CPT code 33390 identifies open surgical repair of a malfunctioning aortic valve performed with cardiopulmonary bypass and cardiac arrest to treat aortic stenosis. This code captures a high-acuity cardiovascular procedure that has significant implications for hospital resource use, perioperative risk management, and reimbursement given its reliance on operating room time, cardiopulmonary bypass, and intensive postoperative care. Nationally, accurate coding of this procedure affects quality measurement, case-mix adjustment, and payment for complex cardiac surgery.

Key payers evaluated in this publication include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a clinical and coding overview of the surgical service, typical site-of-service expectations, and common modifiers associated with complex intraoperative and postoperative circumstances. The analysis highlights benchmarks for coding practice and utilization patterns where available, practical considerations for claims documentation, and recent policy or payer guidance that may affect coverage and prior authorization processes.

This summary equips billing managers, clinical coders, and policy analysts with the context needed to interpret claims involving 33390, understand payer coverage environments, and align documentation with coding standards for open aortic valve repair using cardiopulmonary bypass.