CPT code 33545 represents open surgical repair of a postinfarction ventricular septal defect, often performed emergently after myocardial infarction when septal rupture or an obstructing intracardiac mass impairs cardiac output. This high-acuity cardiac surgical procedure is nationally important because it addresses life-threatening mechanical complications of myocardial infarction that require specialized operative and intensive care resources.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and the types of documentation and coding considerations commonly associated with complex cardiac surgery. The publication also summarizes relevant benchmarks and payment policy themes that affect coverage and reimbursement for high-acuity inpatient cardiac operations, highlights common modifier usage when available, and outlines where to find ICD-10 diagnosis linkage and related procedural codes.

This resource is intended for coding professionals, hospital billing managers, and policy analysts who need a national-level briefing on the clinical nature of CPT code 33545, how it fits into inpatient cardiac surgical services, and what payer coverage patterns and policy factors typically influence billing and reimbursement for postinfarction septal repair.