Summary & Overview
CPT 33513: Coronary Artery Bypass Grafting with Four Vein Grafts
CPT code 33513 covers surgical coronary artery bypass grafting (CABG) that uses four vein segments to bypass diseased coronary vessels. This code represents a major cardiac revascularization procedure performed to restore blood flow, improve heart function, and relieve ischemic symptoms such as angina. Nationally, CABG codes like 33513 drive significant inpatient surgical utilization and hospital resource allocation due to operative complexity, intensive perioperative care, and post-surgical recovery needs. Key payers considered in typical analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context for the procedure, typical sites of service, and payer coverage landscape. The publication reviews common billing considerations and reporting practices for this class of CABG procedures, summarizes expected service lines and care settings, and outlines where to find further policy updates and reimbursement guidance. Data not available in the input is noted where applicable. This summary is intended for national audiences including billing professionals, hospital administrators, and clinicians involved in cardiac surgery coding and reimbursement.
Billing Code Overview
CPT code 33513 describes coronary artery bypass grafting using four vein segments harvested from another site (commonly the leg) to bypass damaged coronary vessels. The procedure diverts blood flow around blocked or narrowed coronary arteries to restore myocardial circulation, improve cardiac function, and reduce symptoms such as angina.
Service type: Cardiac surgical revascularization (coronary artery bypass grafting with four vein grafts)
Typical site of service: Inpatient hospital operating room, often under general anesthesia with post-operative inpatient recovery.
Clinical & Coding Specifications
Clinical Context
A typical patient for 33513 is a 65-year-old male with multivessel coronary artery disease presenting with progressive exertional angina and objective ischemia on stress testing despite optimal medical therapy. Evaluation includes coronary angiography demonstrating significant stenoses of the left anterior descending, right coronary, and obtuse marginal branches, making him a candidate for surgical revascularization. The clinical workflow begins with preoperative assessment (history, physical, labs, ECG, echocardiogram), anesthesia evaluation, and informed consent. In the operating room, the cardiothoracic surgical team harvests four autologous saphenous vein grafts (commonly from the leg), places the patient on cardiopulmonary bypass as indicated, performs distal and proximal anastomoses to bypass occluded coronary arteries, and achieves hemostasis. Postoperative care includes monitoring in a cardiac intensive care unit, ventilatory weaning, pain control, anticoagulation management, wound care for vein harvest sites, and cardiac rehabilitation referral. Typical sites of service for 33513 are the hospital operating room and inpatient cardiac surgery unit. Payers commonly involved in authorization and coverage include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.
Coding Specifications
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