HCPCS Code G0438: Initial Annual Wellness Visit billing guide

Key takeaways

HCPCS Code G0438 covers a patient’s first Annual Wellness Visit (AWV) under Medicare. The patient must have held Part B coverage for more than 12 months.

G0438 is billed only once per patient lifetime. Every AWV after that one uses G0439 instead.

The visit is free to patients when the provider accepts Medicare assignment. Adding a same-day E&M requires Modifier 25 and separate documentation.

Practice management software like Pabau can automate G0438 eligibility checks, documentation templates, and claim submission to reduce denials.

HCPCS Code G0438: what the initial annual wellness visit covers

HCPCS Code G0438 bills Medicare Part B for a patient’s first Annual Wellness Visit (AWV). The Centers for Medicare and Medicaid Services (CMS) lists it in HCPCS Level II, so it is a G-code and not a CPT code. It was created under Section 4103 of the Affordable Care Act (ACA) and took effect on January 1, 2011.

The official CMS descriptor reads: Annual wellness visit; includes a personalized prevention plan of service (PPPS), initial visit. That phrase carries four clinical obligations. You need a health risk assessment (HRA), a full medical and family history review, a prevention plan, and a set of preventive screenings.

Below you will find the eligibility rules, the G0439 distinction, 2026 reimbursement rates, the same-day E&M rules, and the documentation an audit asks for.

G0438 vs G0439: initial vs subsequent annual wellness visit

Choosing between G0438 and G0439 is the first decision on any AWV claim. Billing G0438 for a patient who already had an AWV is one of the most common over-billing errors. The table below compares both codes side by side.

G0439 is not limited to the same provider. If your patient had their initial AWV at another practice, you still bill G0439. Medicare tracks AWV history at the beneficiary level, not at the practice level. Claims management software that flags prior AWV history at the eligibility check catches this before the claim goes out.

Patient eligibility for G0438

Four conditions must all be true before G0438 can be billed. Missing any one of them results in denial.

• Medicare Part B enrollment for more than 12 months. The patient must have been enrolled in Medicare Part B continuously for at least 12 months at the time of the visit. New Medicare enrollees are not yet eligible.
• No prior AWV on record. The patient must never have received an Annual Wellness Visit under Medicare. Any prior G0438 or G0439 claim disqualifies this code.
• No Welcome to Medicare visit (G0402/IPPE) within the prior 12 months. If the patient received the Initial Preventive Physical Examination (IPPE) in the preceding 12 months, G0438 cannot be billed until that window clears.
• Provider accepts Medicare assignment. When assignment is accepted, the AWV is provided at no cost to the patient (no copay, no coinsurance). If a same-day medically necessary E&M is also billed, the patient may owe cost-sharing for that separate service.

Practices using wellness clinic software with Medicare eligibility verification can surface all four conditions at scheduling. Checking then, rather than at billing, removes the most common G0438 eligibility denials.

G0438 vs G0402: annual wellness visit vs Welcome to Medicare

Many practices and patients confuse the AWV with the IPPE (G0402). They serve different purposes and cover different populations. Sequencing matters too. A patient who received an IPPE cannot have a G0438 within the following 12 months. Once that window expires, G0438 is billable.

Required components of the annual wellness visit

CMS requires specific clinical elements to be completed and documented before G0438 can be billed. A visit that omits any mandatory component is not a billable AWV, regardless of the time spent with the patient. Practices using standardized medical forms for each visit element reduce the risk of an incomplete record.

• Health Risk Assessment (HRA). A structured questionnaire completed by the patient (or with assistance) covering self-reported health status, functional ability, fall risk, psychosocial needs, and behavioral health history.
• Medical and family history review. Current conditions, surgeries, hospitalizations, and a first- and second-degree family medical history. A hereditary risk found here may warrant a referral for genetic counseling, billed under S0265.
• List of current providers and suppliers. Documentation of all clinicians currently involved in the patient’s care and all current medications, including supplements.
• Baseline measurements. Height, weight, BMI, blood pressure, and other routine vitals relevant to the patient’s risk profile.
• Cognitive assessment. Screening for cognitive impairment; the provider must document the assessment method used.
• Depression screening. A validated screening tool such as the PHQ-2 or PHQ-9 must be applied and the results documented.
• Personalized Prevention Plan of Service (PPPS). A written plan individualized to the patient. It covers a 5-to-10-year schedule of preventive services, an advance care planning discussion where applicable, and any referrals. Where a relative provides day-to-day support, a caregiver care plan documents that side of it.

Documentation requirements for G0438

Documentation failures account for a significant share of G0438 claim denials. The RAC audit program’s CMS-approved topic 0028 specifically targets AWV excessive units and inadequate documentation. Your medical record must contain each of the following to withstand an audit.

• Completed HRA form with patient responses or provider-assisted entries
• PPPS document, individualized and dated for this visit
• Cognitive impairment screening results with the tool name recorded
• Depression screening results with the validated tool name and score
• Blood pressure, BMI, and vitals recorded at this visit
• List of current medications and providers reviewed and updated
• Provider attestation confirming all required AWV elements were completed

Practices that use digital intake forms tied to structured clinical templates can auto-populate most of these fields. Patient-completed questionnaires cut the documentation load on clinicians and reduce the risk of missing a required element.

How to bill G0438: step by step

Billing G0438 follows a defined sequence. Skipping or misordering any step introduces denial risk. Practices that run scheduling and billing from the same primary care software can automate most of these steps.

1. Confirm eligibility before the visit. Verify Medicare Part B enrollment duration, confirm no prior AWV on file, and check for a recent IPPE. Use your clearinghouse or payer portal for real-time eligibility verification.
2. Complete all required AWV elements during the visit. That means the HRA, the cognitive assessment, the depression screening, vitals, the medication review, and the PPPS. Do not bill G0438 if any mandatory element was skipped.
3. Select G0438 as the primary HCPCS code. Do not add a CPT E&M code (such as 99213 or 99214) unless a medically necessary, separately identifiable service was also provided.
4. Attach companion ICD-10 diagnosis codes. Use Z00.00 (general adult medical exam without abnormal findings) or Z00.01 (with abnormal findings) as the primary diagnosis. Additional Z codes for specific screenings performed may be added.
5. Append Modifier 25 only when a same-day E&M is billed. If you bill a medically necessary E&M on the same date, append Modifier 25 to the E&M code. Separate, distinctly documented clinical findings must support it. The AWV itself does not use Modifier 25.
6. Submit to Medicare Part B. Bill to the patient’s Medicare Part B carrier. Place of service code 11 is typical for an office visit. Telehealth visits may use POS 02 with the applicable telehealth modifier.
7. Document any same-day E&M in its own note. If billing both G0438 and an E&M, that note must stand entirely on its own clinical content, with no reliance on the AWV documentation.

G0438 reimbursement rate and fee schedule 2026

Medicare reimbursement for G0438 varies by geographic locality. The national average for 2026 falls in the range of $170 to $180 for the initial AWV. Always verify your local rate with the CMS Physician Fee Schedule lookup tool. Rates are adjusted by geographic practice cost indices (GPCI) and updated each year in the fee schedule final rule.

Rates above reflect national averages and are subject to locality adjustments. Practices in high-cost urban markets typically receive higher rates. Rural practices may receive lower rates, or draw on rural health clinic supplemental payments. Confirm your own rate each January, once CMS publishes the final fee schedule.

Same-day billing: can you bill G0438 with an E&M visit?

Yes, in certain circumstances. CMS permits billing a medically necessary Evaluation and Management (E&M) service on the same date as G0438. The rules are strict, and RAC auditors look closely at these pairings.

The E&M service must be:

• Medically necessary and clearly distinct from the AWV’s preventive scope
• Separately documented in the medical record with its own clinical note, distinct from AWV documentation
• Appended with Modifier 25 on the E&M code to indicate a significant, separately identifiable service was performed

Two scenarios qualify often. The first is a patient raising an acute complaint during the visit, such as a new skin lesion that needs assessment. The second is a positive depression screen that leads into a fuller psychiatry interview and clinical decision-making.

CMS RAC approved topic 0028 targets AWV excessive units, including inappropriate same-day E&M pairings. If your documentation does not clearly separate the two services, the E&M claim will be denied. Both notes are held to the same privacy and retention standards as any other record under HIPAA.

Who can perform and bill G0438?

Physicians, nurse practitioners, physician assistants, and clinical nurse specialists enrolled with Medicare can all perform and bill the AWV. Incident-to billing situations vary. Confirm edge cases with your Medicare Administrative Contractor (MAC), especially shared visits and supervision requirements.

• Physicians (MD, DO) in any specialty, though primary care settings are most common
• Nurse Practitioners (NPs) credentialed and enrolled with Medicare
• Physician Assistants (PAs) enrolled with Medicare and practicing within their scope
• Clinical Nurse Specialists (CNS) with Medicare enrollment
• Other licensed healthcare professionals may perform portions of the AWV under direct supervision, such as nursing staff completing the HRA. The billing provider must review and attest to all completed components

The AWV does not require a physician. A fully credentialed NP or PA can complete the visit and bill G0438 under their own NPI. All required elements still have to be completed and documented.

Common G0438 billing errors and how to avoid them

The following mistakes appear repeatedly in Medicare AWV audits and claim denials. Most are preventable with the right billing system configuration and a short staff briefing.

Companion ICD-10 codes for G0438

Every G0438 claim requires at least one supporting ICD-10-CM diagnosis code. CMS requires the diagnosis code to reflect the reason for the visit. For a standard AWV with no acute findings, Z00.00 is the correct primary code. When the visit uncovers abnormal findings that are documented and addressed, Z00.01 applies instead.

Only attach additional Z codes for screenings that were performed and documented at this visit. Do not default-add screening codes without matching documentation. The AAPC HCPCS code database lists the code ranges, and the CMS annual wellness visit page covers how CMS treats AWV diagnosis coding.

How practice management software supports G0438 billing

Most AWV denials come from workflow breakdowns rather than coding knowledge. Coders know the rules. Three things tend to go wrong instead.

• The eligibility check never happened at scheduling.
• Nothing prompted the HRA during the visit itself.
• The PPPS ended up in a free-text note that an auditor cannot follow.

Practice management software like Pabau closes all three. With automated billing workflows, you set rules that fire at the right point in the visit.

• Trigger an AWV eligibility check as soon as an AWV appointment type is booked.
• Block G0438 when a prior AWV claim already sits on the patient’s record.
• Prompt for Modifier 25 when an E&M code is submitted alongside G0438.

Pabau also supports structured AWV documentation templates, clearinghouse submission, and real-time eligibility verification. For practices running high volumes of preventive visits, that cuts administrative time per visit. It also helps them keep AWV revenue that leaks out through avoidable billing errors.

Related HCPCS codes

• HCPCS code G0155 — Clinical Social Worker Home Health Billing
• HCPCS code G0442 — Medicare alcohol misuse screening
• HCPCS Code G0447 — Behavioral counseling for obesity

Automate your Medicare AWV billing workflow

Pabau helps primary care and wellness practices verify G0438 eligibility, complete structured AWV documentation, and submit claims to Medicare Part B, all from one platform.

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Conclusion

G0438 can only be billed once for each patient, so a wrong code choice is rarely fixed by a resubmission. That makes the pre-visit eligibility check the highest-value step in the whole workflow. Confirm the Part B enrollment date, the AWV history, and any IPPE in the past 12 months before the patient arrives.

Everything after that follows from documentation. Capture the HRA, the screenings, and the PPPS as structured fields rather than free text. The claim and the audit trail then build themselves while the visit happens, instead of afterwards.

Pabau builds those checks into scheduling, charting, and claim submission. Book a demo to see how it handles Medicare AWV workflows from booking through to payment.

Continue your research

Need a structured approach to Medicare billing compliance? HIPAA compliance for medical offices outlines the documentation and privacy rules that intersect with AWV billing workflows.

Billing a behavioral health screening on its own? H0002 walks through how that screening is coded when it sits outside the wellness visit.

Need a structured history-taking form? endocrine review of systems gives you a ready-made review sheet to attach to the visit record.

Looking for templates to support AWV documentation? Medical forms at your healthcare practice explains how standardized digital forms improve documentation completeness for preventive visit coding.

Frequently asked questions