CPT 33256 Atrial Ablation Reimbursement | OpenPayer

Summary & Overview

CPT 33256: Atrial Ablation with Left and Right Atrial Reconstruction

CPT code 33256 represents an open surgical atrial ablation with reconstruction of the left and right atria performed for treatment of atrial fibrillation, using cardiopulmonary bypass. This complex, invasive cardiac procedure is significant nationally because it is reserved for patients with extensive atrial disease or when less invasive catheter-based strategies are unsuitable. It involves cardiothoracic surgical teams and inpatient perioperative care, with implications for hospital resource use and surgical quality measures.

Key payers in the national analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, an overview of typical sites of service and care setting, and guidance on the types of benchmarks and policy topics that commonly apply to high-acuity cardiac surgical services. The publication outlines payment and utilization considerations relevant to hospitals and cardiothoracic practices, highlights common modifiers used in surgical coding (listed separately), and notes where input data was unavailable.

The content is intended to inform clinicians, billing professionals, and policy analysts about the clinical intent of 33256, expected care setting, and the payer landscape covered in the analysis. Data not available in the input includes associated taxonomies, specific ICD-10 diagnoses, related codes, and detailed service-line metrics.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 33256atrial fibrillationcardiac surgeryatrial ablationinpatient surgical procedurecardiopulmonary bypasscardiothoracic surgery

Billing Code Overview

CPT code 33256 describes a surgical procedure that destroys extensive atrial tissue responsible for abnormal electrical activity and then reconstructs the left and right atria. The operation is performed to treat atrial fibrillation, an arrhythmia in which the atria contract rapidly and irregularly. The procedure requires placement of the patient on cardiopulmonary bypass during surgery.

Service Type: Surgical cardiac ablation with atrial reconstruction (open heart procedure)

Typical Site of Service: Inpatient hospital operating room with cardiothoracic surgery capability

Clinical & Coding Specifications

Clinical Context

A 68-year-old patient with persistent symptomatic atrial fibrillation refractory to rate control and antiarrhythmic therapy is scheduled for a surgical Cox-Maze IV (biatrial) ablation with reconstruction of the left and right atria under cardiopulmonary bypass. The patient presents preoperatively with palpitations, exertional dyspnea, and an enlarged left atrium on echocardiography. Preoperative workflow includes cardiac evaluation by cardiology and cardiothoracic surgery, transthoracic and transesophageal echocardiography to assess atrial thrombus, anticoagulation management, informed consent, and anesthesia evaluation. Intraoperative steps include median sternotomy or other surgical approach, institution of cardiopulmonary bypass, delivery of surgical ablation lesions to both atria to interrupt macroreentrant and focal atrial fibrillation circuits, reconstruction/closure of atrial tissue as indicated, possible left atrial appendage exclusion, and intraoperative rhythm assessment. Postoperative care involves monitoring in a cardiac intensive care unit, rhythm surveillance, anticoagulation management, and staged follow-up with cardiology for arrhythmia management and anticoagulation decisions.

Coding Specifications

Modifier	Description	When to Use
`62`	Two surgeons	Use when two surgeons work together as primary surgeons, commonly for complex reoperative or combined procedures.

CPT 33250: Cardiac Arrhythmia Ablation Without Bypass

CPT-33267-LEFT-ATRIAL-APPENDAGE-EXCLUSION-OPEN-SURGERY

CPT 33267: Left Atrial Appendage Exclusion, Open Surgical Procedure

CPT-33268-LEFT-ATRIAL-APPENDAGE-EXCLUSION-OPEN-SURGERY

CPT 33268: Left Atrial Appendage Exclusion, Open Cardiac Surgery

CPT-33264-IMPLANTABLE-DEFIBRILLATOR-PULSE-GENERATOR-REPLACEMENT-THREE-CHAMBER

CPT 33264: Implantable Defibrillator Pulse Generator Removal and Replacement

CPT-33259-EXTENSIVE-ATRIAL-ABLATION-AND-RECONSTRUCTION

CPT 33259: Extensive Atrial Ablation and Reconstruction

CPT-33261-CARDIAC-VENTRICULAR-ABLATION-CARDIOPULMONARY-BYPASS

CPT 33261: Surgical Ventricular Ablation with Cardiopulmonary Bypass

CPT-33255-ATRIAL-ABLATION-AND-ATRIAL-RECONSTRUCTION-OFF-PUMP

CPT 33255: Atrial Ablation and Reconstruction, Off‑Pump

CPT-33254-ATRIAL-ABLATION-AND-ATRIAL-RECONSTRUCTION

CPT 33254: Atrial Ablation with Left and Right Atrial Reconstruction

CPT-33258-ATRIAL-FIBRILLATION-ATRIAL-RECONSTRUCTION-NO-BYPASS

CPT 33258: Surgical Atrial Ablation with Extensive Atrial Reconstruction

CPT-33257-ATRIAL-ABLATION-AND-RECONSTRUCTION-ADD-ON

CPT 33257: Atrial Tissue Ablation and Atrial Reconstruction (Add-On)

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Taxonomy Code	Specialty	Notes
207L00000X	Cardiothoracic Surgery	Primary specialty performing surgical atrial ablation/Cox-Maze procedures.
207RC0000X	Interventional Cardiology	May be involved perioperatively for electrophysiology consultation or hybrid procedures.
207RR0502X	Cardiac Electrophysiology	Electrophysiologists collaborate on lesion sets, mapping, and perioperative rhythm management.
208100000X	Anesthesiology	Cardiac anesthesiologists manage cardiopulmonary bypass and intraoperative hemodynamics.
163WL0500X	Cardiac Surgery Assistant	Physician assistants or surgical assistants billing under appropriate taxonomy.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I48.0`	Paroxysmal atrial fibrillation	Common indication for surgical ablation when symptomatic and refractory to other therapies.
`I48.1`	Persistent atrial fibrillation	Major indication for a Cox-Maze surgical ablation with atrial reconstruction.
`I48.2`	Chronic atrial fibrillation	Longstanding AF often addressed with surgical lesion sets and atrial reconstruction.
`I50.1`	Left ventricular failure	Concomitant heart failure that may coexist and affect operative planning and outcomes.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina	May coexist; many patients undergoing cardiac surgery have ischemic heart disease.
`Z95.0`	Presence of cardiac pacemaker	Prior device presence may influence surgical approach and is relevant to perioperative planning.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33256`	Surgical ablation of atrial tissue with reconstruction of left and right atrium; performed with cardiopulmonary bypass (Cox-Maze IV-type procedure)	Primary procedure describing extensive biatrial surgical ablation with atrial reconstruction performed on cardiopulmonary bypass.
`33405`	Repair of atrial or ventricular septal defect with cardiopulmonary bypass	May be performed concurrently if structural intracardiac defects requiring repair are present during the same operation.
`33340`	Removal of cardiac device or foreign body, open; with cardiopulmonary bypass	Relevant when device removal is required in the same operative setting prior to ablation.
`33208`	Insertion or replacement of permanent pacemaker pulse generator (atrial and ventricular leads)	May be performed before or after ablation when pacing or bradyarrhythmia management is needed.
`33426`	Excision or resection of cardiac tumor with cardiopulmonary bypass	Performed in the same operative session if a mass requires resection in conjunction with atrial surgery.
`0174U`	(Unlisted cardiac surgery procedures)	Used for reporting additional cardiac surgical services not otherwise specified when needed for billing completeness.

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