CPT code 21194 represents surgical reconstruction of the perpendicular portions (rami) of the mandible using the patient’s own bone graft to correct facial deformities, often due to trauma. This code captures a complex reconstructive facial surgery that has implications for surgical billing, preauthorization practices, and post-operative care coordination nationally. Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will gain a concise clinical and billing context for 21194, including typical sites of service (hospital operating room or outpatient surgical center), common modifiers used by payers, and areas where policy updates or prior authorization practices commonly affect coverage and claims processing. The publication also summarizes benchmarks and payer patterns where available and highlights operational considerations for coding and claim submission. Data not available in the input is noted where applicable.