CPT® Code 21199

The procedure described by CPT® Code 21199 involves a surgical intervention known as a segmental osteotomy of the mandible, specifically with the advancement of the genioglossus muscle. This procedure is performed to correct a localized deformity of the mandible, which is the lower jawbone. The term 'osteotomy' refers to the surgical cutting of bone, and in this case, it is segmental, meaning that a specific segment of the mandible is targeted for correction. The process begins with the physician making an incision over the area where the deformity is located. Following this, the surrounding tissue is carefully reflected to expose the bone segment that requires modification. To remove the deformed segment of bone, the surgeon utilizes various surgical instruments, including saws, drills, and osteotomes, which are specialized tools designed for cutting bone. Once the deformed segment is excised, the mandible is repositioned and stabilized using fixation devices such as wires, screws, metal plates, or an acrylic splint. This stabilization is crucial for ensuring proper healing and alignment of the jaw. Additionally, if the procedure includes the advancement of the genioglossus muscle, which is a muscle located at the base of the tongue, it is specifically coded under CPT® Code 21199. Finally, after the surgical modifications are completed, all incisions made during the procedure are meticulously closed to promote healing and minimize complications.