Summary & Overview
CPT 33732: Repair of Cor Triatriatum or Supravalvular Mitral Ring
CPT code 33732 covers surgical repair of congenital intracardiac membranes: removal of a cor triatriatum or supravalvular mitral ring that restricts intracardiac blood flow. These rare congenital anomalies can produce significant hemodynamic compromise and require definitive surgical correction; coding appropriately captures a specialized cardiothoracic procedure with inpatient operative care and potential perioperative complexity. Nationally, accurate use of this code matters for procedure tracking, resource planning, and claims adjudication for specialized congenital cardiac repairs.
Key payers addressed in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context for the procedure, typical site-of-service expectations, and what to expect in documentation and coding for this operative repair. The publication summarizes benchmarks and policy-relevant considerations affecting coverage and payment for specialized cardiothoracic procedures, highlights areas where documentation commonly affects claims, and provides a concise reference for coding professionals and clinical teams involved in congenital cardiac surgery workflows.
Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and service line specifics.
Billing Code Overview
CPT code 33732 describes a surgical procedure to remove an abnormal intracardiac membrane obstructing normal blood flow: repair of cor triatriatum or supravalvular mitral ring. In cor triatriatum, the atrium is divided by an extra tissue fold into two chambers; in a supravalvular mitral ring, an abnormal membrane on the atrial side of the mitral valve restricts flow from the left atrium to the left ventricle.
Service Type: Cardiac surgical membrane resection / congenital cardiac repair
Typical Site of Service: Inpatient hospital operating room / cardiothoracic surgery suite
Clinical & Coding Specifications
Clinical Context
A 3-year-old child presents with progressive respiratory distress, recurrent pulmonary edema, and failure to thrive. Echocardiography reveals a membrane dividing the left atrium consistent with cor triatriatum sinister, causing significant obstruction to left atrial outflow with elevated pulmonary venous pressures. The cardiac surgery team schedules operative repair under general anesthesia with cardiopulmonary bypass. The clinical workflow includes preoperative imaging (transthoracic and transesophageal echocardiography), cardiology and anesthesia clearance, intraoperative median sternotomy, cardiopulmonary bypass, excision of the intra-atrial membrane (or supravalvular mitral ring) to restore unobstructed flow, intraoperative transesophageal echocardiography to confirm repair, separation from bypass, chest closure, and postoperative monitoring in the pediatric cardiac intensive care unit with serial imaging and anticoagulation management as indicated. Documentation should include precise anatomic description (left vs right atrium, size and location of membrane), indication for surgery, intraoperative findings, technique of membrane excision, cardiopulmonary bypass times, complications if any, and postoperative status.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Not a real CMS modifier (placeholder) | Data not standard; verify payer-specific use before billing |