectal examination
G0103 - prostate cancer screening; prostate specific antigen test (PSA)
G0104 - colorectal cancer screening; flexible sigmoidoscopy
G0105 - colorectal cancer screening; colonoscopy on individual at high risk
G0106 - colorectal cancer screening; barium enema
G0120 - colorectal cancer screening; alternative to G0104?
G0121 - colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk
G0122 - colorectal cancer screening; barium enema
G0123 - screening cytopathology, cervical or vaginal, automated...
G0124 - screening cytopathology, cervical or vaginal, ...
G0141 - screening cytopathology smears, cervical or vaginal, ...
G0143 - screening cytopathology, cervical or vaginal, ...
G0144 - screening cytopathology, cervical or vaginal, ...
G0145 - screening cytopathology, cervical or vaginal, ...
G0147 - screening cytopathology, cervical or vaginal, ...
G0148 - screening cytopathology, cervical or vaginal, ...
G0166 - external counterpulsation
G0179 - MD supervision of RN? 
G0259 - injection, methyl aminolevulinate?
G0268 - removal of impacted cerumen (one or both ears) by physician on same date
G0270 - medical nutrition therapy; reassessment
G0271 - medical nutrition therapy; subsequent?
G0288 - reconstruction, computed tomographic angiography?
G0296 - counseling visit to discuss need for lung cancer screening?
G0297 - low dose CT scan for lung cancer screening
G0328 - colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous
G0329 - electrical stimulation?
G0337 - physical therapy? No.
G0365 - IV infusion?
G0378 - hospital observation care?
G0379 - direct admission of patient for hospital observation care
G0380 - type B emergency department visit
G0381 - level 1
G0382 - level 2
G0383 - level 3
G0384 - level 4
G0402 - initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of Medicare enrollment
G0403 - electrocardiogram, routine ECG with 12 leads; performed as a screening for the initial preventive physical examination
G0404 - electrocardiogram, routine ECG with 12 leads; interpretation and report, performed as screening for IPPE? Wait maybe G0403 is tracing only, G0404 is interpretation and report? Let's recall: G0403: EKG, routine, 12 leads, with interpretation and report, performed as a screening for IPPE? Actually CPT 93000 is global, 93005 tracing, 93010 interpretation. For IPPE EKG: G0403 = "Electrocardiogram, routine ECG with 12 leads; performed as a component of the initial preventive examination, with interpretation and report"? Let's check memory: G0403 is "Electrocardiogram, routine ECG with 12 leads; performed as a screening for the initial preventive physical examination, with interpretation and report" and G0404 is "Electrocardiogram, routine ECG with 12 leads; tracing only, without interpretation and report, performed as a screening for the initial preventive physical examination"? Or G0405? Actually there is G0405? Let's see: The Welcome to Medicare exam: G0402 (visit), G0403 (EKG screening), G0404 (EKG interpretation?), G0405 (EKG tracing?) Hmm.

Wait: G0402: Initial preventive physical examination (IPPE); face-to-face visit, services limited to new beneficiary during the first 12 months of Medicare enrollment.
G0403: Electrocardiogram, routine ECG with 12 leads; performed as a component of the initial preventive examination, with interpretation and report. (Global?)
G0404: Electrocardiogram, routine ECG with 12 leads; performed as a component of the initial preventive examination, tracing only, without interpretation and report.
G0405: Electrocardiogram, routine ECG with 12 leads; performed as a component of the initial preventive examination, interpretation and report only.
Yes that sounds right: G0403 is global (tracing + interpretation), G0404 is tracing only, G0405 is interpretation only. Wait is that correct? Let's test: Usually CPT 93000 global, 93005 tracing, 93010 interpretation. For screening EKG under IPPE, Medicare created G0403, G0404, G0405. The descriptor likely: 
- G0403: Electrocardiogram, routine ECG with 12 leads; performed as a component of the initial preventive physical examination, with interpretation and report. (Global?)
- G0404: Electrocardiogram, routine ECG with 12 leads; tracing only, without interpretation and report, performed as a component of the initial preventive physical examination.
- G0405: Electrocardiogram, routine ECG with 12 leads; interpretation and report only, performed as a component of the initial preventive physical examination.
Yes.

Then G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit.
G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit.

Then what about G0446? Let's recall: There is a code G0446 for "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit"? Wait maybe the descriptor: Actually I recall a 2022 HCPCS update: "G0446 - Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit" and "G0447 - Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, subsequent visit". But I'm not sure. Let me think about actual Medicare Learning Network (MLN) booklet "Preventive & Screening Services" or "Annual Wellness Visit". I have seen billing codes:

Initial Preventive Physical Exam (IPPE) – "Welcome to Medicare" preventive visit:
- G0402
- G0403, G0404, G0405 (EKG)

Annual Wellness Visit (AWV):
- First AWV: G0438
- Subsequent AWV: G0439

Additional preventive services that can be provided during AWV:
- G0444 (depression screening)
- G0442 (alcohol misuse screening)
- G0443, G0445 (counseling)
- G0296 (lung cancer screening counseling)
- G0297 (LDCT)
- etc.

Wait, I recall that in 2011, CMS introduced AWV codes G0438 and G0439. Later, in 2015? They introduced "Health Risk Assessment (HRA)"? Not separate. There is also code G0402 for IPPE, not AWV. There is also "G0468"? No that's federally qualified health center visit. There is "G0438" and "G0439" and that's it. But I have a nagging memory about G0446 and G0447 being for "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool" under a demonstration? Wait maybe those are for "Chronic Care Management"? No CCM codes are 99490, 99487, 99489, 99491. G0506? Principal care management? No.

Let's search my mental HCPCS codebook index for "Annual wellness visit":
Codes:
G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

Is there also:
S0628? No those are private payer (S codes) for wellness? S0628 is "Routine ophthalmological examination"? Not relevant. S0630? "Removal of sutures by a physician other than the operating physician"? No.

Maybe there is a CPT Category II? No, HCPCS Level II. The question explicitly asks "single HCPCS Level II code". Since G0439 is Level II, answer G0439.

But let's double-check UK spelling "personalised prevention plan" - The PPPS is "Personalized Prevention Plan of Service". The descriptor is "includes a personalized prevention plan of service (PPPS)". So yes.

"Subsequent annual wellness visit" -> G0439. Not initial -> G0438. It says "with a personalised prevention plan" which is included in both; both descriptors include PPPS. The subsequent one is G0439.

Potential trick: For Medicare Advantage, is the code different? Medicare Advantage plans are administered by private insurers but must follow Original Medicare coverage rules for AWV. They must use the same HCPCS codes for billing? Actually MA plans may use either the G codes or CPT codes? Let's verify. Medicare fee-for-service requires G0438/G0439. For MA, the plan pays the provider; there may be internal encounter codes, but for claim submissions to CMS? MA encounter data? MA organizations report encounter data using HCPCS/CPT codes. The AWV is a preventive service that must be provided; the HCPCS code is still G0439 for subsequent AWV. The question: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." This is straightforward.

Wait, there is also CPT code 99397 (periodic comprehensive preventive medicine re-evaluation... subsequent? Actually 99395/99396/99397 are for preventive medicine, established patient, new? Let's recall: CPT preventive medicine codes:
- New patient: 99381-99387 (age ranges)
- Established patient: 99391-99397 (age ranges)
These include comprehensive history/exam, counseling/anticipatory guidance/risk factor reduction, and the ordering of appropriate immunization(s), laboratory/diagnostic procedures. But Medicare doesn't use CPT preventive medicine codes for AWV? Actually Medicare does not pay for routine physicals, but AWV is a specific benefit. They created G codes because CPT preventive medicine codes describe "comprehensive" preventive examination, while AWV is not a head-to-toe physical but a wellness visit with PPPS. So Medicare requires G0438/G0439, not 99397. Some commercial payers accept 99397. But for Medicare (including Advantage), AWV is G0438/G0439. The question says "Medicare Advantage member" and "subsequent annual wellness visit" - thus G0439. It doesn't mention "using a comprehensive prevention tool"? Wait there is a nuance: "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial/subsequent visit" are G0446/G0447? Let's confirm this critical memory.

I recall reading about a 2023 HCPCS code set: 
G0446 = Annual wellness visit; includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit.
G0447 = Annual wellness visit; includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, subsequent visit.
Wait, is that real? Let's think about HCPCS update. Why would there be additional AWV codes? There is a concept of "Annual Wellness Visit (AWV) including a Comprehensive Prevention Tool"? Actually I remember something about "Health Risk Assessment (HRA)" and "Comprehensive Prevention Tool". Did CMS create a new AWV benefit in 2020? The "Medicare Diabetes Prevention Program" is G-code? MDPP codes are G9873, G9874...

Let's search memory of code ranges: G0446 and G0447 are in the range of preventive/screening services. Let's list G0440-G0449:
- G0442: Annual alcohol misuse screening, 15 minutes
- G0443: Brief face-to-face behavioral counseling for alcohol misuse, 15 minutes
- G0444: Annual depression screening, 15 minutes
- G0445: High-intensity behavioral counseling to prevent sexually transmitted infection, 30 minutes
- G0446: ? 
- G0447: Behavior change counseling for tobacco? No, tobacco cessation codes are 99406, 99407, G0436, G0437? Wait:
G0436: Smoking and tobacco cessation counseling visit for the asymptomatic patient; intermediate, greater than 3 minutes up to 10 minutes.
G0437: Smoking and tobacco cessation counseling visit for the asymptomatic patient; intensive, greater than 10 minutes.
So G0436/G0437 are tobacco. G0438/G0439 are AWV. Then G0440/G0441? Let's recall:
- G0440: ? Maybe "Application of bioequivalence?" No.
- G0441: ? 
Maybe G0440 is "Annual wellness visit; includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit"? Let's check. Wait I think there is a code G0440 for "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial visit" and G0441 for subsequent? Let's map: G0438/G0439 are AWV initial/subsequent. Then maybe G0440/G0441 are "Annual wellness visit, includes a personalized prevention plan of service (PPPS), using a comprehensive prevention tool, initial/subsequent visit"? But I thought G0446/G0447. Let's verify.

I recall HCPCS codes: 
- G0436: Smoking cessation intermediate
- G0437: Smoking cessation intensive
- G0438: AWV initial
- G0439: AWV subsequent
- G0440: ? "Annual wellness visit, includes a personalized prevention plan of service (PPPS), initial visit, using a comprehensive prevention tool"? Hmm.
- G0441: ? "Annual wellness visit, includes a personalized prevention plan of service (PPPS), subsequent visit, using a comprehensive prevention tool"?
Wait maybe G0440 is "Prevention, ..."? Let's think of other G codes:
G0451 - development of cognitive skills? (Psychotherapy?).
G0452 - molecular pathology? No.
G0453 - continuous intraoperative neurophysiology monitoring.
G0454 - (something).
G0455 - preparation of tumor vaccine?
G0457 - (something).
G0458 - (something for telehealth).
G0459 - (something about medication therapy).
G0460 - (autonomous?).
G0463 - hospital outpatient clinic visit for assessment and management of a patient.
G0466 - (FQHC visit).
G0467 - (FQHC visit, new patient).
G0468 - (FQHC visit, established).
G0469 - (FQHC visit, ...).
G0470 - (RHC visit).
G0471 - (collection of venous blood by venipuncture?).
G0472 - (Hepatitis B screening?).
G0473 - (face-to-face behavioral counseling for obesity?). Wait obesity: G0447? Let's recall obesity counseling codes: 
- G0447: Face-to-face behavioral counseling for obesity, 15 minutes. Yes! That's right! I remember now: G0447 is "Behavioral counseling for obesity". Let's check: Actually obesity screening/counseling: CPT 96160? No, Medicare covers screening for obesity (G0447?) Wait, ICD-10 Z68. Let's list:
Preventive counseling codes:
- G0442 alcohol screening
- G0443 alcohol counseling (brief)
- G0444 depression s
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 2,989 tokens
We need answer a task: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code. Required key: "code"."

Need output JSON with exactly one key "code". Need know HCPCS Level II code for subsequent annual wellness visit (AWV) with personalized prevention plan. No reference material supplied; answer from what we know.

Let's recall HCPCS codes for Annual Wellness Visit (AWV) under Medicare.

Medicare covers Annual Wellness Visit (AWV) providing Personalized Prevention Plan Services (PPPS). There are two codes:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), first visit (initial AWV). Actually G0438 is "Annual wellness visit; includes a personalized prevention plan of service (PPS), initial visit" maybe? Wait.
- G0439: Annual wellness visit, includes a personalized prevention plan of service (PPS), subsequent visit.

Let's verify: HCPCS Level II codes for AWV:
G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

Yes, G0438 is initial annual wellness visit (first AWV) for new patient. G0439 is subsequent annual wellness visit (after the first one, i.e., subsequent AWV). The question says "subsequent annual wellness visit with a personalised prevention plan." So code is G0439.

Need ensure spelling: "personalised" in question but code descriptor uses "personalized prevention plan of service" or "personalized prevention plan services (PPPS)". The code G0439 is "Annual wellness visit; includes a personalized prevention plan of service (PPS), subsequent visit". Wait there is nuance: The acronym is PPPS or PPS? Let's recall exact HCPCS descriptors.

From CMS: 
G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

Actually it might be "personalized prevention plan of service (PPPS)". Let's recall Medicare claims processing manual. Annual Wellness Visit (AWV): Healthcare Common Procedure Coding System (HCPCS) codes G0438 (initial AWV) and G0439 (subsequent AWV). Both include "a personalized prevention plan of service (PPPS)". Wait acronym maybe "Personalized Prevention Plan Services (PPPS)". Let's check memory: "Annual wellness visit (AWV) providing Personalized Prevention Plan Services (PPPS)" is listed with codes G0438 and G0439. The descriptor: "Annual wellness visit; includes a personalized prevention plan of service (PPS), initial visit" or "PPPS"? Let me think.

The Affordable Care Act created "annual wellness visit providing personalized prevention plan services". The HCPCS code descriptors: 
G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit.

But I've also seen: 
G0438: Annual wellness visit; includes a personalized prevention plan of service (PPS), initial visit. 
G0439: Annual wellness visit; includes a personalized prevention plan of service (PPS), subsequent visit.

Let's search memory: In HCPCS, the description for G0438: "Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit". Wait maybe the official descriptor is:
G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

Let's verify through memory of billing guidelines: The codes are:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
- G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit
Used for Medicare Part B. The initial AWV is when a beneficiary has not received an initial preventive physical examination (IPPE) or AWV previously; subsequent AWV is after the first AWV (or after IPPE? Actually subsequent AWV is any AWV after the first AWV. The first visit may be IPPE (G0402) then initial AWV G0438 once, then subsequent G0439 every year. Wait: There's also the "Initial Preventive Physical Examination" (IPPE) code G0402 (Welcome to Medicare preventive visit). Then the first Annual Wellness Visit is G0438 (initial AWV), then subsequent AWVs are G0439.

Question: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." It explicitly says "subsequent annual wellness visit". Therefore G0439.

Need make sure no modifier? It says single HCPCS Level II code. HCPCS Level II codes are alphanumeric starting with letter. G0439 is Level II? Actually HCPCS Level I is CPT (5-digit numeric). Level II is alphanumeric (starting with A-V, etc.). G codes are Level II HCPCS. Yes, G0439 is HCPCS Level II. Not CPT.

Need output JSON exactly with one key code and value "G0439". Check formatting: The task requires: Report codes exactly as they are written in the code set, including decimal point where code set uses one. HCPCS G0439 has no decimal point. It's just G0439. It includes four digits after G? G0438, G0439: G 0 4 3 9. So code is "G0439". Need JSON:
{
  "code": "G0439"
}

Wait, is there any possibility the code is G0439 or G0402? Let's examine details: "subsequent annual wellness visit with a personalised prevention plan". There is also "Annual wellness visit, subsequent" code G0439. Yes.

"Medicare Advantage member" - Medicare Advantage plans are managed care; they still use HCPCS/CPT codes for claims? But for encounter data, they report HCPCS. AWV codes are G0438/G0439. It says subsequent AWV, so G0439. Not "G0438" (initial). Not "G0402" (Welcome to Medicare IPPE, initial preventive physical exam). 

Let's ensure no hyphen or space: "G0439". Should we include as string? Yes, JSON string.

Need check if "personalised prevention plan" is "personalized prevention plan services (PPPS)" and maybe the code descriptor is "Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit". Yes.

Let's double-check HCPCS code set: G0439. From CMS HCPCS: 
G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit

Actually wait! There's also a code for "Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit" is G0439. There is also G0402 for "Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of Medicare enrollment". Not AWV.

Also, for a "subsequent annual wellness visit" after the "initial annual wellness visit", Medicare uses G0439. If the member had IPPE (Welcome to Medicare) within first 12 months, then the first AWV (initial AWV) is G0438, and any subsequent AWV is G0439. The question: "subsequent annual wellness visit" implies G0439.

Let's reflect on the phrase: "with a personalised prevention plan". The descriptor includes "includes a personalized prevention plan of service". So yes.

Need to output exactly one fenced JSON code block and nothing else. The output contract says exactly:
```json
{ ... }
```
Wait the example shows:
```json
{ ... }
```
Need use a fenced code block with json. Inside the block, the JSON object. So final answer should be:

```json
{
  "code": "G0439"
}
```

But let's verify: They say reply with exactly one fenced JSON code block and nothing else. No preamble, no commentary before or after, no second code block. So start with ```json and end with ```. Inside, JSON. Use two spaces? Not relevant. Ensure no trailing comma. Use null if empty, not needed.

One more check on decimals: G0439 has no decimal. Yes.

Potential trick: G0439 is "Annual wellness visit; includes a personalized prevention plan of service (PPS), subsequent visit" vs G0438 initial. The question says "subsequent annual wellness visit". So code G0439. Good.

Let's also consider if there is a specific HCPCS Level II code for "subsequent annual wellness visit with a personalized prevention plan" maybe "G0439" only. There is also "G0468"? No, G0468 is federal qualified health center (FQHC) visit for AWV? Wait, there is a code G0468: "Federal qualified health center (FQHC) visit, AWV". Let's recall. Actually there's HCPCS code G0468: "Federally qualified health center (FQHC) visit, annual wellness visit (AWV)". Not relevant; the question just asks assign the single HCPCS Level II code for a subsequent annual wellness visit with a personalized prevention plan. It doesn't say FQHC. So G0439.

Wait, in Rural Health Clinics (RHC) or FQHC, the AWV is bundled and they bill G0468 maybe? But no setting given.

Also, is there a code "S0620"? No, that's routine ophthalmological. "S0621"? No. The AWV codes G0438 and G0439 are HCPCS Level II (G codes are temporary? Actually G codes are Level II HCPCS). Yes.

Let's ensure "Medicare Advantage member" doesn't change code to a CPT code? For Medicare Advantage (Part C), providers bill the MA plan, not traditional Medicare, but MA plans require HCPCS/CPT codes. For AWV, MA plans cover AWV and use G0438/G0439 as well? Actually, one of the requirements: Medicare Advantage plans must cover "annual wellness visit" as Part B service? They follow original Medicare coverage. Yes, G0439.

Another nuance: There's a code "G0402" for the "Initial Preventive Physical Examination" (IPPE), also known as "Welcome to Medicare" visit. It does NOT include a personalized prevention plan? It includes review of medical/social history, education, etc. The AWV codes G0438/G0439 include PPPS. The question explicitly mentions "annual wellness visit with a personalised prevention plan" so it's AWV, not IPPE. And it's "subsequent" so G0439.

Double-check spelling of "personalized" vs "personalised". In code descriptor, it's "personalized" (American). The code doesn't change.

Let's prepare final answer.

Wait, need to consider if the code is "G0439" or "G0439 " etc. It's string "G0439".

Let's also think about whether "G0439" is the code for "subsequent annual wellness visit" or "subsequent AWV" includes PPPS. There is an "initial annual wellness visit" (G0438) and "subsequent annual wellness visit" (G0439). Yes.

Let's verify from actual HCPCS:
2014 HCPCS: 
G0438 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit.
G0439 - Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit.
Wait, I recall there was a revision: In 2011, descriptors: 
G0438: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit
G0439: Annual wellness visit; includes a personalized prevention plan of service (PPPS), subsequent visit
Yes.

Also, code G0446? No, that's intensive behavioral therapy for cardiovascular disease, annually. G0447 is intensive behavioral therapy for obesity. Not AWV.

Alright. Final output:

```json
{
  "code": "G0439"
}
```

Need ensure exactly one fenced JSON code block. I should not include any text before or after. The final message must be only that. The system wants no preamble. So final answer is the code block. 

Let's consider if "code" key must be capitalized? Required key: "code". So key is "code", value string. Yes.

One last thought: The instruction says "Report codes exactly as they are written in the code set, including the decimal point where the code set uses one. I10 has no decimal. E11.9 does. Do not add a decimal point that the code set does not use, and do not strip one that it does." G0439 has no decimal. Good.

Also, "Where a code carries a seventh character, include it." G0439 does not have seventh character. It's just five characters: G, 0, 4, 3, 9? Wait G0439 is 5 characters? Let's count: G (1), 0 (2), 4 (3), 3 (4), 9 (5). Actually it's a letter plus four digits = 5 characters. It's not like ICD-10-PCS with seventh character. No.

Okay final.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Kimi K2.6 · Moonshot11.9s · 269 out | 6.3s · 277 out | 1.1s · 163 out
Attempt 1
Reasoning · 252 tokens
The user is asking for a single HCPCS Level II code for a Medicare Advantage member who has a subsequent annual wellness visit with a personalised prevention plan.

This refers to the Annual Wellness Visit (AWV) codes in HCPCS Level II.

There are two main AWV codes:
- G0438: Initial Annual Wellness Visit; includes a personalized prevention plan of service (PPS), first visit
- G0439: Subsequent Annual Wellness Visit; includes a personalized prevention plan of service (PPS), subsequent visit

The scenario explicitly states "subsequent annual wellness visit with a personalised prevention plan." Therefore, the correct HCPCS Level II code is G0439.

I need to output exactly one fenced JSON code block with the key "code" and the value "G0439".

Let me double-check:
- HCPCS Level II code for subsequent annual wellness visit: G0439
- The prompt says "Assign the single HCPCS Level II code."
- Required key: "code"
- Value should be reported exactly as written in the code set. G0439 is correct.

No reference material is supplied, so I answer from what I know.

Output format:
```json
{
  "code": "G0439"
}
```
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 306 tokens
 The user is asking for a single HCPCS Level II code for a Medicare Advantage member who has a "subsequent annual wellness visit with a personalised prevention plan."

This is referring to the Annual Wellness Visit (AWV) codes under Medicare.

In HCPCS Level II, the codes for Annual Wellness Visits are:
- G0438: Initial annual wellness visit; includes a personalized prevention plan of service (PPS), first visit
- G0439: Subsequent annual wellness visit, includes a personalized prevention plan of service (PPS), subsequent visit

The scenario describes a "subsequent annual wellness visit with a personalised prevention plan." That maps exactly to G0439.

Key required: "code"
Value: "G0439"

No reference material was supplied, so I answer from what I know.

Output must be a single fenced JSON code block with no other text.

```json
{
  "code": "G0439"
}
```

Let me verify: G0439 is "Subsequent annual wellness visit, includes a personalized prevention plan of service (PPS), subsequent visit." Yes.

The user said "personalised" with British spelling but the code description uses American spelling "personalized" - this doesn't matter, it's clearly the same concept.

Answer: G0439.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 174 tokens
 The user wants a single HCPCS Level II code for a Medicare Advantage member having a subsequent annual wellness visit with a personalized prevention plan.

This sounds like the Annual Wellness Visit (AWV) codes in HCPCS Level II.

HCPCS codes for Annual Wellness Visit:
- G0438: Annual wellness visit; includes a personalized prevention plan of service (PPS), initial visit
- G0439: Annual wellness visit; includes a personalized prevention plan of service (PPS), subsequent visit

The user specifically says "subsequent annual wellness visit". So the code should be G0439.

Key required: "code"
Value: "G0439"

No reference material was supplied, so I answer from what I know.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100DeepSeek V4 Pro · DeepSeek1.4s · 93 out | 1.3s · 89 out | 2.9s · 163 out
Attempt 1
Reasoning · 76 tokens
We are asked: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." For a subsequent annual wellness visit (AWV), the HCPCS code is G0439. These are Medicare-specific codes: G0438 is initial, G0439 is subsequent. So answer: G0439.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 75 tokens
We are asked to assign a single HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalized prevention plan. The correct code is G0439. G0438 is for the initial visit. G0439 is for subsequent visits. The code is HCPCS Level II. So answer: code: "G0439".
json{ "code": "G0439" }
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 146 tokens
We are asked: "A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign the single HCPCS Level II code." Required key: "code". 

We need to recall or figure out the HCPCS code for a subsequent annual wellness visit (AWV) with a personalized prevention plan. In Medicare, the annual wellness visit has two codes: G0438 for the initial visit and G0439 for the subsequent visit. The description for G0439 is: "Annual wellness visit, includes a personalized prevention plan of service (PPS), subsequent visit". Since it's a subsequent visit, the code is G0439. 

Thus answer: {"code": "G0439"}
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100GPT-5.6 Luna · OpenAI1.2s · 38 out | 1.1s · 38 out | 0.9s · 38 out
Attempt 1
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100DeepSeek V4 Flash · DeepSeek1.9s · 132 out | 0.9s · 82 out | 4.7s · 103 out
Attempt 1
Reasoning · 117 tokens
We need answer HCPCS Level II code for annual wellness visit with personalized prevention plan. Medicare Advantage. Subsequent annual wellness visit. HCPCS G0438? Let's recall: HCPCS codes for Annual Wellness Visit: G0438 Annual wellness visit, includes personalized prevention plan of service (first annual wellness visit), G0439 Annual wellness visit, includes personalized prevention plan of service (subsequent annual wellness visit). So subsequent = G0439. Need JSON exactly {"code":"G0439"}? Required key code, value string. No reference material supplied, answer from knowledge.
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 74 tokens
We need answer HCPCS Level II code for annual wellness visit with personalized prevention plan. Medicare Advantage subsequent annual wellness visit. HCPCS G0439? Let's recall: Annual wellness visit, initial: G0438. Subsequent: G0439. HCPCS Level II. Need single code. Output JSON with key code.
json{"code": "G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 101 tokens
We need answer single HCPCS Level II code for subsequent annual wellness visit with personalized prevention plan. Medicare Advantage, subsequent annual wellness visit. HCPCS code G0438? Annual wellness visit; first. G0439 annual wellness visit; subsequent. Need assign single code. "subsequent annual wellness visit" => G0439. Need include exactly code. JSON {"code":"G0439"}. Ensure HCPCS Level II code.
json{"code":"G0439"}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100Claude Haiku 4.5 · Anthropic8.0s · 374 out | 4.7s · 259 out | 7.0s · 362 out
Attempt 1
Reasoning · 350 tokens
The user is asking for a HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalized prevention plan.

Let me think about what this service is:
- This is a Medicare annual wellness visit (AWV)
- It's a "subsequent" visit, meaning it's not the initial one
- It includes a personalized prevention plan (PPP)
- The patient is a Medicare Advantage member

The relevant HCPCS code for this service is G0438. 

G0438 is the code for "Annual wellness visit; includes a personalized prevention plan of care (as defined by the Affordable Care Act), initial visit"

Wait, but the question says "subsequent" annual wellness visit. Let me reconsider.

Actually, I need to check:
- G0438 is for the initial preventive physical examination (IPPE) and annual wellness visit (AWV) for Medicare beneficiaries, first visit
- G0439 is for the subsequent annual wellness visit

G0439 is the code for "Annual wellness visit; includes a personalized prevention plan of care, subsequent visit"

Since this is explicitly stated as a "subsequent" annual wellness visit with a personalized prevention plan, the correct code should be G0439.

Let me verify this is correct:
- G0438 = initial annual wellness visit with PPP
- G0439 = subsequent annual wellness visit with PPP

Yes, G0439 is the correct code for a subsequent annual wellness visit with a personalized prevention plan for Medicare Advantage members.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 235 tokens
This is a question about assigning a HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalized prevention plan.

In Medicare, the annual wellness visit (AWV) is covered under the preventive services benefit. The HCPCS Level II codes for annual wellness visits are:

- G0438: Annual wellness visit; includes personalized prevention plan services; first visit
- G0439: Annual wellness visit; includes personalized prevention plan services; subsequent visit

Since the prompt specifies this is a "subsequent annual wellness visit with a personalised prevention plan," the appropriate code would be G0439.

Let me verify this is correct:
- G0438 = first annual wellness visit
- G0439 = subsequent annual wellness visit

The prompt clearly states "subsequent annual wellness visit" so G0439 is the correct answer.

The code should be reported exactly as written, including any formatting. HCPCS Level II codes are alphanumeric, starting with a letter. In this case, G0439.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 339 tokens
The task is asking for a single HCPCS Level II code for a Medicare Advantage member's subsequent annual wellness visit with a personalized prevention plan.

Let me think about this. Medicare annual wellness visits are covered under Medicare Part B. The codes for annual wellness visits are:

For initial preventive physical examination (IPPE): G0438
For annual wellness visit (AWV): G0439

However, the task specifically mentions "subsequent annual wellness visit with a personalized prevention plan."

The relevant codes are:
- G0438: Annual wellness visit; includes a personalized prevention plan of care document, initial visit
- G0439: Annual wellness visit; includes a personalized prevention plan of care document, subsequent visit

Since this is described as a "subsequent annual wellness visit," the appropriate code would be G0439.

Let me verify this is correct:
- G0439 is a HCPCS Level II code (starts with G)
- It's for annual wellness visits
- It's specifically for subsequent visits (not the initial visit)
- It includes the personalized prevention plan

So the answer should be G0439.

Wait, let me double-check the format requirements:
- HCPCS Level II codes with G prefix don't typically have decimals
- I should report exactly as written in the code set
- G0439 is the correct code

The required key is "code", so my JSON should be:
```json
{
  "code": "G0439"
}
```
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
100DeepSeek V3.2 · DeepSeek1.9s · 16 out | 1.9s · 16 out | 1.3s · 16 out
Attempt 1
json{
    "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
json{
    "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
67Qwen3.8 Flash · Alibaba3.9s · 192 out | 2.3s · 152 out | 12.7s · 145 out
Attempt 1
Reasoning · 169 tokens
We need answer JSON only. Need identify single HCPCS Level II code for Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Need know HCPCS codes. Annual Wellness Visit: G0438 initial, G0439 subsequent. Personalized prevention plan maybe G0439 includes annual wellness visit subsequent with personalized prevention plan? Let's verify. Medicare AWV codes: G0438 Annual wellness visit, includes personalized prevention plan of service (PPPS), initial; G0439 subsequent, includes PPPS. There is also G0444 5-minute Medicare Health Risk Assessment? For Medicare Advantage, annual wellness visit subsequent personalized prevention plan code is G0439. Need output {"code":"G0439"} only fenced JSON. Ensure no extra.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 2
Reasoning · 129 tokens
We need answer a single HCPCS Level II code for Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Required key code. Need know HCPCS codes: G0438 is Annual Wellness Visit initial; G0439 subsequent AWV. Personalized prevention plan is part of AWV? HCPCS G0439 Annual wellness visit, includes provision of personalized prevention plan of services (PPPS), subsequent visit. So answer G0439. Need output JSON block only. Ensure key code string. Need maybe "G0439". No decimals. Need final only code block.
json{
  "code": "G0439"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0439",
      "ok": true,
      "present": true
    }
  ],
  "fabricated": false,
  "abstained": false
}
Attempt 3
Reasoning · 122 tokens
We need answer only JSON code block. User asks: A Medicare Advantage member has a subsequent annual wellness visit with a personalised prevention plan. Assign single HCPCS Level II code. Required key code. No reference supplied. Need know HCPCS codes for Annual Wellness Visit. Initial: G0385. Subsequent: G0386. Personalized prevention plan included? AWV codes include medical history review, personalized prevention plan. Subsequent annual wellness visit = G0386. Medicare Advantage same HCPCS. Need output {"code":"G0386"}. Ensure nothing else.
json{
  "code": "G0386"
}
Grader detail
json{
  "fields": [
    {
      "field": "code",
      "want": "G0439",
      "got": "G0386",
      "ok": false,
      "present": true
    }
  ],
  "fabricated": true,
  "abstained": false
}