CPT code 21142 specifies a two-segment LeFort I maxillary advancement: a surgical reconstruction that mobilizes and advances the tooth-bearing portion of the maxilla and associated midface bones to correct congenital or acquired deformities. The code captures a complex orthognathic procedure that affects occlusion, facial symmetry, and airway or functional outcomes, making it clinically significant for craniofacial surgery and reconstructive specialties.

Key payers included in national coverage discussions are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers can expect a concise briefing on clinical context, common settings where the service is delivered, and how the procedure is represented in billing workflows. The publication summarizes common payer engagement and coding considerations, provides benchmarking context where available, and outlines the clinical indications and procedural scope associated with the code.

This summary is intended to inform clinical leaders, coding professionals, and policy analysts about the nature and billing classification of the procedure, typical sites of service, and what to look for when reviewing claims and coverage policies for orthognathic and midface reconstructive surgery. Data not available in the input: associated taxonomies, specific ICD-10 diagnoses, related codes, and payer-specific reimbursement rates or policies.