CPT code 33771 represents a major congenital cardiac surgery to correct transposition of the great arteries with an associated ventricular septal defect and pulmonary artery narrowing. The operation involves reestablishing the correct arterial connections to the ventricles, enlarging the septal defect and placing a graft to route the left ventricle to the aorta, and relieving pulmonary artery stenosis. This procedure is clinically significant because it addresses life‑threatening structural heart defects present from birth and requires specialized surgical teams and intensive postoperative care.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a concise overview of the clinical context for CPT code 33771, typical sites of service, common modifier usage (listed separately), and the types of benchmarks and policy considerations payers apply to high‑complexity congenital cardiac procedures. The publication outlines where to look for reimbursement policy updates, customary inpatient surgical coding practices, and payer coverage patterns for specialized pediatric and adult congenital cardiac surgery. It also highlights implications for hospital service lines, care coordination needs, and documentation elements that commonly factor into claims adjudication. Data not available in the input is noted where necessary.