CPT code 77066: Diagnostic mammogram, bilateral, including CAD2026 Medicare rate & RVUs in Texas
Reports diagnostic mammographic imaging of both breasts, including computer-aided detection when performed, for symptoms or evaluation of a breast finding.
Medicare pays $145.85–$163.80 for 77066 in the office in Texas, from Beaumont, TX to Austin, TX. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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On this page 9 sections
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 in Texas
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
8 payment localities
$145.85 to $163.80
8 of 8 payment localities
| Payment locality | Office | Facility |
|---|---|---|
| Austin, TX | $163.80 | Unavailable |
| Beaumont, TX | $145.85 | Unavailable |
| Brazoria, TX | $155.56 | Unavailable |
| Dallas, TX | $156.41 | Unavailable |
| Fort Worth, TX | $155.23 | Unavailable |
| Galveston, TX | $155.94 | Unavailable |
| Houston, TX | $157.40 | Unavailable |
| Rest of Texas | $150.52 | Unavailable |
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.
How the rate is built · 77066
RVUs × geographic indexes × conversion factor
Work0.98
0.98 RVUs× 1.000 GPCI
Practice expense3.64
3.64 RVUs× 1.000 GPCI
Malpractice0.08
0.08 RVUs× 1.000 GPCI
Adjusted RVUs
4.7000
Conversion factor
$33.4009
Medicare rate
$156.98
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 77066
The CMS indicators that decide how 77066 is paid alongside other services.
CMS payment indicators · 77066
Diagnostic mammogram, bilateral, including CAD
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 2 | Already bilateral by definition: paid once at 100%. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 1 | Diagnostic test with separate professional (26) and technical (TC) components. |
What modifiers do to the payment
Modifier 26 · payment effect
With and without the modifier
77066 without 26 · national office
$156.98
Diagnostic mammogram, bilateral, including CAD
77066-26 · Professional component
$46.43
Pays only the interpretation and report.
77066 compared with similar codes
Compare codes · National
5 codes, side by side
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.
77066 billing questions
When should I report this instead of the unilateral diagnostic mammogram?
Report this code when the diagnostic mammographic examination covers both breasts. Use the unilateral code when the examination covers one breast.
Is computer-aided detection billed separately?
No. CAD is included in this diagnostic mammography code when performed.
Should modifier 50 be appended?
No. The code is already priced as bilateral, and modifier 50 does not increase payment.
When are modifiers 26 and TC appropriate?
Use modifier 26 for the professional interpretation and modifier TC for the technical service, including equipment and staff. Without either modifier, the claim represents the global service.
Can bilateral diagnostic tomosynthesis be reported with this code?
When bilateral diagnostic breast tomosynthesis is also performed, code 77062 may be reported for that service alongside the diagnostic mammography.
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
Show the CMS file lines behind this rate
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