Summary & Overview
CPT 33522: Coronary Artery Bypass with Five Venous Grafts
CPT code 33522 represents a complex coronary artery bypass grafting (CABG) operation in which five venous graft segments are used in combination with arterial grafts to revascularize the heart. This code captures a high-intensity, operative cardiac service typically performed in an inpatient hospital operating room and is a key billing descriptor for advanced revascularization care. Nationally, CABG codes like 33522 are important for tracking surgical volume, resource utilization, and payment policies for major cardiac procedures.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical service represented by 33522, the typical site of service, and the service type. The publication also summarizes benchmarking and payment considerations across major payers, highlights clinical context for why five-vein graft CABG is billed differently than fewer-graft procedures, and notes relevant policy updates and coding guidance when available.
This overview is intended for clinical coders, billing professionals, and policy analysts seeking a clear, national-level summary of how CPT code 33522 is used to capture multi-graft CABG procedures and where it fits within cardiac surgical services.
Billing Code Overview
CPT code 33522 describes a coronary artery bypass grafting (CABG) procedure in which the surgeon grafts five venous conduit segments, typically harvested from another site such as the leg, to bypass obstructed coronary arteries while also performing arterial grafting. The intent of the procedure is to restore coronary blood flow, improve cardiac function, and reduce ischemic symptoms such as angina.
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Service type: Surgical revascularization (coronary artery bypass grafting with both venous and arterial grafts)
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Typical site of service: Hospital operating room, inpatient cardiac surgery setting
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with progressive exertional angina, prior positive stress test, and coronary angiography demonstrating multi-vessel coronary artery disease with critical stenoses of the left anterior descending, right coronary, and two obtuse marginal branches is scheduled for surgical revascularization. The cardiovascular surgeon performs a coronary artery bypass grafting procedure using both arterial and venous conduits, harvesting five vein segments (most commonly from the greater saphenous vein) and at least one arterial graft (such as the left internal mammary artery) to bypass the diseased coronary vessels. The procedure is performed in an inpatient operating room under general anesthesia with cardiopulmonary bypass support. Typical perioperative workflow includes preoperative cardiology and anesthesia evaluation, intraoperative grafting and cardiac stabilization, postoperative intensive care monitoring in a cardiothoracic ICU, and subsequent step-down inpatient recovery prior to discharge when stable.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Default — no modifier | Use when no other modifier applies and the claim is standard for the service provided |
11 | Primary procedure |