CPT code 33255 denotes an off-pump surgical procedure that destroys extensive atrial tissue responsible for abnormal electrical activity and reconstructs both the left and right atria to treat atrial fibrillation. This invasive cardiac surgical ablation is clinically significant as a rhythm-control option for patients with complex or refractory atrial fibrillation who are candidates for open surgical intervention without cardiopulmonary bypass. Nationally, the code matters for hospitals and cardiovascular surgery programs managing resource use, operative planning, and documentation for complex arrhythmia care.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The content outlines clinical context, expected site-of-service considerations, and the administrative elements that affect coding and billing workflows.

Readers will find a concise overview of the clinical indication and procedure intent, descriptions of the typical service setting, and a guide to what to expect in related billing and policy materials. The publication summarizes benchmarks and payment policy context where available, highlights documentation priorities tied to the procedure description, and notes where input data was not provided. This national-level summary is intended for billing managers, cardiovascular surgeons, hospital administrators, and policy analysts seeking a clear understanding of CPT code 33255 and its role in managing atrial fibrillation with an off-pump surgical approach.