CPT code 21143 denotes multisegment LeFort I osteotomy procedures used to reconstruct and advance the maxilla for correction of congenital or acquired facial deformities. This code captures a complex craniofacial procedure that affects occlusion, midface projection, and facial symmetry, with implications for surgical planning, postoperative care, and payer authorization due to its complexity and resource intensity. Nationally, accurate coding supports appropriate surgical care coordination and downstream coverage determinations.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. The publication provides readers with benchmarks for utilization and common billing practices, an overview of relevant clinical context for maxillary advancement in a LeFort I procedure, and policy-relevant considerations affecting prior authorization, site-of-service selection, and claims submission. Where specific payer policies are not provided, the report notes that data are not available in the input.

Readers will learn how CPT code 21143 is used to describe multisegment maxillary reconstruction, the typical clinical scenarios that prompt its use, expected surgical setting, and the primary payer stakeholders relevant to national coverage and reimbursement discussions. The guide is intended for coding professionals, surgical practices, and policy analysts seeking concise, nationally focused context on this complex craniofacial procedure.