Summary & Overview
CPT 33266: Endoscopic Maze Procedure for Atrial Fibrillation (No Bypass)
CPT code 33266 represents an endoscope-assisted maze procedure that uses surgical ablation to destroy atrial tissue and reconstruct the left and right atria without cardiopulmonary bypass, performed to treat atrial fibrillation and restore normal sinus rhythm. This code is clinically significant because it covers a specialized, minimally invasive cardiac surgical approach distinct from open-heart maze procedures that require bypass; its proper use affects hospital procedural coding, cardiac surgical reporting, and payment classification nationwide. Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and the service type, plus guidance on commonly reported modifiers. The publication presents benchmarking and payer coverage considerations, highlights coding nuances that distinguish this off-bypass endoscopic maze from other atrial fibrillation surgeries, and summarizes implications for hospital billing workflows and claim review. It also outlines where additional clinical or claims data would be needed for payer policy comparison and reimbursement benchmarking. Data not available in the input for Associated Taxonomies, ICD-10 Diagnoses, Related Codes, and Service Line.
Billing Code Overview
CPT code 33266 describes an endoscope-assisted maze procedure to ablate atrial tissue and reconstruct the left and right atria without the use of cardiopulmonary bypass. The procedure is performed to treat atrial fibrillation and to restore normal cardiac rhythm by creating controlled lesions in the atrial tissue.
Service type: Surgical — minimally invasive cardiac ablation/atrial reconstructive procedure
Typical site of service: Hospital operating room or cardiac surgery suite (inpatient or outpatient surgical setting)
Data not available in the input for Associated Taxonomies, ICD-10 Diagnoses, Related Codes, and Service Line.
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with symptomatic, persistent atrial fibrillation refractory to medical rhythm-control therapy is evaluated for a surgical ablation. He has failed at least one antiarrhythmic medication, has symptomatic palpitations and decreased exercise tolerance, and echocardiography shows preserved left ventricular function with left atrial enlargement. The cardiac surgeon and electrophysiologist discuss a minimally invasive, thoracoscopic Cox-Maze procedure without cardiopulmonary bypass to perform epicardial ablation lines and reconstruct the left and right atria using an endoscope. The patient is admitted on the day of surgery to a hospital operating room or hybrid electrophysiology suite, undergoes general endotracheal anesthesia, single-lung ventilation for thoracoscopic access, and intraoperative transesophageal echocardiography for guidance. The procedure involves epicardial ablation of atrial tissue, exclusion or closure of the left atrial appendage as indicated, testing for entrance and exit block, and confirmation of sinus rhythm restoration. Postoperatively the patient transfers to a monitored cardiac step-down or intensive care unit for rhythm and hemodynamic monitoring, anticoagulation management, and early mobilization prior to discharge typically within several days if uncomplicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
62 | Two surgeons | Use when two surgeons of different specialties work together as primary surgeons during the procedure. |