CPT code 93566: Chamber angiography, right atrium or ventricle2026 Medicare rate & RVUs in Maine
Reports selective angiography of the right atrium or right ventricle performed during cardiac catheterization, with imaging supervision, interpretation, and reporting.
Medicare pays $23.87–$24.34 for 93566 in the office in Maine, from Rest of Maine to Southern Maine, ME. 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 93566 covers
This add-on describes selective contrast imaging of the right atrium or right ventricle during cardiac catheterization. A cardiologist or other physician performing the catheterization may use it to evaluate right-sided chamber anatomy, such as when assessing a congenital or structural abnormality. The code covers the injection and its imaging supervision, interpretation, and report; routine catheter placement and pressure measurements alone do not describe this angiographic service.
Report 93566 only with an eligible primary cardiac catheterization procedure, not as a standalone service. The record should identify the selectively imaged chamber and support that a contrast injection and angiographic study were performed, with the findings documented. CMS treats this add-on as paid within the primary procedure's global period. The imaging supervision, interpretation, and report are part of this injection service.
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 93566 pays more and less in Maine
| Payment locality | Office | Facility |
|---|---|---|
| Rest of Maine | $23.87 | $21.10 |
| Southern Maine, ME | $24.34 | $21.36 |
How the 93566 rate is calculated
Each of 93566’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 · 93566
RVUs × geographic indexes × conversion factor
Work0.49
0.49 RVUs× 1.000 GPCI
Practice expense0.19
0.19 RVUs× 1.000 GPCI
Malpractice0.08
0.08 RVUs× 1.000 GPCI
Adjusted RVUs
0.7600
Conversion factor
$33.4009
Medicare rate
$25.38
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 93566
The CMS indicators that decide how 93566 is paid alongside other services.
CMS payment indicators · 93566
Chamber angiography, right atrium or ventricle
| Rule | CMS value | What it means |
|---|---|---|
| Global period | ZZZ | Add-on code: falls within the primary procedure’s global period. |
| 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 | 0 | Physician service: no professional/technical split. |
93566 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 93565Cardiac angiographyLeft ventricle or atrium
- Choose 93566 for selective right atrial or right ventricular imaging; 93565 describes left atrial or left ventricular angiography.
- 93567Aortic angiographySupravalvular injection
- 93567 is for imaging the supravalvular aorta, not a right-sided heart chamber.
- 93568Pulmonary angiographyNonselective injection
- 93568 describes nonselective pulmonary artery angiography; 93566 is for selective imaging of the right atrium or ventricle.
93566 billing questions
Can 93566 be reported by itself?
No. It is an add-on code and must be reported with an eligible primary cardiac catheterization procedure.
How is 93566 different from 93565?
93566 reports selective imaging of the right atrium or right ventricle. 93565 is for left ventricular or left atrial angiography.
Does a right heart catheterization with pressure measurements support 93566?
Pressure measurements alone do not describe selective right-sided chamber angiography. The record should support a contrast injection and angiographic imaging of the right atrium or ventricle.
Is the angiographic interpretation separately reported?
The code includes imaging supervision, interpretation, and reporting for the injection study.
What should the procedure note identify?
Document which right-sided chamber was selectively imaged, the injection and angiographic study, and the resulting findings.
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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