Guide

Medicare's zero-cost-share preventive benefit — and the trap visits around it

Summary

Medicare waives the deductible and coinsurance on a defined set of preventive services — broadly wellness visits, a range of screenings, and certain vaccines. But which services qualify, and under what conditions, is set by coverage rules and annual rulemaking, so the dependable answer is a per-code check in the Medicare Coverage Database and the fee-schedule lookup, plus knowing the three ways a zero-cost visit quietly turns into a billable one.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

Why a list is the wrong thing to memorize

A memorized list fails for three reasons: the qualifying set changes through annual rulemaking, the cost-sharing waiver is conditional on eligibility and frequency, and the same service can be preventive in one context and diagnostic in another. The authoritative definition of the preventive benefit lives in CMS's Benefit Policy Manual, and the operative billing instructions live in the Claims Processing Manual 2Ref 2Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That CMS program instructions live in the public Internet-Only Manuals — including the Benefit Policy Manual, which defines covered benefits, and the Claims Processing Manual, which carries the billing instructions. — both public, both more current than any cheat sheet.

That is why this page teaches a check rather than reciting codes. When you look the annual wellness visit up by its own codes, G0438 and G0439, the fee-schedule lookup confirms how Medicare pays and statuses them for the current year 3Ref 3Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS publishes a public look-up tool where a clinician can find the payment amount and payment/status indicators for a CPT/HCPCS code, used here to confirm how a preventive code and any accompanying problem-oriented service pay.. Do that per service, per year, and you never bill last year's rule.

Trap one: the frequency limit

The most common way a covered screening generates a bill is timing. Many preventive services are covered only once within a defined interval, and a claim submitted before the interval resets is denied — with the cost potentially falling to the patient. The coverage database lists the frequency rule for each screening, so it is checkable before the visit, not after the denial 1Ref 1Centers for Medicare & Medicaid Services (2026).Medicare Coverage Database (MCD) Search.That whether Medicare covers a service, and the frequency and screening-versus-diagnostic rules attached to it, are coverage determinations searchable in the public Medicare Coverage Database — the lookup for a given preventive service's rule..

When you know a service may exceed its frequency limit but the patient wants it anyway, an Advance Beneficiary Notice of Noncoverage is how you tell them in writing beforehand and preserve your ability to bill them if Medicare declines 4Ref 4Centers for Medicare & Medicaid Services (2026).Beneficiary Notices Initiative (BNI).That the Advance Beneficiary Notice of Noncoverage is published under CMS's Beneficiary Notices Initiative, and that a valid ABN signed before the service is what lets a provider bill the patient when a service — such as one exceeding a frequency limit — is likely to be denied.. Without a valid ABN signed first, a frequency denial usually becomes a write-off, not a patient balance. The frequency check and the ABN are the same habit, one step apart.

Trap two: the preventive visit that grows a problem

A wellness visit is zero-cost-share for the preventive work — but the moment you also evaluate and manage an active problem in the same encounter, that problem-oriented portion is a separate, billable service that carries the patient's normal Part B cost-sharing and pays under the fee schedule 3Ref 3Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS publishes a public look-up tool where a clinician can find the payment amount and payment/status indicators for a CPT/HCPCS code, used here to confirm how a preventive code and any accompanying problem-oriented service pay.. The visit didn't stop being preventive; it grew a second service alongside it.

This is where the annual wellness visit gets mistaken for a physical: the AWV is not a physical, and it is not a place to quietly fold in problem management for free. The clean handling is to tell the patient at the start that anything beyond the wellness elements may carry their usual cost-sharing, document the two parts distinctly, and bill them as what they are — not to under-code the problem to keep the visit "free."

Trap three: screening that turns diagnostic

The third trap is that the same anatomical service can be preventive or diagnostic depending on why it was done and what was found — and that distinction moves the cost-sharing. A service ordered as routine screening may be waived, while the diagnostic version of the same service, ordered to work up a symptom or a finding, carries the patient's normal cost-sharing. The line between the two is a coverage determination, spelled out in the coverage record for that service 1Ref 1Centers for Medicare & Medicaid Services (2026).Medicare Coverage Database (MCD) Search.That whether Medicare covers a service, and the frequency and screening-versus-diagnostic rules attached to it, are coverage determinations searchable in the public Medicare Coverage Database — the lookup for a given preventive service's rule..

The practical failure is billing on autopilot: coding a service as screening because that is how it usually goes, when the visit was actually diagnostic. The reverse costs the patient money they didn't owe. Read the coverage record's screening-versus-diagnostic language for the specific service, and let the reason for the order drive the code.

When Medicare isn't the primary payer

The zero-cost-share rule describes how Medicare processes a preventive service — it does not override coordination of benefits. When the patient has other coverage that pays before Medicare, the claim flows through that primary payer first, and that payer's rules govern the patient's share; Medicare's waiver applies to Medicare's own processing, in its position in the order 5Ref 5Centers for Medicare & Medicaid Services (2026).Coordination of Benefits and Recovery Overview.That coordination of benefits determines which payer is primary versus secondary and that CMS runs the coordination process for Medicare — so a preventive service's cost-sharing depends on whether Medicare is actually the primary payer..

So before you promise a patient a service will be free, confirm Medicare is actually primary for them. Coordination of benefits determines the payer order, and CMS runs the coordination process that tracks it 5Ref 5Centers for Medicare & Medicaid Services (2026).Coordination of Benefits and Recovery Overview.That coordination of benefits determines which payer is primary versus secondary and that CMS runs the coordination process for Medicare — so a preventive service's cost-sharing depends on whether Medicare is actually the primary payer.. A preventive service that is zero-cost under Medicare-primary can look different when Medicare sits second behind an employer plan or another payer.

A per-visit check

You can clear all three traps with a short check run before the visit, each step tied to a public authority. It takes less time than reworking a denied claim or refunding a patient you overcharged.

Search the service in the Medicare Coverage Database for its coverage rule and frequency limit 1Ref 1Centers for Medicare & Medicaid Services (2026).Medicare Coverage Database (MCD) Search.That whether Medicare covers a service, and the frequency and screening-versus-diagnostic rules attached to it, are coverage determinations searchable in the public Medicare Coverage Database — the lookup for a given preventive service's rule..
Confirm its payment and status for the current year in the fee-schedule lookup 3Ref 3Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS publishes a public look-up tool where a clinician can find the payment amount and payment/status indicators for a CPT/HCPCS code, used here to confirm how a preventive code and any accompanying problem-oriented service pay..
If you also address a problem, expect the patient's normal cost-sharing on that portion and document the two parts separately 3Ref 3Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS publishes a public look-up tool where a clinician can find the payment amount and payment/status indicators for a CPT/HCPCS code, used here to confirm how a preventive code and any accompanying problem-oriented service pay..
If a frequency limit may be exceeded, get a valid ABN signed before the service 4Ref 4Centers for Medicare & Medicaid Services (2026).Beneficiary Notices Initiative (BNI).That the Advance Beneficiary Notice of Noncoverage is published under CMS's Beneficiary Notices Initiative, and that a valid ABN signed before the service is what lets a provider bill the patient when a service — such as one exceeding a frequency limit — is likely to be denied..
Confirm Medicare is the primary payer before telling the patient it is free 5Ref 5Centers for Medicare & Medicaid Services (2026).Coordination of Benefits and Recovery Overview.That coordination of benefits determines which payer is primary versus secondary and that CMS runs the coordination process for Medicare — so a preventive service's cost-sharing depends on whether Medicare is actually the primary payer..

Common questions

Yes. Medicare waives the deductible and coinsurance on a defined set of preventive services. Which services qualify, and under what conditions, is set by coverage rules and annual rulemaking, so confirm any specific service in the Medicare Coverage Database rather than relying on a general list.

Almost always because a second, billable service rode along with the preventive one. If you evaluated and managed an active problem during a wellness visit, that problem-oriented portion carries the patient's normal Part B cost-sharing. The wellness elements stay zero-cost; the added problem work does not.

Medicare denies a preventive service submitted before its frequency interval resets, and the cost can fall to the patient. If you know a service may exceed its limit, an Advance Beneficiary Notice of Noncoverage signed before the visit is what lets you bill the patient; without one, the denial usually becomes a write-off.

No. The annual wellness visit is a preventive planning encounter, not a head-to-toe physical exam, and folding problem management into it for free mis-codes the visit. Document the wellness elements and any problem work separately, and bill each as what it actually was.

Start in the Medicare Coverage Database for the coverage rule and any frequency limit, then check the physician fee-schedule lookup for how the code pays and statuses this year. The Benefit Policy Manual holds the underlying definition. Doing this per service beats memorizing a list that changes annually.

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References

1.Centers for Medicare & Medicaid Services (2026). Medicare Coverage Database (MCD) Search. Centers for Medicare & Medicaid Services (CMS). link ✓That whether Medicare covers a service, and the frequency and screening-versus-diagnostic rules attached to it, are coverage determinations searchable in the public Medicare Coverage Database — the lookup for a given preventive service's rule.
2.Centers for Medicare & Medicaid Services (2026). Internet-Only Manuals (IOMs). Centers for Medicare & Medicaid Services (CMS). link ✓That CMS program instructions live in the public Internet-Only Manuals — including the Benefit Policy Manual, which defines covered benefits, and the Claims Processing Manual, which carries the billing instructions.
3.Centers for Medicare & Medicaid Services (2026). Physician Fee Schedule Search. Centers for Medicare & Medicaid Services (CMS). link ✓That CMS publishes a public look-up tool where a clinician can find the payment amount and payment/status indicators for a CPT/HCPCS code, used here to confirm how a preventive code and any accompanying problem-oriented service pay.
4.Centers for Medicare & Medicaid Services (2026). Beneficiary Notices Initiative (BNI). Centers for Medicare & Medicaid Services (CMS). link ✓That the Advance Beneficiary Notice of Noncoverage is published under CMS's Beneficiary Notices Initiative, and that a valid ABN signed before the service is what lets a provider bill the patient when a service — such as one exceeding a frequency limit — is likely to be denied.
5.Centers for Medicare & Medicaid Services (2026). Coordination of Benefits and Recovery Overview. Centers for Medicare & Medicaid Services (CMS). link ✓That coordination of benefits determines which payer is primary versus secondary and that CMS runs the coordination process for Medicare — so a preventive service's cost-sharing depends on whether Medicare is actually the primary payer.

https://www.gale.care/for-providers/mc-medicare-preventive-zero-cost · 5 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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