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    v1.0.28
    OpenPayerBilling CodesCoronary and Vascular ProceduresCPT cpt-0523t-intraprocedural-coronary-blood-flow-mapping-interpretation
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    CPT 0523T: Coronary Blood Flow 3D Color Mapping During Cardiac Catheterization

    CPT code 0523T describes real-time review and interpretation during a cardiac catheterization of an imaging procedure that maps blood flow in the coronary arteries using 3D color mapping to determine whether intervention is needed for coronary stenosis; service type: intra-procedural imaging interpretation; typical site of service: cardiac catheterization laboratory (inpatient or outpatient interventional cardiology setting).

    For related coverage guidance, see recent payer policy updates: Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA), Cardiovascular Disease Risk Assessment, Biomarkers for Myocardial Infarction and Chronic Heart Failure.

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    Clinical & Coding Specifications

    Clinical Context

    A 68-year-old male with progressive exertional angina and known multi-vessel coronary artery disease is taken to the cardiac catheterization lab for diagnostic coronary angiography. During invasive coronary angiography, the interventional cardiologist performs a real-time intracoronary blood flow mapping study using 3D color flow mapping to assess the physiologic significance of a visually intermediate stenosis in the left anterior descending artery. The provider reviews and interprets the imaging results during the ongoing cardiac catheterization procedure to determine whether percutaneous coronary intervention (PCI) with stent placement is indicated. The clinical workflow includes arterial access (typically radial or femoral), catheter engagement of the coronary ostia, contrast angiography, acquisition of the 3D color flow mapping data, immediate interpretation of flow maps to assess for flow-limiting stenosis, and decision-making for immediate intervention versus conservative management. Typical site of service is an inpatient or outpatient cardiac catheterization laboratory within a hospital or ambulatory surgical center. Typical providers include interventional cardiologists and cardiothoracic procedural teams. Procedural documentation should include indication, imaging acquisition, real-time interpretation, hemodynamic data, decision made (no intervention, PCI, or referral for CABG), and any immediate complications.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    93458Catheter placement in coronary artery(s), coronary angiography including injection(s) for coronary angiography, with left heart catheterization when performed; with invasive coronary hemodynamic measurements and intraprocedural assessment of coronary physiology (eg, fractional flow reserve) when performedOften performed immediately before or with the 3D color flow mapping to define anatomy and hemodynamics; the mapping informs need for PCI
    92928Percutaneous transluminal coronary angioplasty; with stent placement, single major coronary artery or branchPerformed after interpretation if mapping shows flow-limiting stenosis requiring immediate PCI and stent deployment
    93459Catheter placement in coronary artery(s), coronary angiography including injection(s) for coronary angiography, with left heart catheterization when performed; with coronary angiography, including intraprocedural imaging for guidance (eg, IVUS, OCT)Alternative or complementary intraprocedural imaging codes that may be used when optical coherence tomography or intravascular ultrasound are performed in the same session
    93463Injection procedure during cardiac catheterization for contrast-enhanced imaging (cardiac CT or MRI correlation)May be used when adjunctive contrast-enhanced imaging or correlation is performed during the catheterization episode
    93571Right heart catheterization including measurement(s) of oxygen saturation and cardiac output when performedMay be performed in the same session when hemodynamic assessment of cardiac function is required to guide management decisions

    Related Modifiers

    7 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    82Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    207RC0000XCardiovascular Disease PhysicianAn internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
    207RP1001XPulmonary Disease PhysicianAn internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational an…
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    364S00000XClinical Nurse SpecialistA registered nurse who, through a graduate degree program in nursing, or through a formal post-basic education program or continuing education courses…
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    332B00000XDurable Medical Equipment & Medical SuppliesA supplier of medical equipment such as respirators, wheelchairs, home dialysis systems, or monitoring systems, that are prescribed by a physician for…
    2255A2300XAthletic TrainerAthletic trainers are allied health care professionals who work in consultation with or under the direction of physicians, and specialize in the preve…
    247ZC0005XClinical Laboratory Director (Non-physician)An individual who is state-licensed as a clinical laboratory director and meets the qualifications in the Clinical Laboratory Improvement Amendments o…

    Related ICD-10-CM Codes

    25 rows

    ICD-10-CM CodeDescription
    E11.9Type 2 diabetes mellitus without complications
    E78.5Hyperlipidemia, unspecified
    I20.0Unstable angina
    I20.1Angina pectoris with documented spasm
    I20.9Angina pectoris, unspecified
    I21.09ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
    I21.3ST elevation (STEMI) myocardial infarction of unspecified site
    I21.4Non-ST elevation (NSTEMI) myocardial infarction
    I21.9Acute myocardial infarction, unspecified
    I25.10Atherosclerotic heart disease of native coronary artery without angina pectoris

    Showing 1–10 of 25

    Related Payer Policy Updates

    Specialty: Cardiology1 / 3

    10 rows

    PolicyPayerEffective Date
    Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA)univerahealthcare2026-10-15
    Cardiovascular Disease Risk AssessmentOscar Health2026-10-01
    Biomarkers for Myocardial Infarction and Chronic Heart FailureOscar Health2026-10-01
    Multiple Procedure Payment Reduction for Diagnostic Cardiovascular ProceduresBlue Cross Blue Shield - Maine2026-10-01
    Cardiovascular Disease Risk Assessmentblue cross blue shield - louisiana2026-09-15
    Cardiovascular Disease Risk AssessmentBlue Cross Blue Shield - New Mexico2026-09-04
    Computed Tomography to Detect Coronary Artery CalcificationBluecross Idaho2026-09-01
    Intracoronary Drug Delivery Balloon ProceduresBlue Cross Blue Shield - Rhode Island2026-09-01
    Cardiac Imaging Guidelinesevicore2026-09-01
    Percutaneous Left Atrial Appendage Closure Device for Stroke PreventionAmbetter Georgia2026-08-26

    Related Codes

    CPT-0505T-FEMORAL-POPLITEAL-ENDOVASCULAR-STENT-TRANSVENOUS-ACCESS

    CPT 0505T: Femoral–Popliteal Arterial Stent via Venous Access

    CPT-0620T-ENDOVASCULAR-VENOUS-ARTERIALIZATION-TIBIAL-PERONEAL-STENT-PLACEMENT

    CPT 0620T: Endovascular Venous Arterialization of Tibial/Peroneal Vein

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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