CPT® Code 93458

Quick Reference

• Code definition: Reports the combined service of selective coronary angiography of native coronary arteries and left heart catheterization, including intraprocedural injections, imaging supervision and interpretation, and left ventriculography when performed.
• Key billing rule: Report only one code from the 93454 to 93461 family per catheterization session. Use 93458 only when coronary angiography and left heart catheterization are performed without right heart catheterization or bypass graft angiography.
• Modifier essentials: Append modifier 26 when billing in a hospital or ASC-owned cath lab (PC/TC indicator = 1). Modifier 59 applies when a prior diagnostic catheterization on the same date is genuinely distinct from a same-day interventional procedure, with supporting documentation.
• Documentation must-have: The catheterization report must identify each native vessel studied, percentage stenosis of all significant lesions, and left ventricular end-diastolic pressure (LVEDP) confirming that left heart catheterization was performed.
• Top confusion point: Reporting 93458 when bypass graft angiography was also performed is the most prevalent undercoding error in this family; 93459 is required whenever selective bypass graft imaging occurs in the same session.
• MUE = 1: Billing 93458 more than once on the same date of service per provider triggers automatic claim rejection.
• Payer alert: CMS NCCI generally bundles 93458 into same-day percutaneous coronary intervention (PCI) codes. Modifier 59 with documentation of a separate diagnostic encounter is required for any exception and carries significant audit scrutiny.

When to Use This Code

CPT 93458 captures the complete bundled service of selective coronary angiography of native coronary arteries combined with left heart catheterization. The code includes catheter placement in the coronary arteries, all intraprocedural injections for coronary angiography, imaging supervision and interpretation, retrograde advancement of the catheter across the aortic valve into the left ventricle, hemodynamic measurements (including LVEDP and pressure gradients across the aortic and mitral valves), and left ventriculography when performed. Imaging supervision and interpretation are bundled into the descriptor and cannot be separately reported.

Clinical indications for 93458 include:

• Stable or unstable angina with a positive or inconclusive noninvasive stress test
• NSTEMI when invasive evaluation is clinically appropriate, typically within 24 to 48 hours per ACC/AHA guidelines [5]
• Preoperative evaluation for valvular heart disease or high-risk noncardiac surgery
• Heart failure with undetermined etiology requiring assessment of coronary anatomy and left ventricular function
• Known or suspected coronary artery disease requiring anatomic confirmation before revascularization planning

Scope boundaries: 93458 covers native coronary vessels only. If bypass grafts are also selectively injected and imaged in the same session, the service upgrades to 93459. If a right heart catheterization is added, the correct code is 93460. Left ventriculography is optional within the descriptor ("when performed"); if LVG is not performed, no modifier is required and no downcode applies.

Setting: 93458 is exclusively a facility-based procedure. The ASC payment indicator confirms it is non-office-based (added to OPPS 2008 or later). The PC/TC indicator (1) confirms split billing: the performing cardiologist bills the professional component with modifier 26 while the hospital or ASC bills the facility component. Billing 93458 globally from a physician office NPI is incorrect.

Access route (femoral, radial, or brachial) does not affect code selection. If left heart catheterization is accomplished via transseptal puncture through an intact septum or by transapical puncture, report 93462 as an add-on in conjunction with 93458. [2]

Code Differentiation Table

The 93454 to 93461 family uses additive logic: start with the base service (coronary angiography of native vessels) and layer components (left heart cath, right heart cath, bypass graft angio) to select the appropriate code. Review the complete catheterization report before assigning any code in this range.

The single most consequential differentiator is whether bypass graft angiography was performed. Post-CABG patients presenting for recurrent angina frequently have both native vessels and grafts selectively imaged in the same session; using 93458 instead of 93459 in that scenario is undercoding and misrepresents the procedural scope documented in the report.

flowchart TD
    A[Coronary angiography\nperformed?] -->|Yes| B[Left heart\ncatheterization?]
    B -->|No| C[Right heart cath?]
    B -->|Yes| D[Bypass graft angio?]
    C -->|No| E[93454]
    C -->|Yes| F[Bypass graft angio?]
    F -->|No| G[93456]
    F -->|Yes| H[93457]
    D -->|No| I[Right heart cath?]
    D -->|Yes| J[Right heart cath?]
    I -->|No| K[93458]
    I -->|Yes| L[93460]
    J -->|No| M[93459]
    J -->|Yes| N[93461]

Billing & Modifier Rules

Modifier 26 (Professional Component): Required when the cardiologist bills in a hospital or ASC-owned cath lab. The PC/TC indicator (1) confirms that 93458 splits between a professional and a technical/facility component. Failure to append modifier 26 in a facility setting results in overpayment on the professional claim and potential recoupment.

Modifier 59 (Distinct Procedural Service): Applies when 93458 is billed on the same date as an interventional code and the diagnostic catheterization represents a truly separate and distinct service from the intervention. CMS NCCI generally bundles the diagnostic component into PCI codes when performed in the same session. [3] Modifier 59 may be appended only with documentation establishing that the diagnostic study was ordered and performed for a separate clinical question; this scenario is a known audit priority.

Modifier 22 (Increased Procedural Services): Appropriate for severely tortuous anatomy, anomalous coronary origins, or other technical challenges that substantially increase procedural work. Documentation must describe the specific complicating factors; the modifier without supporting report language will be rejected.

Modifier 52 (Reduced Services): Rarely applicable. Left ventriculography is optional ("when performed") within the descriptor; if LVG was not performed, no modifier is required. The code accurately describes the service as performed without LVG.

Add-on codes applicable with 93458:

Bundling alerts:

• 93565 (injection procedure for LV angiography) is explicitly prohibited in conjunction with 93458 per AMA CPT guidelines. [2] Do not report 93563, 93564, or 93565 alongside any code in the 93452 to 93461 range.
• 36200, 36215, 36216, 36217, and 36218 (catheter access and placement codes) are bundled components of 93458 and may not be separately reported.
• 76000 (fluoroscopy) is bundled into the imaging component and may not be separately reported.
• Prior to the 2011 restructure, imaging supervision was reported separately with 93555 and 93556. These codes are no longer separately reportable with any code in the 93454 to 93461 family. [2]
• MUE = 1: One unit per date of service per performing provider. [4]

Modifier 51 does not apply to 93458 (multiple procedures indicator = 0). Co-surgeons (modifier 62) and team surgery (modifier 66) are not permitted for this code.

Documentation Essentials

The catheterization report must support each component represented in the code. For 93458, minimum required documentation includes:

• Clinical indication: A specific diagnosis or clinical history establishing medical necessity. Generic language without supporting diagnostic workup is a denial risk under Medicare LCD criteria. [1]
• Access site and technique: Documented arterial access route (radial, femoral, or brachial), sheath size, and catheter types used.
• Vessels studied: Each native coronary artery and its major branches must be named and described using standard nomenclature (left main, LAD with diagonal branches, LCx with obtuse marginals, RCA with PDA). Percentage stenosis must be documented for any significant lesion.
• Left heart catheterization elements: Hemodynamic data including LVEDP, aortic pressure, and pressure gradients across the aortic and mitral valves when assessed. Absence of documented hemodynamic measurements undermines the left heart catheterization component.
• Left ventriculography (if performed): LV ejection fraction, regional wall motion by segment, and grade of mitral regurgitation if present. If LVG was not performed, the report should state so explicitly.
• Contrast agent: Type and total volume administered.
• Physician interpretation and signature: An unsigned or uninterpreted report does not support the professional component billing.

Audit red flags specific to 93458:

• Cath report documents bypass graft imaging but 93458 is reported instead of 93459; this pattern appears in OIG compliance reviews targeting upcoding within this code family. [6]
• 93458 billed on the same date as a PCI code without modifier 59 and without documentation of a separate diagnostic encounter.
• 93458 billed from a physician office NPI; this is not an office-based procedure.
• 93565 billed alongside 93458 in violation of AMA parenthetical guidelines.
• Repeat catheterization within a short interval without clinical documentation supporting medical necessity for a repeat study.

Medicare, Commercial & Medicaid Payer Rules

Medicare:

Cardiac catheterization is covered under Medicare National Coverage Determination (NCD) 20.15, which limits coverage to specific indications: known or suspected CAD, cardiomyopathy, valvular heart disease, congenital heart disease, and other conditions outlined in the determination. [1] Procedures without a documented covered indication will be denied. Multiple MACs have issued LCDs for cardiac catheterization; common covered indications include unstable angina, NSTEMI, stable angina with objective evidence of ischemia, preoperative evaluation for high-risk surgery, and heart failure evaluation.

The APC status indicator for 93458 designates payment through a comprehensive APC for hospital outpatient claims. ASC reimbursement is based on the OPPS relative payment weight. [4] The physician bills the professional component with modifier 26.

Moderate sedation has been separately reportable since January 1, 2017, when the moderate sedation flag was removed from cardiac catheterization codes. [2] When the performing cardiologist administers moderate sedation, report 99152 or 99153 as appropriate. When a separate provider administers sedation, use 99155 to 99157.

CMS NCCI generally bundles 93458 into same-day PCI codes. The exception requiring modifier 59 applies when the diagnostic catheterization was a genuinely separate service, such as a study performed at a distinct session or ordered for an independent clinical question by a different physician. This exception is subject to MAC-level scrutiny and post-payment audit review. [3]

Commercial payers:

Most commercial payers follow AMA CPT guidelines for the 93454 to 93461 family structure. However, commercial payers, including Medicare Advantage plans, may require prior authorization for elective cardiac catheterization. Verify authorization requirements before scheduling elective procedures. Medicare Advantage plans may apply frequency or medical necessity restrictions more stringent than traditional Medicare.

Some commercial payers apply automated edits bundling 93458 with same-day interventional codes without permitting a modifier 59 override. When separate billing is appropriate, submitting clinical documentation on initial claim submission is more effective than post-denial appeals.

Medicaid:

Medicaid coverage for cardiac catheterization varies by state. Many state programs use Medicare NCD 20.15 as a baseline coverage framework. Managed Medicaid plans may impose prior authorization requirements, frequency caps, or site-of-service restrictions beyond the fee-for-service program. Verify current state-specific and plan-specific requirements before submission.

Common Denials & Prevention

Wrong code from 93454 to 93461 family (undercoding): Coders who rely on the procedure summary or impression line rather than the full cath report will miss bypass graft angiography or right heart catheterization components performed in the same session. Denial language typically presents as "code inconsistent with documentation" or a request for records. Prevention: Read the body of the catheterization report. Confirm whether any bypass graft was selectively injected and whether a right heart catheterization with pulmonary artery pressure measurement was documented.

Same-day PCI bundling denial: NCCI pairs 93458 with coronary interventional codes when performed in the same session; the diagnostic component is considered inherent to the intervention. [3] Prevention: Do not separately report 93458 when PCI followed diagnostic cath in the same session without separate clinical justification. When the diagnostic study was genuinely distinct, submit 93458 with modifier 59 accompanied by the catheterization report and interventional report on initial submission. Retrospective appeals without strong documentation have low success rates.

Medical necessity denial (no covered diagnosis): Medicare and commercial payers deny 93458 when the claim does not include a diagnosis code meeting LCD or NCD criteria. [1] Prevention: Confirm that the primary diagnosis code reflects a covered indication. Unspecified angina (I20.9) or Z-codes used as the sole primary diagnosis when a confirmed condition is documented in the record are common triggers. Update the diagnosis to the most specific confirmed condition after the procedure report is finalized.

Missing modifier 26 in a facility setting: Billing 93458 globally from a hospital-employed cardiologist's NPI when the procedure was performed in a hospital cath lab creates an overpayment on the professional claim and a duplicate billing conflict with the facility claim. Prevention: Confirm place of service and the NPI used on the professional claim. Hospital and ASC-based cardiac catheterization requires modifier 26 on the physician claim.

Separately reporting bundled injection or imaging codes: Billing 93565 (LV injection procedure) or 76000 (fluoroscopy) alongside 93458 violates explicit AMA parenthetical prohibitions and generates NCCI bundling denials. [2] Prevention: Remove 93563, 93564, 93565, and 76000 from any charge capture template or charge master pairing that automatically appends them to 93458. These components have been bundled since the 2011 code restructure.

Coding Scenarios

Scenario 1: Standard elective diagnostic catheterization, no prior CABG

A 67-year-old male with stable angina and a positive nuclear stress test is brought to the hospital outpatient cath lab. Radial access is obtained. Selective coronary angiography demonstrates 70% stenosis in the mid-LAD and 40% stenosis in the RCA. Left heart catheterization is performed; LVEDP is 18 mmHg. Left ventriculography shows 55% EF with no wall motion abnormalities. No bypass grafts imaged. No right heart catheterization.

Correct coding: 93458 with modifier 26 / Diagnosis: I20.8 on presentation; I25.10 once CAD is confirmed on angiography

Why: Native coronary angiography plus left heart catheterization without RHC or bypass graft imaging maps directly to 93458. Left ventriculography is bundled. Modifier 26 is required because the hospital owns the cath lab.

Scenario 2: Post-CABG patient with recurrent angina

A 72-year-old female with prior CABG (LIMA to LAD, SVG to RCA) presents with recurrent exertional chest pain. The catheterization report documents selective angiography of native left main, LAD, LCx, and RCA, plus selective injection of the LIMA graft and the SVG. Left heart catheterization with left ventriculography (EF 40%) is performed.

Correct coding: 93459 with modifier 26 (not 93458) / Diagnosis: I25.10 or I25.700

Why: Selective bypass graft angiography in the same session requires 93459. Reporting 93458 here omits a documented procedural component and constitutes undercoding.

Scenario 3: Diagnostic catheterization with FFR measurement

A 65-year-old male undergoes coronary angiography revealing intermediate stenosis (55%) in the LCx. The interventional cardiologist places an FFR pressure wire; adenosine is administered; FFR measures 0.76, confirming hemodynamic significance. No RHC. No bypass grafts. Left heart catheterization with LVEDP measurement and left ventriculography performed.

Correct coding: 93458 with modifier 26 + 93571 / Diagnosis: I25.10

Why: 93571 is the add-on for intravascular physiologic measurement (FFR or CFR) and is reportable in addition to the primary catheterization code. Documentation must specify the measurement methodology, pharmacologic agent used, and the FFR value obtained.

Scenario 4: Diagnostic cath immediately followed by PCI in the same session

A 58-year-old male admitted for NSTEMI undergoes coronary angiography showing 95% stenosis in the proximal LAD. PCI with drug-eluting stent placement is performed immediately afterward in the same session. Left heart catheterization with LVEDP was documented before the intervention.

Correct coding: 92928 only; do not separately report 93458.

Why: CMS NCCI bundles the diagnostic catheterization into the interventional code when both occur in the same session. [3] Appending modifier 59 without documentation of a genuinely separate diagnostic encounter results in denial or post-payment recoupment.

Related Codes

• 93454 — Coronary angiography only; use when left heart catheterization is not performed
• 93459 — Adds bypass graft angiography to the 93458 components; required in post-CABG patients when grafts are imaged
• 93460 — Adds right heart catheterization to the 93458 components
• 93461 — Most comprehensive; all four components including RHC, LHC, native angio, and bypass graft angio
• 93462 — Add-on for transseptal or transapical LHC access approach; report with 93458 when antegrade approach is used
• 93463 — Add-on for pharmacologic hemodynamic challenge during catheterization
• 93571 — Add-on for FFR or coronary flow reserve measurement, initial vessel
• G0278 — Medicare add-on for iliac/femoral artery angiography performed at the time of cardiac catheterization

Sources

1. CMS Medicare National Coverage Determination 20.15 — Cardiac Catheterization. Coverage criteria for cardiac catheterization services under Medicare. Verify current version at the CMS Medicare Coverage Database.
2. AMA CPT Professional Edition — Code descriptors, parenthetical guidelines, and instructional notes for the cardiac catheterization family 93454 to 93464, including the 2011 restructure and 2017 moderate sedation removal. Verify current year edition at ama-assn.org.
3. CMS National Correct Coding Initiative (NCCI) Policy Manual for Medicare Services, Chapter 5 (Medicine) — Bundling rules and NCCI edit pairs for cardiovascular procedure codes. Current year edition required; verify at CMS.gov.
4. CMS Physician Fee Schedule 2026 Final Rule — RVU values, PC/TC indicators, MUE limits, APC and ASC status indicators for CPT 93458. Verify in the Federal Register CY 2026 MPFS Final Rule.
5. ACC/AHA 2021 Guideline for Coronary Artery Revascularization — Clinical indications for diagnostic coronary angiography and catheterization-based revascularization decision-making.
6. HHS OIG Work Plan — Active Items. Current OIG compliance priorities including cardiovascular procedure audits and same-day billing of diagnostic and interventional codes. See oig.hhs.gov for active work plan items.