Annual wellness visit billing: G0402, G0438, and G0439.
Three HCPCS codes cover Medicare's preventive visit family, and every one of them is gated by a calendar rule that generates a predictable denial when it's billed out of order. This guide covers the sequencing logic between G0402, G0438, and G0439, the health risk assessment and prevention plan components that actually decide whether the visit meets its own coverage requirement, and how to combine an AWV with a same-day problem visit without either service contaminating the other's documentation.
Key takeaways
- G0402, G0438, and G0439 are gated by three different clocks — Part B enrollment date, a 12-month clearance from any prior G0402, and 11 full months since the last AWV — and mixing them up is the single most common denial in this code family.
- G0438 doesn't require G0402 first — but if the patient did have a G0402, G0438 can't be billed until a full 12 months has passed since that visit.
- The AWV is not a physical exam — it's a defined health risk assessment and personalized prevention plan. A thorough visit that skips one HRA component still fails the coverage requirement even though the clinical care was sound.
- Modifier 25 on a same-day problem visit only survives audit if the E/M note stands on its own without the AWV's preventive content baked into it — covered in full in our internal medicine modifiers guide.
The three-code family, side by side
| Code | Service | Frequency | Gate |
|---|---|---|---|
G0402 | Initial Preventive Physical Examination ("Welcome to Medicare" visit) | One-time only | Must occur within the first 12 months of Part B enrollment |
G0438 | Initial Annual Wellness Visit | Once per lifetime | Requires at least 12 months of Part B coverage; if the patient had a G0402, at least 12 months must have passed since that visit |
G0439 | Subsequent Annual Wellness Visit | Annual | Requires an initial AWV (G0438) on record, and at least 11 full months since the last AWV (G0438 or a prior G0439) |
All three require a health risk assessment and a personalized prevention plan; none of them is a covered service if billed as a traditional physical exam with the HRA and prevention-plan components skipped, even when the visit itself was clinically thorough.
G0402: the Welcome to Medicare visit
G0402 is one-time, has to fall inside the first 12 months of Part B enrollment, and is genuinely optional — a patient who never receives it isn't blocked from anything downstream. Where it matters operationally is what it does to the G0438 clock: if the patient had a G0402, the initial AWV can't be billed until a full 12 months has passed since that visit, calculated from the actual date of service, not the calendar month. A G0438 billed 10 months after a patient's G0402 denies as premature, even though the patient has been on Part B far longer than 12 months in total.
G0438 vs. G0439: sequencing and the two denial patterns
The two failure modes here account for most of this code family's denials, and both are sequencing errors rather than documentation problems.
- G0439 is defined as the subsequent visit; a payer's claims history has to show a prior G0438 before a G0439 processes.
- Happens most often with a patient new to the practice whose AWV history the office never confirmed — the patient "seems due" for an annual visit, but no G0438 exists anywhere on record, including at a prior practice.
- G0439 requires 11 full months since the patient's last AWV, measured from the actual date of service — not the anniversary month, and not "it's been about a year."
- A practice that schedules annual visits by calendar month rather than by the prior visit's exact date routinely clips this window by a few days, which is enough to deny the claim.
Both patterns share the same fix: confirm the patient's actual AWV and IPPE history — including visits billed anywhere, not just at your practice — before scheduling what looks like a routine annual visit. A payer's own claims history is the source of truth here, not the patient's recollection or your EHR's internal record alone, since a patient who transferred practices may have a G0438 your system has never seen.
Required components: the health risk assessment and prevention plan
A shortened in-house version of the HRA that skips one component is the quiet reason an AWV fails audit even though the visit happened and was clinically sound. The components below apply to G0438 and G0439; G0402 has its own, separate examination content.
- 1Health risk assessment. Demographic data, self-reported health status, psychosocial and behavioral risk factors, and activities-of-daily-living/instrumental-ADL functional status, each with a validated screening tool result where one applies.
- 2Cognitive assessment. Required starting with the initial AWV — a brief structured screen for signs of cognitive impairment, not a full neuropsychological workup, but its performance and result have to be documented, not just implied by the visit having occurred.
- 3Personalized prevention plan. Built from the HRA: a screening schedule covering the next 5–10 years appropriate to the patient's age and risk factors, a list of risk factors and conditions with recommended treatment options, and a current list of the patient's other providers and suppliers of care.
Advance care planning (99497, plus add-on 99498 for each additional 30 minutes) billed on the same day as an AWV gets its deductible and coinsurance waived for that specific service — worth surfacing at scheduling, since it changes the patient's out-of-pocket exposure. Advance care planning billed on a different day, or alongside a problem-oriented E/M instead of the AWV, doesn't carry that same waiver.
Combining an AWV with a same-day problem-oriented E/M
Common and billable — append modifier 25 to the E/M — but the two services have to be kept genuinely separate in the note, or the claim reads as duplicative and denies even though both services were legitimately performed.
- Document the AWV's HRA, cognitive screen, and prevention plan as their own distinct section of the note.
- Document the problem-oriented E/M's history, exam, and MDM as content that would stand on its own if the AWV were removed entirely.
- Use distinct assessment-and-plan language for each service — a medication adjustment belongs in the E/M's plan, not folded into the prevention plan.
- Confirm the patient's actual AWV/IPPE history before scheduling, not after a claim denies.
- Don't let the AWV's history and risk-assessment content double as the E/M's history.
- Don't count time or MDM used to justify the AWV toward the E/M level as well.
- Don't bill G0439 or G0438 without confirming the frequency window from the actual prior date of service.
- Don't bill a commercial payer's preventive-visit code (typically from the 99381–99397 family) using the Medicare AWV HCPCS codes — they're not interchangeable.
The practical test before submitting: read the E/M portion of the note as if the AWV documentation didn't exist. If it still independently supports a billable level of history, exam, and MDM, modifier 25 is defensible. If the E/M note is really just a restatement of a finding that surfaced during the HRA, it isn't a separately identifiable service, and billing it as one is the exact pattern payers audit modifier 25 for.
Denial patterns and fixes
| Pattern | Why it happens | Fix |
|---|---|---|
| CO-151 frequency: G0439 billed too soon | Less than 11 full months since the last AWV, measured from actual date of service | Confirm the payer's own claims history for the exact prior AWV date; if the payer's date is wrong, appeal with the correct date, otherwise rebill once eligible |
| G0439 with no G0438 on record | Patient new to the practice, or the practice defaulted to the subsequent code without checking history | Bill G0438 instead if no initial AWV exists anywhere on record; confirm history across prior practices before scheduling, not after the denial |
| G0438 billed inside 12 months of G0402 | Practice scheduled the "annual visit" on the calendar-year anniversary rather than 12 months from the actual G0402 date of service | Rebill once the 12-month clearance from the G0402 date has actually elapsed |
| Modifier 25 denial on the same-day E/M | Payer system flags the two claim lines as duplicative because the note didn't clearly separate preventive content from problem-focused content | Resubmit with the note demonstrating the E/M's independent history/exam/MDM content; if the documentation genuinely doesn't separate the two, this is a correction, not an appeal |
| AWV denied as not covered (PR-204) on a commercial plan | Commercial payer billed with Medicare's AWV HCPCS codes instead of its own preventive-visit CPT code | Map each payer's preventive benefit to its own code set at enrollment; rebill under the correct code family for that plan |
Before scheduling any visit coded as an AWV, pull the patient's Medicare claims history — not just your own EHR — for the exact date of service of the last G0402, G0438, or G0439, from any billing practice. Every sequencing denial in this code family traces back to that date being assumed instead of confirmed, and it's a five-minute check that prevents a denial-and-resubmission cycle that otherwise costs far more staff time than the check itself.
Losing AWV revenue to sequencing denials?
We'll audit a sample of your recent AWV claims against each patient's actual Medicare visit history and show exactly which denials were preventable.
Frequently asked questions
Does a patient have to receive G0402 before they qualify for G0438?
No. G0402 (the Welcome to Medicare visit) is optional, and G0438 (the initial AWV) qualifies on its own once the patient has had Part B coverage for at least 12 months, whether or not they ever had G0402. The rule runs the other direction: if the patient did receive G0402, G0438 cannot be billed until a full 12 months has passed since that visit. Skipping G0402 entirely doesn't block G0438 or slow it down.
Can we bill an Annual Wellness Visit and a problem-oriented E/M on the same day?
Yes, with modifier 25 on the E/M, but the two services have to be documented as genuinely separate work. The AWV's health risk assessment, cognitive screen, and prevention plan can't double as the E/M's history or MDM, and the E/M's problem-focused assessment and plan can't recycle the AWV's content. The most common denial here isn't the modifier itself — it's a payer system flagging the two claim lines as duplicative because the note didn't clearly wall off preventive content from problem-focused content.
What happens if we bill G0439 before a G0438 is on file?
It denies as a frequency or sequence error. G0439 is defined as the subsequent visit and requires an initial AWV (G0438) on record first; a payer's claims history has to show a prior G0438 (or, for a patient who transferred practices, a G0438 billed anywhere) before a G0439 processes. The fix is confirming the patient's actual AWV history — including visits billed by a prior practice — before scheduling what your office assumes is a routine annual visit, rather than defaulting to G0439 because a year has passed since the patient's last preventive-sounding visit.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.