CPT code 23900 represents a forequarter amputation: surgical removal of the upper extremity together with the scapula and clavicle, typically performed for extensive shoulder girdle malignancies. This high-acuity procedure has significant clinical and resource implications, including complex perioperative care, prolonged inpatient stays, and coordination across surgical oncology, vascular, plastic/reconstructive, and rehabilitative services. Nationally, 23900 is important for tracking utilization of major oncologic amputations and for ensuring appropriate coverage, payment, and care pathways for rare but high-cost cases.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for forequarter amputation, typical sites of service and care settings, common billing modifiers associated with major surgical procedures, and guidance on where to find related coding references. The publication summarizes available benchmarks and payer coverage considerations where data exist, highlights policy and documentation priorities tied to high-complexity surgery, and outlines clinical and administrative factors that affect claims processing and payment. Data not available in the input are noted where applicable.