Other cyst of bone, right ankle and foot

This code signifies the presence of a non-neoplastic, fluid-filled or semi-solid sac within the bone structure of the right ankle or foot. These cysts are typically benign and can be asymptomatic or cause localized pain, swelling, or pathological fractures.

Use this code when documentation specifies a bone cyst in the right ankle or foot that is not further classified as an aneurysmal bone cyst, simple bone cyst, or other specific type. This code is appropriate when imaging studies (e.g., X-ray, MRI) confirm the presence of such a lesion and the laterality is clearly documented.

• Ensure documentation specifies "right" ankle and foot; otherwise, an unspecified laterality code or left-sided code would be more appropriate.
• Distinguish from specific types of bone cysts (e.g., M85.4- for solitary bone cyst) if the documentation provides further detail.
• Code any associated symptoms (e.g., pain, swelling) or complications (e.g., pathological fracture) in addition to this diagnosis.