Summary & Overview
CPT 33251: Surgical Cardiac Ablation With Cardiopulmonary Bypass
CPT code 33251 represents a surgical cardiac ablation procedure in which a targeted area of heart tissue above the ventricles is destroyed to correct an abnormal heart rhythm while the patient is supported on cardiopulmonary bypass. This code captures complex, operative management of arrhythmias that require open or invasive access and bypass support, distinguishing it from percutaneous or catheter-based ablation approaches. Nationally, the code matters because it corresponds to high-acuity surgical care with substantial resource use and specialized facility and staffing requirements. Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn clinical context for when this service is used, expected site-of-service settings, and how the code is positioned relative to other arrhythmia treatments. The publication provides benchmarks and utilization context where available, concise policy updates affecting billing and coverage for operative cardiac ablation with bypass, and practical notes on documentation elements that support coding and medical necessity determinations. Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and payer-specific coverage rules are noted as not provided.
Billing Code Overview
CPT code 33251 describes a surgical procedure in which a provider destroys a small area of heart tissue above the ventricles that is causing an abnormal heart rhythm. The procedure is performed with the patient placed on cardiopulmonary bypass to maintain circulation and oxygenation during the intervention.
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Service type: Surgical cardiac ablation with open or invasive access using cardiopulmonary bypass
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Typical site of service: Inpatient operating room or cardiac surgery suite with cardiopulmonary bypass capability
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with symptomatic supraventricular tachyarrhythmia refractory to medical therapy is scheduled for a surgical cryoablation of the atrioventricular (AV) node region while on cardiopulmonary bypass. The patient presents with recurrent episodes of rapid ventricular response, hemodynamic instability, and failed catheter-based ablation attempts or anatomic considerations that favor an open surgical approach. Preoperative workflow includes cardiology and cardiothoracic surgery evaluation, informed consent detailing the need for cardiopulmonary bypass and potential pacemaker dependency after AV nodal modification, preoperative anesthesia assessment, and placement of invasive monitoring.
Intraoperative workflow: the patient is induced under general anesthesia, cardiopulmonary bypass is established, and the surgeon exposes the right atrial/AV junction. Targeted destruction (cryoablation or surgical lesion) of a small area above the ventricles (near the AV node or its inputs) is performed to eliminate the arrhythmogenic focus. If AV conduction is interrupted, an epicardial or transvenous permanent pacemaker may be implanted during the same operative setting. Postoperative care includes monitoring in a cardiac ICU, telemetry for rhythm surveillance, management of anticoagulation as indicated, and pacemaker programming if implanted. Typical recovery involves monitoring for procedural complications (bleeding, infection, stroke, conduction block) and a hospital stay appropriate to cardiothoracic surgery with cardiopulmonary bypass.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 |