Summary & Overview
CPT 33947: Veno‑arterial Extracorporeal Circulation Initiation
CPT code 33947 represents the initiation of veno‑arterial extracorporeal circulation (VA ECMO cannulation), a critical invasive procedure that drains venous blood and returns it to the arterial system to provide mechanical circulatory and respiratory support. Nationally, this service is important for management of severe cardiogenic shock, perioperative support during high‑risk cardiac operations, and post‑cardiac transplant stabilization. Use of VA extracorporeal circulation has implications for intensive care resource utilization, procedural coding accuracy, and payer coverage determinations.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context and typical settings for CPT code 33947, an overview of common modifiers and billing considerations, and summaries of payer coverage patterns and benchmark concepts where available. The publication also outlines coding relationships and related service considerations to help billing and clinical teams align documentation with code selection.
This summary is focused on national coding and clinical context; data elements not provided in the input are noted as unavailable where applicable.
Billing Code Overview
CPT code 33947 describes initiation of extracorporeal circulation via a veno–arterial (VA) route, in which venous blood is drained, oxygenated and returned to the arterial system. This procedure establishes mechanical circulatory support and extracorporeal oxygenation for patients with severe cardiac failure or those undergoing complex cardiac or heart transplant procedures.
Service Type
- Service type: Invasive extracorporeal circulatory support initiation (veno‑arterial cannulation)
Typical Site of Service
- Typical site of service: Operative suite or cardiac catheterization/interventional cardiac procedure area within an inpatient hospital setting
Clinical & Coding Specifications
Clinical Context
A 58-year-old male with ischemic cardiomyopathy is in the cardiac operating room following left ventricular assist device placement. During separation from cardiopulmonary bypass he develops refractory cardiogenic shock with severe biventricular failure and escalating vasopressor requirements. The cardiothoracic surgery team initiates veno–arterial extracorporeal membrane oxygenation by placing a venous cannula in the right atrium and an arterial cannula in the ascending aorta to provide temporary mechanical circulatory support. The procedure is performed in the operating room (or hybrid OR/interventional suite) under general anesthesia with invasive hemodynamic monitoring. Documentation includes indication for VA support, cannulation sites and sizes, technique used for cannula insertion (open sternotomy or percutaneous), time of initiation of extracorporeal circulation, perfusion and circuit details, anticoagulation management, and post-initiation hemodynamic and arterial blood gas results. The clinical workflow involves multidisciplinary teams: cardiothoracic surgeon or interventional cardiologist performs cannulation, perfusionist manages the circuit, anesthesiology manages hemodynamics, and intensive care accepts the patient for ongoing ECMO care. Coding is based on the documented initiation of veno–arterial extracorporeal circulation and relevant supporting documentation such as operative note, anesthesia record, and perfusion flowsheet.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Responsible physician |