CPT 93451 covers a right heart catheterization performed on its own, including the oxygen saturation and cardiac output measurements when performed. Almost every 93451 denial has the same cause: it was reported next to a code that already contains a right heart catheterization.
What CPT 93451 covers
93451 is right heart catheterization including measurement(s) of oxygen saturation and cardiac output, when performed. It covers the right-sided study: pressures through the right atrium, right ventricle and pulmonary artery, wedge pressure, saturations and cardiac output.
It is the correct code only when the right heart study stands alone. The moment coronary angiography or a left heart catheterization is added in the same session, a combined code replaces it.
Where 93451 sits in the cath family
93451 is right heart catheterization with nothing else. Once coronary angiography is added, the code changes: 93456 with coronary angiography, 93457 with bypass grafts as well, and 93460 or 93461 if the left heart was also catheterized. Right and left heart catheterization without coronaries is 93453. Pick the one code that describes the whole session. See the complete 93451 to 93461 code map on the CPT 93458 guide.
Reimbursement context
93451 splits into professional and technical components, and the setting decides which you may report.
2026 Medicare RVUs for CPT 93451
| CPT 93451: 2026 Medicare RVUs (national, before GPCI) | ||||||
|---|---|---|---|---|---|---|
| Line | Work | PE, non-facility | PE, facility | Malpractice | Total, non-facility | Total, facility |
| Global (no modifier) | 2.41 | 22.66 | NA | 0.42 | 25.49 | NA |
| Professional (modifier 26) | 2.41 | 1.03 | 1.03 | 0.39 | 3.83 | 3.83 |
| Technical (modifier TC) | 0.00 | 21.63 | NA | 0.03 | 21.66 | NA |
Source: CMS CY 2026 PFS Relative Value File, RVU26D (October release, published 08/26/2026). RVUs are national and unadjusted; commercial payers set their own rates.
In the 2026 CMS relative value file, CPT 93451 carries 2.41 work RVUs and 25.49 total RVUs when billed globally in a non-facility setting. The global line is NA in a facility, because there the physician bills the professional component only and the facility bills the technical side. Its PC/TC indicator is 1: the code splits into a professional component (modifier 26, 3.83 total RVUs) and a technical component (modifier TC, 21.66 total RVUs), and the global line is billed only when one entity does both. Its global period is 000: related work on the day of the procedure is included, with no postoperative days. Across the diagnostic catheterization family, work RVUs run from 2.41 (93451) to 7.65 (93461), so 93451 carries the lowest physician work in its group.
To turn RVUs into payment, each component is multiplied by your locality's geographic practice cost index, the three are added, and the sum is multiplied by the 2026 conversion factor: $33.4009, or $33.5675 for qualifying APM participants (CMS-1832-F; CMS fact sheet). The CMS Physician Fee Schedule Look-Up Tool runs that calculation for your locality.
Documentation requirements
- The cardiac indication that justified the study, coded specifically.
- Access site, sheath and each catheter used.
- Every vessel or chamber selectively engaged, with findings.
- Hemodynamic measurements obtained, including pressures, gradients and saturations where applicable.
- Contrast volume and fluoroscopy time.
- A signed interpretation naming the study actually performed.
- Where an intervention followed in the same session, why the diagnostic study was necessary and not already available.
Medicare contractor billing articles. Each Medicare Administrative Contractor publishes its own billing and coding articles for this service, and the covered diagnoses differ by jurisdiction. Active examples in the CMS Medicare Coverage Database, checked September 28, 2026: A52850 (Cardiac Catheterization and Coronary Angiography, Wellpoint Federal) and A56500 (Cardiac Catheterization and Coronary Angiography, CGS). Use the article from the contractor that processes your claims.
Common denials and the exact fix
CO-97: 93451 billed with a code that already includes right heart catheterization
93453, 93456, 93457, 93460 and 93461 all contain a right heart catheterization in their descriptors. Reporting 93451 alongside any of them bills the same study twice.
Fix: delete the 93451 line and report the combined code alone.
93451 billed with 93458
A right heart catheterization performed in the same session as a left heart study with coronary angiography is not two codes.
Fix: report 93460. If bypass grafts were also imaged, report 93461.
93451 billed with 93454
Coronary angiography performed alongside a right heart catheterization has its own combined code.
Fix: report 93456, or 93457 where bypass grafts were also imaged.
CO-236: components billed separately
Vascular access, guidance and closure through the same access are inside the code.
Fix: remove those lines.
CO-50: indication does not support a right heart study
Right heart catheterization requires a documented hemodynamic question, such as suspected pulmonary hypertension, shunt evaluation or heart failure assessment.
Fix: code the specific indication and ensure the record states the question the study was meant to answer.
What is already inside these codes
- Vascular access and sheath placement through the same access.
- Fluoroscopic guidance and roadmapping.
- Closure devices.
- The intraprocedural injections for the angiography described by the code.
- Imaging supervision and interpretation.
Billing any of these separately on the professional claim produces a CO-236 unbundling denial. Hospitals may still report closure device placement with HCPCS G0269, but it is packaged into the procedure rather than paid separately.One add-on is separately reportable with 93451 when genuinely performed and documented: 93568 for pulmonary artery angiography. Supravalvular aortography, 93567, needs arterial access and is not reported with a right heart catheterization alone.
Modifier rules
- 26 / TC: 93451 splits by setting. In a hospital the physician bills modifier 26 and the facility reports the technical side; the global line is only for one entity furnishing both. A modifier that contradicts the place of service is the most common modifier denial on 93451.
- 59 / XE / XP / XS / XU: only for a genuinely distinct service in a separate session, site or encounter. Right heart catheterization is already inside 93453, 93456, 93457, 93460 and 93461, so no modifier rescues a 93451 line billed next to any of them for the same session.
- 51: multiple procedures; most payers apply it automatically.
- 22: increased procedural services on 93451 is rare, needs a narrative and goes to manual review.
- LC, LD, RC, RI, LM: vessel modifiers belong on intervention codes, not on 93451.
NCCI bundling edits
- 93451 with 93453, 93456, 93457, 93460 or 93461: all of those already include right heart catheterization.
- 93451 with 93458: resolves to 93460.
- 93451 with 93454: resolves to 93456.
- 93568: separately reportable where genuinely performed; pulmonary artery angiography alongside a right heart study is a common legitimate pairing. 93567: not reported with right heart catheterization alone.
Frequently asked questions
When is CPT 93451 the correct code?
Why did 93451 deny when billed with 93460?
Can pulmonary angiography be billed with 93451?
Sources
American Medical Association, CPT 2026 Professional Edition.
Centers for Medicare & Medicaid Services, CY 2026 PFS Relative Value File RVU26D (October release): RVUs, PC/TC indicator and global period for CPT 93451.
Centers for Medicare & Medicaid Services, CY 2026 Physician Fee Schedule final rule, CMS-1832-F: conversion factors.
Centers for Medicare & Medicaid Services, National Correct Coding Initiative Policy Manual for Medicare Services and quarterly procedure-to-procedure edit tables.
Medicare Coverage Database billing and coding articles A52850, A56500.
CPT® is a registered trademark of the American Medical Association. Payer policy and NCCI edits change quarterly, so check your own contractor before submission. How we verify this guidance.
Related codes
- CPT 93460. Right and left heart cath with coronary angiography.
- CPT 93461. Right and left heart cath with coronary and graft angiography.
- CPT 93452. Left heart cath with ventriculography, no angiography.
More cardiology code guides
- CPT 93306. Complete TTE with spectral and color flow Doppler.
- CPT 93307. Complete TTE without Doppler.
- CPT 93308. Limited or follow-up echo.
Related reading
- Cardiology billing & RCM. How we scrub cardiology claims across diagnostics, cath lab, EP and remote monitoring.
- Cardiac cath billing: NCCI bundling and modifier 59. Where cath lab bundling edits bite, and when a distinct-service modifier is genuinely earned.
- TC/26 modifier errors in cardiology. The split-billing mistakes that cost diagnostic practices the most.
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