Summary & Overview
CPT 33536: Coronary Artery Bypass with Four or More Arterial Grafts
CPT code 33536 denotes coronary artery bypass grafting (CABG) involving four or more arterial grafts. This complex cardiac surgery is a critical intervention for patients with multi-vessel coronary artery disease and significant ischemic symptoms. Nationally, high-acuity CABG procedures like those described by CPT code 33536 carry substantial implications for hospital resource use, perioperative management, and postoperative outcomes, and they remain a focal point for payer coverage policies and quality measurement.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical intent and service setting, plus context on where this procedure fits within surgical cardiology care pathways. The publication summarizes benchmark considerations for utilization and reimbursement patterns, highlights relevant policy updates affecting coverage and prior authorization practices, and outlines clinical context such as typical indications and expected postoperative care needs. Where input data is unavailable, the report notes ‘‘Data not available in the input.’’
This executive summary equips clinicians, hospital administrators, and policy analysts with a clear, national-level understanding of CPT code 33536 — its clinical purpose, typical delivery setting, and the payer landscape relevant to institutional planning and quality monitoring.
Billing Code Overview
CPT code 33536 describes a surgical coronary artery bypass graft (CABG) procedure with four or more arterial grafts. The provider diverts blood flow from damaged coronary vessels by grafting four or more arterial segments from another location (for example, from the chest or abdomen) to restore myocardial circulation, improve cardiac function, and reduce symptoms such as angina.
Service Type: Coronary artery bypass grafting (multi-arterial, four or more grafts)
Typical Site of Service: Inpatient hospital operating room with postoperative inpatient recovery, including cardiac surgery suites and intensive care unit recovery as clinically indicated.
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with progressive exertional angina and multivessel coronary artery disease undergoes elective coronary artery bypass grafting with four-vessel arterial grafts (33536). The patient has a history of hypertension and hyperlipidemia, failed maximal medical therapy, and coronary angiography demonstrating severe stenoses of the left anterior descending, left circumflex, and two diagonal/obtuse marginal branches. The clinical workflow includes preoperative evaluation (cardiology consult, noninvasive testing as indicated), coronary angiography with surgical planning, informed consent, general endotracheal anesthesia, median sternotomy, harvesting of arterial conduits (eg, internal mammary arteries, radial artery), cardiopulmonary bypass as needed, sequential or individual graft anastomoses to restore perfusion to four or more coronary arterial targets, intraoperative hemostasis and sternal closure, postoperative transfer to cardiac intensive care for hemodynamic monitoring, pain control, and early ambulation, with discharge planning for cardiac rehabilitation and outpatient follow-up.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (standard) | Used when no specific modifier applies to the service. |