CPT® Code 24115

The procedure described by CPT® Code 24115 involves the excision or curettage of a bone cyst or benign tumor located in the humerus, which is the long bone of the upper arm. A bone cyst is defined as a fluid-filled space within the bone, and it can be classified into various types. One common type is the unicameral or simple bone cyst, which is generally considered benign. Another type, the aneurysmal bone cyst, is characterized by vascular tissue surrounding a blood-filled cystic lesion. In addition to cysts, there are several types of benign bone tumors, including giant cell tumors, chondromyxoid fibromas, and enchondromas. During the procedure, an incision is made over the site of the lesion in the humeral shaft or distal humerus. The soft tissues are carefully dissected to expose the lesion. If a cystic lesion is identified, the bone is incised, and a bone window is created to access the cyst. The fluid within the cyst is aspirated and sent for laboratory analysis. A curette is then inserted through the bone window to completely remove the lining of the cystic cavity. In cases where a benign tumor is present, the lesion is excised along with a margin of surrounding healthy bone. Following the excision or curettage, the physician obtains healthy bone, either from the same site or from a separate location, such as the iliac crest, to use as an autograft. This autograft is then packed into the defect created in the humeral shaft or distal humerus, facilitating healing and structural support.