Solitary bone cyst, right ankle and foot

This code identifies a benign, fluid-filled lesion within the bone of the right ankle or foot, characterized by a single, well-defined cavity. These cysts are typically asymptomatic and discovered incidentally, though they can cause pain or pathological fracture in some cases.

Assign this code for documented solitary bone cysts affecting any bone within the right ankle or foot region. Documentation should clearly specify the lesion as a "solitary bone cyst" or "unicameral bone cyst" and confirm its location in the right ankle or foot.

• Ensure laterality is explicitly documented as "right" for the ankle or foot.
• Distinguish from aneurysmal bone cysts (M85.5-) or other specified bone cysts (M85.6-).
• Code any associated pathological fracture separately, if applicable.