Mammograms — NCD 186 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 186 governing mammography coverage, effective March 7, 2026. Here's what your billing team needs to know.

CMS mammography coverage policy under NCD 186 draws a hard line between diagnostic and screening services — and that distinction drives everything about how you bill. The Centers for Medicare & Medicaid Services spell out age thresholds, frequency limits, and clinical criteria that determine whether a claim pays or denies. This policy does not list specific CPT or HCPCS codes in the current version, so your team needs to map coverage criteria to codes your practice already uses. Get that mapping right before March 7, 2026, or expect claim denial exposure.

Quick-Reference Table

CMS Mammography Coverage Criteria and Medical Necessity Requirements 2026

NCD 186 is the National Coverage Determination governing Medicare mammography coverage. It covers two distinct service types: diagnostic mammography and screening mammography. These are not interchangeable. Billing one when the patient qualifies for the other is a fast path to a claim denial — or worse, a medical necessity audit.

Diagnostic mammography applies to any man or woman who presents with signs and symptoms of breast disease, has a personal history of breast cancer, or has a personal history of biopsy-proven benign breast disease. A physician's interpretation must be included. Diagnostic mammography requires a physician order from a doctor of medicine or osteopathy as defined under §1861(r)(1) of the Act. No age restriction applies.

Three specific criteria trigger coverage for a diagnostic mammogram:

That third bullet gets missed. An asymptomatic patient can still qualify for a diagnostic mammogram if the ordering physician documents why they consider it appropriate. Document that judgment in the medical record. If it's not there, your claim won't survive a medical necessity review.

Screening mammography applies to women without signs or symptoms of breast disease. The purpose is early detection. CMS billing guidelines require that a screening mammogram include, at minimum, a two-view exposure of each breast — cranio-caudal and medial lateral oblique views. A single-view study does not meet the definition. That's not a clinical note, it's a coverage requirement.

Reimbursement for screening mammography follows strict age and frequency rules. CMS will not pay for a screening mammogram on a woman under age 35. Between ages 35 and 39, Medicare covers one screening mammogram. For women age 40 and over, Medicare covers one screening mammogram per benefit period — but only after at least 11 months have passed following the month of the last covered screening mammogram. Count months carefully. Billing before that 11-month threshold triggers a denial.

The policy does not mention prior authorization requirements for mammography under NCD 186. That does not mean prior auth is never required — your Medicare Administrative Contractor may have additional requirements. Check with your MAC before assuming prior authorization is never needed.

CMS Mammography Exclusions and Non-Covered Indications

This is where the policy creates real billing risk, because CMS is explicit about what does not qualify for Medicare payment — even when the service is clinically appropriate.

Routine screening mammography for asymptomatic women age 50 and over is considered medically appropriate by CMS. Read that again. CMS acknowledges the clinical appropriateness of this service. But it is not covered for Medicare purposes under the diagnostic mammography benefit.

The same applies to routine screening for asymptomatic women age 40 and over whose mothers or sisters have had breast cancer. CMS calls this medically appropriate. It still does not cover it under diagnostic mammography.

This is a real tension in the policy. CMS is telling you a service makes clinical sense — and then telling you Medicare won't pay for it under the diagnostic benefit. The path to coverage for these patients runs through the screening mammography benefit, subject to the age and frequency rules above. If you're billing diagnostic mammography for these patients because of family history alone, and there's no physician judgment documented under the third diagnostic criterion, those claims are vulnerable.

If you bill for patients in these categories and you're not certain how your documentation maps to NCD 186, talk to your compliance officer before the March 7, 2026, effective date.

Coverage Indications at a Glance

CMS Mammography Billing Guidelines and Action Items 2026

Mammography billing splits across two benefit types with different documentation requirements, different patient populations, and different frequency rules. Your charge capture and documentation workflow need to reflect that split clearly.

CPT, HCPCS, and ICD-10 Codes for Mammography Under NCD 186

Codes Listed in Policy Data

This policy update does not list specific CPT, HCPCS, or ICD-10 codes. NCD 186 defines coverage criteria for diagnostic and screening mammography without attaching specific billing codes to those criteria.

For mammography billing, your team will typically work with CPT codes in the 77000-series (digital mammography, tomosynthesis, and screening versus diagnostic designations). The appropriate code depends on the modality your facility uses and whether the service is diagnostic or screening — both of which are defined by NCD 186's coverage criteria above.

Cross-reference NCD 186 criteria against your current charge master. Map each active mammography CPT code to the diagnostic or screening definition it satisfies, and confirm your documentation requirements match. If you want specific code-to-criteria mapping reviewed, that's a conversation for your billing consultant or compliance officer — not something to improvise from the NCD alone.

Cross-reference also with the Medicare Benefit Policy Manual, Chapter 1 §50 and Chapter 15 §80, which CMS cites directly in NCD 186.