CPT code 75577: Coronary plaque analysis, CTA-based quantification2026 Medicare rate & RVUs in Illinois
Reports quantitative assessment of coronary atherosclerotic plaque from coronary CT angiography data, including image processing, interpretation, and a separate report.
Medicare pays $927.55–$1,040.05 for 75577 in the office in Illinois, from Rest of Illinois to Suburban Chicago, IL. 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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What 75577 covers
This service analyzes coronary CT angiography images to quantify atherosclerotic plaque burden and assess plaque characteristics in the coronary arteries. Image-processing software and trained staff support the analysis; a qualified physician interprets the results and documents the findings. It is used in cardiac imaging settings when a clinician seeks a detailed plaque assessment from coronary CTA data, rather than only a visual review of the angiogram or a coronary calcium score.
Report 75577 when the quantitative plaque analysis is performed and its findings are documented in a report. The record should support that coronary CTA data were analyzed and identify the resulting plaque findings. CMS recognizes professional and technical components: modifier 26 identifies the interpretation, while modifier TC identifies the equipment and staff portion. Report the global service without either modifier when one billing entity provides both components.
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 75577 pays more and less in Illinois
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
4 payment localities
$927.55 to $1040.05
| Payment locality | Office | Facility |
|---|---|---|
| Chicago, IL | $1,019.32 | Unavailable |
| East St. Louis, IL | $935.18 | Unavailable |
| Rest of Illinois | $927.55 | Unavailable |
| Suburban Chicago, IL | $1,040.05 | Unavailable |
How the 75577 rate is calculated
Each of 75577’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 · 75577
RVUs × geographic indexes × conversion factor
Work0.85
0.85 RVUs× 1.000 GPCI
Practice expense29.40
29.40 RVUs× 1.000 GPCI
Malpractice0.05
0.05 RVUs× 1.000 GPCI
Adjusted RVUs
30.3000
Conversion factor
$33.4009
Medicare rate
$1,012.05
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 75577
The CMS indicators that decide how 75577 is paid alongside other services.
CMS payment indicators · 75577
Coronary plaque analysis, CTA-based quantification
| 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) | 0 | The 150% bilateral adjustment doesn’t apply. |
| 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
75577 without 26 · national office
$1,012.05
Coronary plaque analysis, CTA-based quantification
75577-26 · Professional component
$41.42
Pays only the interpretation and report.
75577 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 75574Coronary CTAWith contrast and 3D reconstruction
- 75574 reports coronary CT angiography. Use 75577 for quantitative plaque analysis based on coronary CTA data, when that analysis is performed and documented.
- 75571Calcium scoringQuantitative coronary calcium
- 75571 is a coronary calcium assessment using noncontrast CT; 75577 evaluates plaque using coronary CTA data.
- 75580CT-derived FFRCoronary CTA dataset
- 75580 analyzes coronary CTA data for a noninvasive physiologic estimate of lesion significance. Code 75577 quantifies coronary plaque.
75577 billing questions
How is 75577 different from coronary CTA code 75574?
75574 represents coronary CT angiography; 75577 is the quantitative plaque analysis performed on coronary CTA data. The documentation should support each service reported.
Is 75577 a calcium score?
No. Code 75577 quantifies plaque using coronary CTA data, while 75571 reports a coronary calcium assessment from a noncontrast cardiac CT.
Can the professional and technical portions be billed separately?
Yes. Use modifier 26 for the professional interpretation and report, or modifier TC for the technical portion. Bill without either modifier for the global service.
What documentation supports 75577?
Document the coronary CTA data analyzed, the quantitative plaque findings, and the interpreting physician’s report. The record should show that a plaque analysis was performed, not only a standard CTA interpretation.
Does 75577 replace 75574?
No. The codes represent different services: coronary CTA and quantitative analysis of plaque using CTA data. Report both only when both services were performed and are supported by the record.
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
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