Summary & Overview
CPT 33956: Central Cannula Insertion for Extracorporeal Circulation, Pediatric
CPT code 33956 identifies the open insertion of a central cannula via sternotomy or thoracotomy in children aged six years and older to establish extracorporeal circulation. This code covers a high-acuity cardiothoracic surgical procedure that enables cardiopulmonary bypass or extracorporeal life support during complex cardiac operations. Nationally, accurate coding for this procedure is important for clinical documentation, surgical case grouping, and appropriate payment for pediatric cardiac surgery.
Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. The publication provides a concise review of the clinical context for CPT code 33956, outlines typical sites of service and procedural indications, and summarizes commonly applied modifiers where available. Readers will find benchmarks for coding practice, notes on clinical documentation elements that support appropriate use of the code, and a summary of policy considerations affecting coverage and billing for high-acuity pediatric cardiothoracic procedures. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 33956 describes the insertion of a central cannula through an open approach (sternotomy or thoracotomy) in a child six years and older for extracorporeal circulation. This procedure is a surgical technique used to establish central vascular access to support cardiopulmonary bypass or other forms of extracorporeal life support during cardiac or thoracic surgery in pediatric patients.
Service Type: Surgical — Cardiothoracic open procedure
Typical Site of Service: Inpatient operating room or cardiac surgery suite
Clinical & Coding Specifications
Clinical Context
A typical patient is a pediatric cardiac surgery candidate aged six years or older presenting with congenital or acquired cardiac disease requiring cardiopulmonary bypass support. Common indications include correction of congenital heart defects (for example, ventricular septal defect repair, tetralogy of Fallot, or valvular reconstruction), removal of intracardiac masses, or complex reoperative procedures. The patient undergoes preoperative evaluation by pediatric cardiology and cardiothoracic surgery, including echocardiography, cross-sectional imaging as indicated, laboratory studies, and anesthesiology assessment.
In the operating room, a median sternotomy or thoracotomy is performed under general anesthesia. The surgical team inserts a central cannula into the right atrium, aorta, or other central intrathoracic vessel via an open approach to establish arterial and/or venous access for extracorporeal circulation. Perfusionist-managed cardiopulmonary bypass is initiated for cardiac decompression and myocardial protection while the surgeon performs the definitive repair. Post-bypass, the cannula is removed and hemostasis achieved before chest closure. The postoperative workflow includes monitoring in a pediatric cardiac intensive care unit with continued hemodynamic support, ventilation management, and surveillance for bleeding, infection, and organ dysfunction.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier used/standard |