CPT code 42821 denotes a combined tonsillectomy and adenoidectomy performed on patients aged 12 years or older. This common otolaryngology surgical code is used nationally for documenting and billing removal of both tonsils and adenoids in adolescent and adult patients. The code matters because it captures a frequently performed ENT operation with implications for surgical utilization, facility resource planning, and payer coverage policies.

Key payers covered in this publication include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for when combined tonsillectomy and adenoidectomy is performed, typical sites of service such as hospital operating rooms and ambulatory surgery centers, and common billing considerations tied to this procedure. The report outlines benchmarks and comparative metrics where available, summarizes relevant policy and coverage updates affecting prior authorization and payment, and highlights coding notes important for accurate claim submission.

This executive summary is aimed at payers, provider billing teams, and health policy analysts seeking a concise national perspective on utilization and billing practice for CPT code 42821 and the operational and policy factors that influence claims and reimbursement.