Other cyst of bone, right forearm

This code signifies the presence of a non-neoplastic, fluid-filled or semi-solid sac within the bone of the right forearm, excluding specific types of cysts like aneurysmal or solitary bone cysts. These lesions are typically benign and may be discovered incidentally or due to localized pain or swelling.

Apply this code when documentation specifies an "other" type of bone cyst located in the right forearm, and more specific cyst codes (e.g., M85.4- for solitary bone cyst) are not applicable. Supporting documentation should clearly indicate the location and the non-specific nature of the cyst.

• Ensure the documentation explicitly states "right forearm" to justify the laterality and anatomical site.
• Distinguish "other cyst of bone" from more specific bone cyst diagnoses; if a more precise diagnosis is available (e.g., aneurysmal bone cyst), use the corresponding code.
• Code any associated symptoms or complications (e.g., pain, pathological fracture) separately, following sequencing guidelines.