CPT 33535 Three-Arterial CABG Reimbursement | OpenPayer

Summary & Overview

CPT 33535: Three-Arterial Coronary Artery Bypass Grafting

CPT code 33535 denotes a coronary artery bypass grafting procedure using three arterial grafts to bypass diseased coronary vessels and restore myocardial blood flow. This high-acuity cardiac surgical service is performed primarily in inpatient hospital operating suites and has significant clinical and financial implications due to its role in treating advanced coronary artery disease and relieving ischemic symptoms. Nationally, coronary artery bypass procedures remain a cornerstone of surgical treatment for multivessel coronary disease and are important for quality measurement and resource planning. Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 33535, typical sites of service, common modifiers listed in input, and the kinds of benchmarks and policy topics that affect coverage and billing for complex cardiac surgery. The publication also outlines clinical coding relationships and related service-line considerations relevant to hospitals and cardiothoracic surgical practices. Data not available in the input for associated taxonomies, specific ICD-10 diagnoses, and payer-specific reimbursement rates.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 33535coronary artery bypasscardiac surgerycardiothoracicinpatient surgeryarterial graftsurgical procedurehospital billing

Billing Code Overview

CPT code 33535 describes a surgical procedure that diverts blood flow from damaged coronary vessels by grafting three arterial segments from another location (such as the chest or abdomen) to restore coronary circulation, improve cardiac function, and reduce symptoms like angina.

Service type: Surgical coronary artery bypass grafting using three arterial grafts
Typical site of service: Inpatient hospital surgical suite or operating room with postoperative inpatient care

Data not available in the input for payers, associated taxonomies, and ICD-10 diagnoses.

Clinical & Coding Specifications

Clinical Context

A typical patient is a 65-year-old man with progressive exertional angina and documented multivessel coronary artery disease on coronary angiography, showing significant stenosis of the left anterior descending, right coronary, and circumflex coronary arteries. The patient has recurrent symptoms despite optimal medical therapy and has reduced exercise tolerance. The cardiovascular surgery team evaluates surgical candidacy and recommends coronary artery bypass grafting with three arterial grafts to improve myocardial perfusion and relieve ischemic symptoms.

Preoperative workflow includes cardiology consultation, noninvasive testing (stress imaging or perfusion), coronary angiography, perioperative risk assessment (including echocardiogram, labs, medication reconciliation), informed consent, and scheduling for sternotomy and graft harvest. Intraoperative care entails general anesthesia, median sternotomy, harvesting of arterial conduits (commonly internal mammary arteries and radial artery), cardiopulmonary bypass or off-pump technique as appropriate, construction of three coronary-artery bypass grafts, hemostasis, and chest closure. Postoperative workflow includes transfer to intensive care, hemodynamic monitoring, ventilator and pain management, early mobilization, discharge planning, and outpatient cardiac rehabilitation and follow-up with the cardiothoracic surgeon and cardiologist.

Coding Specifications

Modifier	Description	When to Use
`62`	Two surgeons

CPT 33545: Repair of Postinfarction Ventricular Septal Defect

33533-CORONARY-ARTERY-BYPASS-USING-ARTERIAL-GRAFTS-SINGLE

33533 – Coronary artery bypass, using arterial graft(s); single arterial graft

CPT-33542-VENTRICULAR-ANEURYSM-RESECTION-AND-REPAIR

CPT 33542: Ventricular Aneurysm Resection and Repair

CPT-33534-CORONARY-ARTERY-BYPASS-TWO-ARTERIAL-GRAFTS

CPT 33534: Coronary Artery Bypass with Two Arterial Grafts

CPT-33536-CORONARY-ARTERY-BYPASS-FOUR-OR-MORE-ARTERIAL-GRAFTS

CPT 33536: Coronary Artery Bypass with Four or More Arterial Grafts

CPT-33548-VENTRICULAR-RESTORATION-POST-MYOCARDIAL-INFARCTION

CPT 33548: Surgical Ventricular Restoration After Myocardial Infarction

Taxonomy Code	Specialty	Notes
207L00000X	Cardiothoracic Surgery	Primary specialty performing coronary artery bypass grafting.
207LD0101X	Thoracic Surgery	Surgeons trained in thoracic procedures including CABG.
207RC0000X	Interventional Cardiology	Preoperative evaluation and follow-up; not the operating surgeon for CABG.
207RG0300X	Cardiology	Cardiac surgeons coordinate with cardiologists for perioperative management.
207T00000X	Vascular Surgery	May be involved in conduit harvest or complex vascular access, occasionally participating in multidisciplinary cases.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Common underlying chronic coronary artery disease indication for CABG when ischemia is present.
`I25.110`	Atherosclerotic heart disease of native coronary artery with unstable angina	Indicates unstable ischemia often prompting urgent CABG.
`I25.9`	Chronic ischemic heart disease, unspecified	General diagnosis describing ischemic disease leading to revascularization.
`I20.0`	Unstable angina	Acute coronary syndrome presentation that may require urgent surgical revascularization.
`I21.9`	Acute myocardial infarction, unspecified	Recent MI may necessitate CABG as part of revascularization strategy in select patients.
`I50.9`	Heart failure, unspecified	Patients with ischemic cardiomyopathy and reduced ejection fraction may undergo CABG to improve perfusion and function.
`Z95.1`	Presence of aortocoronary bypass graft	Relevant for documentation of prior grafts when planning repeat procedures or graft assessment.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33533`	Coronary artery bypass, three coronary arterial grafts; using venous graft(s) and arterial graft(s)	Alternative code when graft composition differs; used when one or more grafts are venous.
`33536`	Coronary artery bypass, with four arterial grafts	Used when four arterial grafts are performed instead of three; represents higher-level CABG.
`00560`	Anesthesia for procedures on heart and pericardial sac; not otherwise specified	Represents anesthesia services for open cardiac surgery; billed by anesthesia providers with appropriate modifiers.
`33206`	Insertion of temporary transvenous pacemaker, with or without connection to external power source	May be performed perioperatively for arrhythmia management or conduction disturbances.
`99238`	Hospital discharge day management; 30 minutes or more	Used for the attending surgeon or cardiologist for discharge services following postoperative hospitalization.
`92950`	Cardiopulmonary resuscitation (CPR)	May be used if an intraoperative or postoperative arrest occurs requiring CPR.

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