CPT code 21243 denotes temporomandibular joint (TMJ) arthroplasty using an artificial prosthesis. This reconstructive surgical code captures definitive interventions for severe TMJ disease when conservative care is insufficient. Nationally, TMJ arthroplasty represents a specialized, low-volume but high-resource service with implications for surgical quality, device management, and post-operative care coordination.

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, payment and utilization benchmarks where available, and relevant policy considerations that affect coverage and prior authorization practices. The publication highlights coding nuances, common billing modifiers, and administrative touchpoints impacting claims processing and reimbursement.

This report is intended for health plan analysts, hospital billing leaders, and clinical program managers seeking a clear national perspective on CPT code 21243. It provides background on the procedure, summarizes payer coverage patterns, and outlines areas where policy updates or utilization management frequently arise. Data not available in the input are noted where applicable.