CPT® Code 24900

The CPT® Code 24900 refers to the surgical procedure of amputation of the arm through the humerus, specifically with primary closure. This procedure is categorized as an above-elbow amputation, which can be performed at various levels: high, middle, or low. A high amputation occurs at the proximal metaphysis above the deltoid tuberosity, a middle amputation is performed along the diaphysis, and a low amputation is done at the supracondylar level. During the procedure, the patient is positioned with the shoulder slightly elevated on the operative side to facilitate access to the arm. The surgical team marks the incision lines for the skin and muscle flaps on the skin surface, typically utilizing an anterior/posterior fishmouth flap technique. This method involves making incisions that are perpendicular to the skin surface, allowing for the careful dissection of underlying soft tissue, where blood vessels and nerves are identified and managed. The procedure requires meticulous attention to detail to ensure that large blood vessels are mobilized, ligated, and divided, while nerves are also carefully handled to prevent complications. The muscles are transected along the marked flap lines, and the humerus is exposed for transection at the level of the periosteal flaps. The remaining bone is then covered with sutured muscle flaps, ensuring that the humerus is completely enveloped in muscle tissue, which may be reinforced with synthetic tape to stabilize the muscle. Post-operative care includes the placement of drains, closure of the subcutaneous fascia and skin, and the application of a rigid dressing to manage pain and prevent edema.