G0438 vs G0439: How to Bill the Medicare Annual Wellness Visit

Three different HCPCS codes cover the Medicare wellness/preventive visit lifecycle, and choosing the wrong one is the root cause of most AWV denials. The decision is almost entirely about timing — how long the patient has had Part B, and whether they have ever had an AWV before.

How to read it in practice: If the patient is brand new to Medicare and still inside their first 12 months of Part B, the only wellness option is G0402 (IPPE). Once they pass 12 months of Part B and have never had an AWV, their first AWV is G0438. Every wellness visit after that — for the rest of their life — is G0439. There is no scenario in which a patient legitimately gets a second G0438. In our AWV audits, the highest-dollar recurring error we see is a practice billing G0438 every year out of habit, which denies as 'already billed' from year two onward and quietly caps the visit's revenue.

A frequent point of confusion: the IPPE (G0402) is not a prerequisite for the AWV. A patient can skip the IPPE entirely (many do, because they didn't know about it in year one) and still get a G0438 once they cross the 12-month Part B mark. The IPPE and the AWV are separate benefits.

The initial AWV is a structured, non-hands-on assessment — it is a prevention planning visit, not a physical exam. CMS specifies the required elements, and a claim that omits a required element risks denial or a documentation-driven audit takeback. The required components of G0438 are:

• A Health Risk Assessment (HRA) — self-reported or with caregiver input, covering health status, behavioral risks, activities of daily living, and psychosocial risks.
• Establish the patient's medical and family history.
• Establish a current list of providers and suppliers involved in the patient's care.
• Measure height, weight, BMI (or waist circumference), and blood pressure — and other routine measurements as appropriate. (Note: this is the limited set of vitals for the visit, not a head-to-toe exam.)
• Detect any cognitive impairment the patient may have, using direct observation and patient/caregiver report.
• Review potential risk factors for depression and other mood disorders, using an appropriate screening instrument.
• Review functional ability and level of safety, including hearing, fall risk, and activities of daily living.
• Establish a written screening schedule (a 5- to 10-year checklist) for appropriate preventive services.
• Establish a list of risk factors and conditions with interventions recommended or underway.
• Furnish personalized health advice and referrals to health education or preventive counseling.
• Furnish, at the patient's discretion, advance care planning (separately billable — see below).

The defining feature of G0438 is that it is performed once per lifetime and is the only AWV that establishes the baseline (full history, full screening schedule, full risk list). Because it is the most labor-intensive of the AWV codes, it carries the highest reimbursement of the three.

Providers allowed to furnish and bill the AWV include physicians (MD/DO), and qualified non-physician practitioners (NP, PA, CNS), as well as a team of medical professionals working under the direct supervision of a physician (for example, an RN or health educator performing much of the visit under a physician's supervision and billing).

G0439 is the maintenance version of the AWV. It reuses the baseline established at G0438 (or the prior G0439) and updates it rather than building it from scratch. The required components of G0439 are:

• Update the Health Risk Assessment (HRA).
• Update the patient's medical and family history.
• Update the list of current providers and suppliers.
• Measure weight (or waist circumference) and blood pressure, and other routine measurements as appropriate.
• Detect any cognitive impairment.
• Update the written screening schedule.
• Update the list of risk factors and conditions and the interventions recommended or underway.
• Furnish personalized health advice and referrals as appropriate.
• Furnish, at the patient's discretion, advance care planning.

The key billing rules for G0439:

1. Frequency: once per 12-month period. CMS measures this as 11 full months after the month of the last AWV. If the last AWV was in March, the next G0439 cannot be billed until at least the following March. Billing it early is the second-most-common AWV denial after the G0438-repeat error.
2. It is never the first AWV. If the patient has never had an AWV, you bill G0438, not G0439 — even if it is the patient's tenth year on Medicare. The 'initial' in G0438 refers to the first AWV, not the first year of coverage.
3. Same patient cost-sharing as G0438: no deductible, no coinsurance, when billed correctly with no problem-oriented service mixed in without a modifier.

In practice, the overwhelming majority of AWVs a busy primary care panel bills are G0439s — a patient has exactly one G0438 in their lifetime and then a G0439 every year after, so steady-state AWV volume is almost entirely G0439.

AWV payment is set under the Medicare Physician Fee Schedule (PFS) and adjusted by your geographic locality (GPCI), so the exact dollar amount varies by MAC and locality — verify the current allowable in your fee schedule rather than relying on a single national number. What is stable year to year is the relationship among the codes and the cost-sharing rules.

Why 'varies by MAC' is the honest answer on dollars: the PFS publishes a national, unadjusted amount, but the figure your practice actually receives is that national amount multiplied by your locality's work, practice-expense, and malpractice GPCIs, then the conversion factor. Two practices in different states bill the identical G0439 and are paid different dollar amounts. The reliable facts for 2026 are: (1) the AWV carries no Part B deductible and no coinsurance when billed clean, (2) G0438 pays more than G0439 because it includes the full baseline workup, and (3) the IPPE (G0402) is paid on its own line under the PFS. Pull your locality's allowable from the current MPFS Look-Up Tool for the exact dollars before quoting them to providers.

Revenue math that matters more than the per-visit dollar: the AWV's value is rarely the visit code alone. It is the legitimately separately billable services it surfaces — advance care planning (ACP), Chronic Care Management enrollment, and a same-day problem-oriented E/M when a real problem is addressed. A practice that bills the AWV but never captures the add-ons is leaving the larger share of the revenue on the table. The next sections cover those add-ons and the modifier discipline they require.

The single biggest patient-facing AWV problem is the word 'annual.' Patients hear 'Annual Wellness Visit' and expect a head-to-toe annual physical — and Medicare does not cover a routine annual physical exam at all. When a provider performs a full physical during what was scheduled as an AWV, the physical portion is non-covered and can generate an unexpected patient bill, which drives complaints and bad reviews.

The three are genuinely different visits:

• IPPE / 'Welcome to Medicare' (G0402) — a one-time preventive visit available only in the first 12 months of Part B. It includes vision screening, a limited physical (height, weight, BP, BMI), a review of risk factors, and end-of-life planning discussion. It is a one-shot benefit; miss the 12-month window and it is gone (the patient moves to the AWV track instead).
• Annual Wellness Visit (G0438 then G0439) — a prevention-planning visit with no comprehensive hands-on exam. It is about the HRA, the screening schedule, risk identification, and personalized advice. It can be billed every year (after the once-only G0438).
• Routine annual physical — a comprehensive head-to-toe exam (the kind a commercial plan covers). Medicare Part B does not cover this. If a patient wants and receives a full physical, it is either non-covered (patient pays) or the medically necessary, problem-oriented portion is billed as a separate E/M.

The operational fix is front-desk and provider scripting: explain to the patient up front that the AWV is a planning and prevention visit, not a physical, and that any problem the provider works up during the same visit may incur normal cost-sharing. Getting this right prevents the most common AWV patient-billing complaint.

An AWV and a problem-oriented E/M can legitimately be billed on the same day — the AWV covers prevention, the E/M covers a separately identifiable problem the provider actually worked up. But the E/M only gets paid if you append modifier 25 to the problem-oriented E/M code (not to the G-code). This is where a large share of AWV revenue is either lost or denied.

The rule: the AWV (G0438/G0439) has no deductible and no coinsurance. A separately billable E/M (e.g., 99213/99214) does carry normal cost-sharing. To bill both on the same date, the problem addressed must be significant and separately identifiable from the wellness assessment, documented as its own history/exam/MDM, and the E/M line must carry modifier 25.

The two failure modes:

1. Missing modifier 25. Bill G0439 + 99214 on the same day without modifier 25 and the E/M denies as bundled into the AWV (you will see a CO-97 / NCCI-bundling-style denial; see our 97 denial code explainer). The fix is to append modifier 25 to the E/M and resubmit a corrected claim.
2. Modifier 25 without a truly separate problem. Appending modifier 25 to an E/M that was really just part of the wellness conversation invites audit. The documentation must show a distinct, medically necessary problem worked up beyond the AWV elements. Payers (and Medicare especially) audit modifier 25 aggressively. See our modifier 25 guide for the documentation bar.

Patient-cost caveat: when you correctly add a modifier-25 E/M to an AWV, the AWV stays $0 but the patient now owes the deductible/coinsurance on the E/M portion. Tell the patient before the visit — a surprise E/M charge on a 'free' wellness visit is the second-most-common AWV complaint after the 'it wasn't a physical' complaint.

The AWV and Chronic Care Management (CCM, code 99490) are often confused because both are preventive-flavored, non-face-time-heavy primary care services. They are not the same and, critically, they are not mutually exclusive — the AWV is the ideal moment to enroll a qualifying patient into CCM.

The revenue logic: the AWV identifies the chronic conditions and risk factors; CCM is the recurring, monthly-billable service that manages them between visits. A practice that runs AWVs but never converts eligible patients into CCM is capturing a single annual code instead of a recurring monthly revenue stream plus the annual visit. For the full requirements, time thresholds, and documentation for CCM, see our chronic care management billing 99490 guide. Done right, the AWV becomes the front door to a far larger care-management program rather than a standalone once-a-year line item.

Almost every AWV denial traces to one of a handful of timing or modifier errors. Categorize the denial by the CARC on the 835 and route it to the matching fix.

The prevention play: the two highest-volume AWV denials (repeat G0438 and early G0439) are both eliminated by one front-end step — checking the date of the patient's last AWV at scheduling, via the Medicare eligibility response (HETS/MBI), and selecting the code from that date rather than from habit. An eligibility check that surfaces the last-AWV date converts the most common AWV denials into near-zero. This is exactly the discipline strong insurance eligibility verification builds into intake.

Use this checklist to bill the AWV clean and to capture the add-ons that make it worthwhile financially.

Before the visit (front desk / scheduling):

• Verify Part B is active and pull the date of the patient's last AWV from the eligibility response.
• If never had an AWV and 12+ months on Part B → plan G0438. If had a prior AWV and 11+ full months have passed → plan G0439. If in first 12 months of Part B → plan G0402 (IPPE).
• Send the Health Risk Assessment to the patient to complete ahead of time (saves visit time and satisfies the HRA requirement).
• Set expectations: this is a prevention-planning visit, not a physical, and any problem worked up may carry cost-sharing.

During / documenting the visit:

• Document every required AWV element (HRA, history, screening schedule, risk list, cognitive/depression/functional screens, personalized advice).
• If a separate problem is addressed, document it as a distinct history/exam/MDM to support a modifier-25 E/M.
• Offer advance care planning (ACP, 99497) — it is separately billable and the AWV cost-sharing waiver can extend to ACP furnished on the same day as the AWV when conditions are met.
• Identify patients with 2+ chronic conditions and offer CCM (99490) enrollment.

On the claim:

• Correct G-code (G0438 vs G0439 vs G0402) based on the last-AWV date — not habit.
• Modifier 25 on any same-day problem E/M (never on the G-code).
• Verify the rendering/supervising provider data is complete to avoid a CO-16.

Add-ons that legitimately stack with the AWV (each separately billable, with their own rules):

Working the AWV as a single G-code undersells it. Worked as a hub for ACP, a modifier-25 E/M when warranted, and CCM enrollment, it becomes one of the highest-ROI touchpoints on a primary care panel.