CPT 33257 Atrial Ablation Reimbursement & Policy | OpenPayer

Summary & Overview

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

CPT code 33257 denotes an add-on cardiac surgical procedure performed at the same time as another cardiac operation to ablate abnormal atrial tissue and reconstruct the left and right atria for treatment of atrial fibrillation. As an adjunct to primary cardiac surgeries, this code captures the incremental work of atrial tissue destruction and chamber reconstruction and is relevant for surgical billing, quality reporting, and perioperative resource planning nationwide. Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context on the procedure’s purpose and typical setting, payer coverage considerations, commonly associated modifiers, and related coding topics to support accurate claim submission and auditing. The publication also outlines common billing scenarios where this add-on code applies during concomitant procedures and highlights documentation elements that typically accompany surgical atrial ablation and reconstruction claims. Data not available in the input for specific payer rates, associated taxonomies, and ICD-10 diagnosis pairings are noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare33257CPTcardiac surgeryatrial fibrillationatrial ablationadd-on procedureoperative codinginpatient surgery

Billing Code Overview

CPT code 33257 is an add-on cardiac surgical procedure performed concurrently with another cardiac operation. The procedure involves destruction of abnormal atrial tissue responsible for arrhythmia, followed by reconstruction of the left and right atria (the heart chambers that receive venous blood). This operation is used to treat atrial fibrillation, a condition characterized by rapid, irregular electrical activity in the atria.

Service type: Cardiac surgical add-on procedure involving atrial tissue ablation and atrial reconstruction
Typical site of service: Inpatient operating room during concomitant cardiac surgery (e.g., valve repair or coronary artery bypass grafting)

Clinical & Coding Specifications

Clinical Context

A 68-year-old patient with persistent atrial fibrillation is scheduled for elective cardiac surgery for mitral valve repair. During the planned open-heart procedure, the cardiothoracic surgeon performs a concomitant surgical atrial fibrillation ablation and reconstruction of the left and right atria to restore sinus rhythm and reduce symptomatic arrhythmia burden. The workflow includes preoperative evaluation with transthoracic and transesophageal echocardiography, anticoagulation planning, intraoperative cardiopulmonary bypass and cardioplegia, surgical ablation using radiofrequency or cryoablation applied to atrial tissue, left and right atrial reconstruction (including closure or modification of atrial appendages and lesion sets), intraoperative electrophysiology confirmation of conduction block as appropriate, hemostasis, and standard postoperative monitoring in the intensive care unit with telemetry and rhythm assessment before discharge.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work, time, or complexity of the ablation/atrial reconstruction is substantially greater than typical.
`23`	Unusual anesthesia

CPT 33250: Cardiac Arrhythmia Ablation Without Bypass

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

CPT 33254: Atrial Ablation with Left and Right Atrial Reconstruction

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

CPT 33268: Left Atrial Appendage Exclusion, Open Cardiac Surgery

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

CPT 33259: Extensive Atrial Ablation and Reconstruction

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

CPT 33267: Left Atrial Appendage Exclusion, Open Surgical Procedure

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

CPT 33255: Atrial Ablation and Reconstruction, Off‑Pump

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

CPT 33264: Implantable Defibrillator Pulse Generator Removal and Replacement

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

CPT 33261: Surgical Ventricular Ablation with Cardiopulmonary Bypass

CPT-33256-ATRIAL-ABLATION-ATRIAL-RECONSTRUCTION

CPT 33256: Atrial Ablation with Left and Right Atrial Reconstruction

CPT-33251-CARDIAC-ABLATION-WITH-CARDIOPULMONARY-BYPASS

CPT 33251: Surgical Cardiac Ablation With Cardiopulmonary Bypass

Showing 1–10 of 11

Taxonomy Code	Specialty	Notes
207P00000X	Cardiothoracic Surgery	Primary specialty performing open surgical atrial ablation and atrial reconstruction.
207RH0000X	Thoracic Surgery	Surgeons with thoracic specialty who perform cardiac procedures in some centers.
207RC0000X	Cardiovascular Surgery	Cardiac surgeons performing valve repair/replacement and concomitant arrhythmia surgery.
207RP0000X	Adult Congenital Cardiovascular Disease	In select patients with congenital atrial pathology requiring surgical ablation.
207L00000X	Physician Assistant	May assist in perioperative management and documentation; not primary reporting provider.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I48.0`	Paroxysmal atrial fibrillation	Common indication for surgical atrial ablation to control recurrent AF episodes.
`I48.1`	Persistent atrial fibrillation	Typical indication when concomitant cardiac surgery is planned and ablation is performed to restore sinus rhythm.
`I48.2`	Chronic atrial fibrillation	Longstanding AF where surgical ablation may be considered during other cardiac surgery.
`I48.91`	Unspecified atrial fibrillation	Used when AF is documented but not further specified; relevant as an indication for ablation.
`I48.3`	Typical atrial flutter	May coexist with AF or be targeted during surgical arrhythmia procedures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33257`	Surgical ablation of atrial tissue with reconstruction of the atria (add-on)	This is the add-on code describing destruction of abnormal atrial tissue and reconstruction of left and right atria when performed at the same time as another cardiac procedure.
`33426`	Repair or replacement, mitral valve, with cardiopulmonary bypass	Common primary cardiac procedure during which `33257` may be reported as an add-on when atrial ablation/reconstruction is performed concurrently.
`33405`	Coronary artery bypass, using arterial graft(s), with cardiopulmonary bypass	CABG is a frequent concomitant cardiac procedure; `33257` may be added when atrial ablation/reconstruction is performed during CABG.
`33249`	Ablation, open, for ventricular tachycardia or other arrhythmia (not AF)	Other open surgical arrhythmia procedures that may be performed in the same operative session; distinct reporting based on arrhythmia targeted.
`33233`	Insertion of temporary transvenous pacing electrode, intraoperative	May be used for intraoperative or immediate postoperative pacing support during or after atrial reconstruction.

OpenPayer