Summary & Overview
CPT 33777: Atrial Baffle Repair for Transposition of the Great Arteries
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.
Billing Code Overview
CPT code 33777 describes surgical repair of a congenital transposition of the great arteries using an atrial-level baffle or tunnel (Mustard or Senning type procedure). The operation constructs an intracardiac baffle from pericardium or atrial tissue to redirect systemic and pulmonary venous return, places the patient on cardiopulmonary bypass, and includes repair of subpulmonic or pulmonary artery obstruction when present.
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Service type: Major open congenital cardiac surgery involving intracardiac reconstruction and cardiopulmonary bypass
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Typical site of service: Inpatient hospital, operating room with cardiothoracic surgery and cardiac intensive care support
Clinical & Coding Specifications
Clinical Context
A typical patient is an infant or child diagnosed with d-transposition of the great arteries (d-TGA) with or without a subpulmonic (infundibular) obstruction. The patient presents with cyanosis, differential oxygen saturations, and echocardiographic confirmation of ventriculoarterial discordance with intact ventricular septum or associated defects. Preoperative workup includes transthoracic echocardiography, chest radiograph, electrocardiogram, laboratory studies, and evaluation by pediatric cardiology and cardiothoracic surgery. The patient is taken to the operating room for a planned open-heart procedure under general anesthesia with median sternotomy. Cardiopulmonary bypass is instituted and the surgeon constructs an intra-atrial baffle (Mustard or Senning type) to redirect systemic and pulmonary venous return and relieves any subpulmonic right ventricular outflow tract obstruction by resection of fibrous or muscular bands. Intraoperative transesophageal echocardiography or epicardial echo confirms baffle integrity and flow. Postoperative care occurs in a pediatric or cardiac intensive care unit with mechanical ventilation as needed, inotropic support, rhythm monitoring, and staged follow-up for potential arrhythmia, baffle obstruction, or right ventricular dysfunction. Typical sites of service are the hospital operating room and inpatient cardiac surgical unit. Service type: major cardiac surgical procedure under cardiopulmonary bypass performed by pediatric/cardiothoracic surgical teams.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (placeholder in provided list) |