CPT code 21121 identifies an osteotomy genioplasty in which the provider advances the chin bone to correct a receding chin. The procedure is used for cosmetic enhancement and for medical indications such as bite correction and treatment of obstructive sleep apnea, making it clinically and financially significant across surgical and reconstructive care settings. Nationally, this code underpins billing for facial skeletal surgery that intersects cosmetic and functional care pathways, impacting coverage determinations and utilization tracking.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and typical sites of service, plus benchmarking and payer policy considerations relevant to coverage and coding practice. The publication outlines expected reimbursement contexts, common billing considerations, and areas where medical necessity documentation is often required for payer review.

This summary provides a national perspective on clinical indications, service delivery settings, and the administrative considerations that commonly affect payment and prior authorization for procedures coded with 21121. Data not available in the input for specific utilization rates, payer-specific reimbursement amounts, and associated ICD-10 diagnoses are noted where applicable.