CPT® Code 28100

The CPT® Code 28100 refers to the excision or curettage of a bone cyst or benign tumor located in the talus or calcaneus, which are bones in the foot. A bone cyst is defined as a fluid-filled space within the bone, and it can be classified into various types. The unicameral or simple bone cyst is the most common type, characterized as a benign lesion that typically does not cause significant problems. In contrast, an aneurysmal bone cyst is less common and is composed of vascular tissue surrounding a blood-filled cystic lesion. Additionally, there are several types of benign bone tumors, including giant cell tumors, chondromyxoid fibromas, and enchondromas, which may also necessitate surgical intervention. In the procedure described by CPT® Code 28100, the surgeon makes an incision over the lesion site on the talus or calcaneus. The soft tissues are carefully dissected to expose the lesion. If a cystic lesion is identified, the surgeon incises the bone to create a window, allowing access to the cyst. The fluid within the cyst is aspirated and sent for laboratory analysis, which is reported separately. A curette is then inserted through the created window to completely remove the lining of the cystic cavity. In cases where a benign tumor is present, the procedure involves excising the tumor along with a margin of healthy bone to ensure complete removal. This surgical approach is critical for addressing both cystic lesions and benign tumors in the specified bones of the foot.