CPT® Code 20933

Add-On Code

Allograft, includes templating, cutting, placement and internal fixation, when performed; hemicortical intercalary, partial (ie, hemicylindrical) (List separately in addition to code for primary procedure)

The CPT® Code 20933 refers to the procedure of allografting, which involves the use of donor tissue to reconstruct a bone or soft tissue deficit. This procedure is particularly relevant in cases where there is a need to address significant bone loss due to various medical conditions such as tumors, osteochondral cysts, posttraumatic or degenerative arthritis, traumatic injuries, or avascular necrosis. The primary goal of this intervention is to prevent limb amputation and to preserve the functionality of the limb. The allograft utilized in this procedure is typically derived from cadaveric sources and is composed of bone, cartilage, or other tissues that closely resemble the anatomical structure of the tissue being replaced. During the allografting process, the affected area is accessed surgically, and the damaged or diseased tissue is resected down to viable, healthy bone or tissue. The allograft is then meticulously sculpted to match the contours of the removed tissue, using the excised bone or tissue as a template. Once shaped, the allograft is inserted into the prepared site and secured in place using various fixation methods, which may include rods, cerclage wires, intramedullary nails, plates, or screws. The procedure can involve either a partial (hemicortical or hemicylindrical) or complete (cylindrical) intercalary allograft, depending on the extent of the bone deficit. In the case of hemicortical intercalary allografting, the diaphyseal portion of the bone is resected while preserving the length of the bone, allowing for the allograft to be attached in the area of the partial deficit. Conversely, complete intercalary allografting involves the total removal of a section of the diaphyseal bone, with the allograft bridging the gap between the remaining ends of the native bone. It is important to note that this code is used in conjunction with the primary procedure code for radical resection of the diseased bone or joint or for implant removal.