The Annual Wellness Visit is one of the most consistently under-billed services in internal medicine. The codes are not new, the documentation is well-defined, and Medicare reimburses reliably — yet most practices we audit are leaving real money on the table. Sometimes it is a missed depression screening on every AWV. Sometimes it is a same-day problem-focused visit that never had modifier 25 appended. Sometimes the AWV itself denies because the patient was 11 months and 28 days from their last one.
This post walks through the AWV rules the way an IM billing manager needs to see them: which code applies when, where the bundling traps are, what auditors actually check, and the five denial patterns that show up over and over.
AWV codes — IPPE, initial AWV, subsequent AWV (what’s what)
There are three distinct Medicare wellness codes, and using the wrong one is the most common rookie error on the back end.
- G0402 — Initial Preventive Physical Exam (IPPE), the “Welcome to Medicare” visit. One-time only, and only within the first 12 months of Part B enrollment. Miss the window and the patient is never eligible for it again.
- G0438 — Initial AWV. Billed once per beneficiary, the first AWV performed after the 12-month IPPE window has closed. Reimbursement runs around $170 under the current Medicare Physician Fee Schedule (verify against your locality).
- G0439 — Subsequent AWV. Every AWV after the initial one, and the workhorse code for any established Medicare panel. Reimbursement is roughly $112. This is the code you will bill most often.
A common mistake is billing G0438 a second time because a patient transferred in from another practice. G0438 is patient-lifetime, not practice-lifetime. If they had an initial AWV anywhere in the country, you are billing G0439 going forward.
The 12-month rule that drives the most denials
Medicare allows one AWV per 12-month period. The critical detail: it is measured 365 days from the prior AWV date of service, not calendar year. A patient seen on March 3, 2025 is not eligible again until March 3, 2026 — not January 1.
This trips up two scenarios constantly:
- The eager rescheduler. Patient calls in February wanting their annual “early” because they are traveling in March. If you book them at 11 months and 20 days, the claim denies.
- The new patient onboarding. The patient swears they have not had a wellness visit. They had one at their old PCP eight months ago. The HETS eligibility response will tell you — but only if your front desk actually pulls it.
The fix is operational, not clinical. Build a pre-scheduling check into your workflow that pulls the next-eligible AWV date from Medicare eligibility before the appointment is offered. We typically see denial rates on AWV drop by half once this step exists.
Same-day E/M + AWV — modifier 25 is the entire game
Here is the scenario that plays out in every IM practice every week: the patient comes in for their AWV, and during the visit the provider also manages their hypertension, adjusts a statin, refills three meds, and addresses a new shoulder complaint. That is two distinct services. You are entitled to bill both — but only if you do it right.
Without modifier 25, Medicare bundles the problem-focused E/M into the AWV and you get paid for the AWV only. With modifier 25 appended to the E/M code (99213, 99214, etc.), you unlock separate reimbursement for the additional work.
What auditors look for to support modifier 25:
- A separately identifiable, medically necessary E/M service
- Documentation that distinguishes the problem-focused work from the AWV elements
- A linked diagnosis on the E/M line that is distinct from Z00.00 (the AWV diagnosis)
- Evidence the problem required work above and beyond the preventive screening
A clean example: a 68-year-old comes in for her G0439. Her home BP log shows readings of 158/94. The provider reviews the log, adjusts her amlodipine from 5 mg to 10 mg, orders a basic metabolic panel, and counsels on dietary sodium. That is a 99214 with modifier 25, linked to I10. The AWV elements (HRA, prevention plan, cognitive assessment) are documented separately under G0439 with Z00.00. Two services, one visit, full reimbursement.
The depression screening add-on (G0444) almost everyone forgets
G0444 is the single most under-billed add-on in Medicare wellness. It pays around $14, requires a 15-minute minimum, and it can only be billed on the same claim as G0438 or G0439 — never standalone, never with G0402.
If your AWV template already includes a PHQ-9 or PHQ-2 administration (and it should), you are doing the work. The question is whether you are capturing the code.
Run the math on your own panel. A two-provider IM practice doing 200 AWVs a year that systematically misses G0444 is leaving roughly $2,800 on the table. A six-provider practice doing 600 is at $8,400 — every year, on work already being performed. That is real money for a code that requires no additional clinical effort, only a checkbox in the billing workflow.
Other AWV add-on codes most practices under-bill
G0444 is the most common miss, but it is not the only one. The full add-on stack worth knowing:
- G0442 — Alcohol misuse screening, 15 min. One per year. Bundles cleanly with AWV.
- G0443 — Brief alcohol counseling, 15 min. Up to four sessions per year if G0442 is positive.
- G0446 — Intensive behavioral therapy for cardiovascular disease. One per year for eligible patients.
- G0447 — Obesity behavioral counseling. Up to 22 visits per year for patients with BMI ≥ 30. This one alone can transform the economics of obesity management in a primary-care panel.
- 99497 / 99498 — Advance Care Planning. When billed with an AWV on the same date, the patient cost-share is waived. That makes ACP much easier to have because the patient is not being charged for the conversation.
Worth saying plainly: do not bill any of these without documentation that supports the time and content. But if the work is being done, the code should follow. Most practices are already doing the work — the gap is in the capture, not the care. That is the same theme we see across revenue cycle management generally: the dollars are usually in services already delivered but never billed cleanly.
Documentation requirements (what auditors check)
Medicare’s AWV documentation requirements are specific. An audit will check for each element. If any of these are missing, the AWV can be recouped on review:
- Health Risk Assessment (HRA). Patient-completed or staff-administered, covering demographics, health status, behavioral risks, and ADL/IADL screening.
- Personalized prevention plan. Written, given to the patient, addressing the findings from the HRA. This is the deliverable the patient walks out with.
- Cognitive assessment. Mandatory at every AWV. Mini-Cog, GPCOG, or another validated tool. This is the most commonly missing element in audited charts.
- Functional ability and safety screening. Hearing, vision, fall risk, home safety.
- Add-on screening documentation. If you billed G0444, the PHQ-9 result and time spent must be in the chart. Same for G0442 (AUDIT-C or similar) and any behavioral counseling code.
Build a dot phrase or template that walks the provider through every element in the same order every time. The cognitive assessment is the one that gets skipped most often when providers are pressed for time, and it is the one auditors find fastest.
Top 5 AWV denial patterns and the fix for each
- AWV billed within 12 months of prior AWV. Fix: run a 365-day eligibility check against HETS before the appointment is booked, not at check-in.
- Same-day E/M billed without modifier 25. Fix: append modifier 25 to the E/M code, with a distinct diagnosis from the AWV (Z00.00). Train coders to flag any AWV claim with an unmodified E/M for review before drop.
- AWV billed as preventive medicine code (99381–99397). Fix: Medicare requires the G-codes (G0402, G0438, G0439). Commercial preventive CPTs deny under Medicare every time. Lock the AWV order set to the G-codes only.
- Depression screening (G0444) billed alone. Fix: G0444 must be on the same claim as the AWV. If your EHR drops G0444 on a separate encounter, fix the encounter setup or the claim scrubber rule.
- Missing cognitive assessment in documentation. Fix: a dot phrase or template prompt that requires a cognitive screen result before the note can be signed. No screen, no AWV bill.
How this fits in the broader IM revenue picture
AWVs are one slice of the IM coding stack, but they are an instructive one. The codes are public, the rules are documented, the reimbursement is reliable — and most practices are still under-capturing because the operational workflow has gaps the clinicians cannot see from inside the exam room. The fix is rarely clinical. It is order sets, scrubber rules, eligibility checks, and a coder who knows what modifier 25 unlocks.
For the full list of internal medicine codes and where the leakage tends to hide, our 2026 Internal Medicine CPT Cheat Sheet is the reference our clients keep open during weekly billing reviews. If your practice also handles post-discharge transitions of care, our deeper walk-through of Transitional Care Management billing and the 14-day rule covers another high-leverage Medicare line item most IM practices under-capture.
AMS Solutions has been doing medical billing since 1992 — 30+ years of internal medicine claims across more than 3 million submissions annually, with an AAPC-certified coding team holding a 95%+ clean claim rate, 30-35 day A/R, and under 6% denial rate. If your AWV capture is leaking and you would rather not rebuild the workflow yourself, our medical billing services include the full denial-prevention layer described above.
Want a second set of eyes on your current AWV billing pattern? Book a 30-minute call and we will walk through a sample month of your AWV claims and flag where the dollars are sitting.
