Summary & Overview
CPT 21121: Genioplasty (Chin Advancement)
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.
Billing Code Overview
CPT code 21121 describes a genioplasty procedure in which a provider incises the jaw bone and advances the chin segment to change the appearance of a receding chin. The procedure is performed to improve cosmetic appearance or for medical necessity, such as correcting occlusion (bite) problems or treating obstructive sleep apnea.
Service Type: Surgical procedure — reconstructive/orthognathic facial surgery
Typical Site of Service: Hospital operating room or outpatient surgical center
Clinical & Coding Specifications
Clinical Context
A 29-year-old adult presents to a facial plastic and reconstructive surgery clinic requesting correction of a receding chin for improved facial balance and to address malocclusion contributing to temporomandibular joint symptoms. The patient has completed preoperative orthodontic evaluation, 3D imaging (panoramic radiograph and CT facial bones), and surgical consultation. The surgeon discusses goals of advancing the mandibular symphysis and plans an intraoral osteotomy with advancement and fixation (sliding genioplasty). The procedure is performed in an outpatient ambulatory surgery center under general anesthesia. The clinical workflow includes preoperative clearance (medical history, cardiac risk assessment if indicated), informed consent noting cosmetic and functional indications, intraoperative osteotomy of the anterior mandible with rigid fixation, postoperative recovery with analgesia and antibiotics as indicated, and scheduled follow-up visits for wound check and occlusion assessment. Medical necessity documentation is required when performed to correct bite abnormalities, treat obstructive sleep apnea, or repair functional deficits; cosmetic-only indications require appropriate consent and potential separate payer policies.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typical for sliding genioplasty (e.g., significant scar revision, complex osteotomy). |