CPT code 33641 designates open surgical closure of an atrial septal defect (ASD) via atriotomy with patch repair under direct visualization. This operative code captures a definitive, invasive cardiac procedure used to correct intracardiac shunts that can lead to right-sided volume overload, arrhythmia, or heart failure if untreated. Nationally, accurate coding of such major cardiac surgeries matters for clinical registry tracking, hospital quality reporting, and payer adjudication of high-acuity services.

Key payers in the scope of typical coverage and reimbursement analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context about the procedure, typical sites of service, and the types of claims considerations linked to complex cardiac operations. The publication outlines benchmarks and payment-related themes relevant to inpatient surgical cardiovascular care, summarizes common modifiers supplied in the input, and highlights areas where billing clarity affects hospital revenue cycle and clinical documentation.

The report is intended for coding professionals, hospital finance leaders, and clinicians involved in perioperative documentation, providing concise guidance on the code's clinical meaning, payer relevance, and where to focus documentation for accurate claim submission. Data not available in the input is noted where applicable.