Summary & Overview
CPT 33820: Ligation and Closure of Ductus or Major Cardiac Vessel
CPT code 33820 identifies a surgical procedure to repair an opening between the major blood vessels leading from the heart by ligation and suture closure of the ductus or similar vascular opening. This code captures a definitive operative intervention often performed to correct congenital or acquired shunts that can compromise cardiopulmonary function. Nationally, accurate use of this code matters for clinical registries, quality tracking, and facility case mix reporting for cardiac surgery services.
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 the procedure, typical sites of service, and the common modifiers associated with surgical billing for this service. The publication also summarizes national benchmarking and payment considerations where available, highlights coding nuances relevant to operative documentation, and notes areas where input data were not provided.
The piece is intended for health system coding managers, clinical billing teams, and policy analysts who require a clear, nationally oriented reference for CPT code 33820 — its clinical meaning, billing context, and where it fits within surgical service lines and inpatient cardiac care.
Billing Code Overview
CPT code 33820 describes surgical repair of an opening between the major blood vessels leaving the heart by ligation and suture closure of the ductus or other opening. This procedure involves physically closing a vascular communication to restore normal circulation.
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Service type: Surgical correction of congenital or acquired vascular defect involving major cardiac outflow vessels
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Typical site of service: Inpatient operating room or cardiac surgery suite
Clinical & Coding Specifications
Clinical Context
A 2-month-old full-term infant presents with a continuous "machine-like" heart murmur and signs of increased pulmonary blood flow such as tachypnea and poor weight gain. Echocardiography confirms a hemodynamically significant patent ductus arteriosus (PDA) with left-to-right shunt. The cardiothoracic surgery team schedules the infant for surgical PDA ligation when transcatheter closure is not feasible due to patient size or ductal anatomy.
Preoperative workflow includes anesthesia evaluation, informed consent, and baseline labs. The procedure is performed in an operating room under general endotracheal anesthesia via a left posterolateral thoracotomy or a muscle-sparing mini-thoracotomy. The surgeon isolates the ductus between the descending aorta and left pulmonary artery, applies ligatures or sutures to close the ductus, and confirms hemostasis. Intraoperative monitoring includes arterial line and pulse oximetry. Postoperative care occurs in a pediatric intensive care unit or step-down unit with pain control, respiratory support as needed, and follow-up echocardiography to confirm closure. Discharge typically follows clinical stability and feeding tolerance.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Procedure fully complete (carrier-specific) | Rarely used; use only per payer-specific rules when available |