CPT code 33340 defines percutaneous transcatheter implantation of a left atrial appendage occlusion device delivered via a catheter across the atrial septum, with fluoroscopic guidance and angiographic visualization as needed. This procedure is a minimally invasive alternative to surgical approaches for excluding the left atrial appendage, a common source of thromboembolism in patients with atrial fibrillation. Nationally, utilization of device-based left atrial appendage occlusion has implications for stroke prevention strategies, specialty procedural volumes, and hospital-based interventional cardiology capacity.

Key payers in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The summary addresses coverage and billing patterns observed with these major public and private payers and highlights areas where policy language and prior authorization practices commonly influence access.

Readers will find concise clinical context describing the procedure, benchmarks for site-of-service utilization and typical care settings, and an outline of payer coverage themes and documentation expectations. The publication also summarizes recent policy updates and billing considerations relevant to coding, medical necessity documentation, and imaging interpretation that often accompany claims for this procedure. Data not available in the input are noted where applicable.