Aneurysmal bone cyst, right ankle and foot

This code signifies the presence of an aneurysmal bone cyst (ABC) affecting the bones of the right ankle or foot. An ABC is a benign, expansile, osteolytic bone lesion characterized by blood-filled spaces separated by fibrous septa. It typically presents as a rapidly growing mass causing pain and swelling.

Use this code when documentation confirms a diagnosis of an aneurysmal bone cyst specifically located in the right ankle or foot. Supporting documentation would include imaging reports (X-ray, MRI, CT) demonstrating the characteristic features of an ABC, and often a biopsy confirming the diagnosis.

• Ensure the laterality (right) and specific anatomical site (ankle and foot) are clearly documented.
• Distinguish from other benign bone tumors or cysts; definitive diagnosis often requires histopathology.
• Do not use for aneurysmal bone cysts in other locations; specific codes exist for other anatomical sites.