CPT® Code 23155

The CPT® Code 23155 refers to the surgical procedure involving the excision or curettage of a bone cyst or benign tumor located in the proximal humerus, accompanied by the use of an autograft. A bone cyst is defined as a fluid-filled cavity within the bone, which can vary in type. The unicameral or simple bone cyst is the most common, characterized as a benign lesion. In contrast, an aneurysmal bone cyst is less common and consists of vascular tissue surrounding a blood-filled cystic lesion. Additionally, there are various types of benign bone tumors, including giant cell tumors, chondromyxoid fibromas, and enchondromas. The procedure begins with an incision made over the lesion site in the proximal humerus, followed by dissection of the soft tissues to expose the lesion. If a cystic lesion is identified, the bone is incised to create a window, allowing for the aspiration of fluid, which is then sent for laboratory analysis. The lining of the cystic cavity is removed through curettage, or the benign tumor may be excised along with a margin of healthy bone. In the case of CPT® Code 23155, after the lesion is treated, the physician obtains healthy bone either from the same site or from a different location, such as the iliac crest, to use as an autograft. This graft is then packed into the defect created in the proximal humerus, facilitating healing and structural integrity of the bone.