CPT code 33777 represents surgical repair of dextro-transposition of the great arteries using an atrial baffle or tunnel (Mustard/Senning-type procedure) with cardiopulmonary bypass and correction of subpulmonic or pulmonary artery obstruction. This complex congenital cardiac operation remains a critical, life-saving intervention for neonates and children with anatomical ventricular-arterial discordance and has ongoing relevance for surgical centers, payers, and policy makers focused on congenital heart disease care.

Key national payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a clinical and billing context for CPT code 33777, including the procedure’s scope, typical site of service, and common modifiers used in claims processing. The publication outlines benchmark considerations and policy-related implications for reimbursement and utilization in a national context. It also highlights areas where further coding specificity, coverage policy clarity, and claims review protocols can affect payment and care coordination for high-acuity congenital cardiac surgery.