CPT code 20802 denotes surgical replantation or reattachment of a completely amputated arm, a high-acuity, major open procedure performed in hospital operating rooms, typically within trauma and reconstructive surgical services. This code matters nationally because it captures resource-intensive, time-sensitive care with implications for surgical staffing, trauma system readiness, and high-cost perioperative care. Key payers included in the national context are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical scope and typical care setting for this procedure, common payer coverage considerations, and the operational and coding context that affects billing and reimbursement. The publication provides benchmarks where available, summarizes relevant policy considerations for commercial and public payers, and outlines the clinical context for emergency and reconstructive teams involved in limb reattachment. Data not available in the input is noted where applicable.