CPT code 21123 covers sliding genioplasty with autologous bone graft augmentation of the chin, a surgical procedure used to improve facial aesthetics or address functional conditions such as obstructive sleep apnea. This code represents a specialized maxillofacial operation that can affect airway mechanics and facial profile, making it relevant to plastic surgery, oral and maxillofacial surgery, and sleep medicine. Nationally, accurate coding for 21123 matters for appropriate clinical documentation, surgical quality measurement, and payer policy alignment.

Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical intent of the procedure, where it is typically performed, common modifiers associated with surgical services, and the payer landscape relevant to coverage and claims processing. The publication provides benchmarks for utilization and reimbursement patterns where available, clarifies coding boundaries for related facial osteotomies, and summarizes policy considerations that influence preauthorization and medical necessity determinations.

Data not available in the input: associated taxonomies, specific ICD-10 diagnoses, related codes, and payer-specific coverage edits. The content is intended for a national audience of clinicians, coding professionals, and policy analysts.