CPT code 33519 denotes a coronary artery bypass grafting procedure involving three venous grafts performed as part of a combined venous and arterial revascularization. This code captures a complex open-heart surgical intervention aimed at restoring coronary circulation, improving cardiac function, and reducing symptoms such as angina. Nationally, CABG procedures remain a critical component of surgical management for multivessel coronary artery disease and carry significant implications for hospital resource use, episode cost, and quality measurement.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for 33519, typical sites of service, common modifiers and how they relate to billing complexity, and the payer mix typically relevant for cardiac surgical episodes. The publication also outlines benchmarks commonly used to assess utilization and payment for CABG procedures, highlights policy or coding clarifications when applicable, and provides guidance on documentation themes that support accurate coding. Data not available in the input is noted where applicable. The content is intended to inform coding, billing, and policy stakeholders nationally about the clinical and administrative profile of CPT code 33519 without offering clinical recommendations.