CPT code 21070 designates an open partial or complete coronoidectomy—surgical removal of the coronoid process of the mandible—to treat trauma, ankylosis, arthritis, and other causes of restricted mandibular motion. This code captures a specialized oral/maxillofacial procedure with implications for surgical practice patterns, facility resource use, and coverage policies for reconstructive and functional jaw surgery nationally.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical indications and procedural context, payer coverage patterns, common claim modifiers observed with this service, and benchmark considerations for facility and physician billing lines. The summary highlights where policy guidance and reimbursement rules most commonly affect authorization and coding decisions for operative jaw procedures.

The publication provides practical reference material for clinicians, coding professionals, and policy analysts: a concise description of the procedure and site-of-service expectations, typical payer coverage landscape, and the types of benchmarks and policy updates relevant to providers billing this code. Data not available in the input is noted where applicable.