CPT code 77066: Diagnostic mammogram, bilateral, including CAD2026 Medicare rate & RVUs

Medicare pays $156.98 for 77066 nationally in the office. Local office rates run $138.55–$213.08.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 77066 covers

This service covers diagnostic mammographic imaging of both breasts, with computer-aided detection included when performed. It is commonly used to evaluate symptoms such as a palpable breast lump or nipple discharge, investigate a finding on a screening study, or assess a known breast abnormality. A radiologist interprets the images, typically in a breast imaging department, hospital, or outpatient imaging center.

Select this code when the diagnostic examination includes both breasts; use the unilateral code when only one breast is examined. The report should support the diagnostic reason and identify the bilateral study and its interpretation. CMS recognizes separately priced professional and technical components: modifier 26 identifies interpretation, modifier TC identifies equipment and staff, and no modifier represents the global service. The code is already priced bilaterally, so modifier 50 does not increase payment.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where 77066 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

77066 rates by state

Office rate range in each state. Select a state to see its payment localities.

How the 77066 rate is calculated

Each of 77066’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 77066

The CMS indicators that decide how 77066 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

77066 compared with similar codes

How to choose

77065Diagnostic mammogramOne breast, CAD included

This code covers diagnostic imaging of both breasts; 77065 is for a unilateral diagnostic examination.

77067Screening mammogramBilateral, CAD included

Use 77067 for bilateral screening mammography in an asymptomatic screening encounter. This code is for diagnostic evaluation, such as workup of a symptom or abnormal finding.

77062Breast tomosynthesisDiagnostic, bilateral

77062 reports bilateral diagnostic breast tomosynthesis. This code reports bilateral diagnostic mammography; both may be reported when both services are performed.

77049Breast MRIBilateral, without and with contrast

77049 is bilateral breast MRI with and without contrast, a different modality from diagnostic mammography.

Codes related to 77066

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates