CPT code 33660 represents open cardiac surgical repair to close a defect in the wall between the atria and ventricles, often using sutures or a patch of Dacron® or pericardium, with concurrent repair of the tricuspid and mitral valves as indicated. This procedure is critical in treating structural heart defects that disrupt intracardiac blood flow and valve function, with significant implications for surgical outcomes and postoperative care across hospital systems nationwide.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a national perspective on clinical context and billing considerations relevant to facilities and clinicians performing complex intracardiac repairs.

Readers will find a concise clinical description of the procedure, typical site-of-service expectations, and an overview of common modifiers and payer coverage patterns where available. The report outlines benchmarks for coding practice, potential policy updates affecting coverage, and the clinical circumstances under which valve repair is performed alongside septal closure. Data not available in the input is noted where applicable, and the piece focuses on giving clinicians, billing professionals, and policy analysts a clear, operational summary of CPT code 33660.