CPT® Code 27637

The CPT® Code 27637 refers to the procedure involving the excision or curettage of a bone cyst or benign tumor located in the tibia or fibula, 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, the aneurysmal bone cyst is less common and is composed of vascular tissue surrounding a blood-filled cystic lesion. Additionally, there are various benign bone tumors, including giant cell tumors, chondromyxoid fibromas, and enchondromas. The procedure begins with an incision made over the lesion site in the tibia or fibula, 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. Following the removal of the lesion, the procedure involves obtaining healthy bone, either from the same site or from a donor site such as the iliac crest, which is then packed into the defect created in the tibia or fibula. This comprehensive approach ensures the effective treatment of the bone cyst or benign tumor while promoting healing through the use of the autograft.