Mammograms | CMS Coverage Update

Summary: The Centers for Medicare & Medicaid Services modified its mammography coverage policy, effective May 15, 2026. Here's what billing teams need to know before that date.

CMS mammogram coverage policy changes affect every radiology group, women's health practice, and hospital outpatient department billing screening and diagnostic mammography to Medicare patients. This policy does not list specific CPT or HCPCS codes in the available data — but the change is real, the effective date is May 15, 2026, and your billing team needs to be ready.

Quick-Reference Table

CMS Mammogram Coverage Criteria and Medical Necessity Requirements 2026

The Centers for Medicare & Medicaid Services has long maintained two distinct mammography benefit categories under Medicare: screening mammography and diagnostic mammography. Each carries different coverage rules, different medical necessity requirements, and different billing pathways. This modification means you should not assume your current workflows still apply after May 15, 2026.

Screening mammography under Medicare Part B covers annual mammograms for women age 40 and older. For women ages 35–39, Medicare covers one baseline screening mammogram. No physician order is required for the screening benefit — but your documentation still needs to reflect the correct benefit category. Billing a diagnostic mammogram when a screening mammogram is appropriate (or vice versa) is one of the most common claim denial triggers in this space.

Diagnostic mammography has a different medical necessity bar. Coverage applies when a patient presents with signs or symptoms — a palpable lump, nipple discharge, breast pain, or a prior abnormal screening result, for example. The ordering physician's documentation must support why the diagnostic study was ordered. CMS scrutinizes this distinction closely, and MAC-level local coverage determination activity on mammography has increased over the past two years.

Whether mammography is covered under Medicare depends heavily on how the claim is coded and whether your documentation matches the benefit category billed. That alignment — documentation to code to benefit category — is where most billing errors occur, and it's exactly where this modified coverage policy will put pressure on your team.

Prior authorization is not required for most Medicare mammography claims under traditional fee-for-service. But Medicare Advantage plans follow their own rules, and many require prior auth for diagnostic mammography. If your patient mix includes Medicare Advantage, confirm the individual plan's requirements before May 15, 2026. Do not assume that what applies to traditional Medicare applies to Advantage.

Reimbursement for mammography under Medicare is tied to the Medicare Physician Fee Schedule for office and outpatient settings, and to the OPPS fee schedule for hospital outpatient departments. Screening and diagnostic mammography carry different payment amounts, which is another reason the distinction matters financially — not just administratively.

CMS Mammogram Exclusions and Non-Covered Indications

CMS does not cover mammography outside defined age and frequency parameters for the screening benefit. A screening mammogram billed for a patient under age 35 — except as the single baseline study available for ages 35–39 — will not be covered. Billing more than one screening mammogram within a 12-month period for a patient age 40 or older is another common denial scenario.

Bilateral diagnostic mammography billed without adequate supporting documentation is routinely denied. CMS expects clear clinical justification in the medical record. If the ordering provider's notes don't document signs, symptoms, or a prior abnormal result, the claim is at risk.

CMS also does not reimburse for mammography performed outside enrolled Medicare providers. If your facility or rendering provider is not properly enrolled in Medicare at the time of service, the claim will deny regardless of the clinical appropriateness of the study.

Coverage Indications at a Glance

The specific updated criteria from this modified policy are not detailed in the available policy data. The table below reflects established CMS mammography coverage rules. Verify against the full updated policy document at app.payerpolicy.org/p/cms/186-v1. before May 15, 2026.

CMS Mammogram Billing Guidelines and Action Items 2026

This is where most billing teams lose money on mammography — not from a lack of knowledge, but from letting workflow assumptions outlast policy changes. Act on these steps before May 15, 2026.

CPT, HCPCS, and ICD-10 Codes for Mammography Under CMS Policy

This policy does not list specific CPT, HCPCS, or ICD-10 codes in the available data. Do not use codes from other sources as a substitute for the actual policy — coding errors on mammography claims are a significant source of both denials and compliance risk.

Commonly Associated Mammography Codes (Not Confirmed by Policy Data)

The codes below are widely used for mammography billing under Medicare and are provided for reference only. Confirm which specific codes are governed by the updated policy by reviewing the full CMS document at app.payerpolicy.org/p/cms/186-v1.

Your coding team should not bill mammography codes based solely on this summary. Pull the full updated policy and confirm every applicable code before May 15, 2026. If your billing software uses code-specific coverage rules or edits, update those edits once you have the confirmed code list from CMS.

Mammography billing involves several code families — including 2D digital, 3D tomosynthesis, and CAD (computer-aided detection) add-on codes. Whether this modification affects all of those families or only specific ones is not determinable from the available policy data. That's a gap you need to close before the effective date.