CPT® Code 27635

The procedure described by CPT® Code 27635 involves the excision or curettage of a bone cyst or benign tumor located in the tibia or fibula. A bone cyst is defined as a fluid-filled space within the bone, which can vary in type. The unicameral or simple bone cyst is the most common form, characterized as a benign lesion. Another type, the aneurysmal bone cyst, is less common and consists of vascular tissue that surrounds a blood-filled cystic lesion. Additionally, there are various benign bone tumors, including giant cell tumors, chondromyxoid fibromas, and enchondromas. During the procedure, an incision is made over the lesion site on the tibia or fibula, allowing for dissection of the soft tissues to expose the lesion. If a cystic lesion is identified, the bone is incised to create a window, enabling access to the cyst. The fluid within the cyst is aspirated and sent for laboratory analysis. A curette is then utilized to remove the lining of the cystic cavity completely. In cases where benign tumors are present, the procedure may involve excising the tumor along with a margin of healthy bone. This comprehensive approach ensures that the lesion is adequately addressed while minimizing the risk of recurrence.