Other cyst of bone, unspecified hand

This code describes a non-neoplastic, fluid-filled or semi-solid lesion within the bone structure of an unspecified hand, excluding specific types like aneurysmal bone cysts or solitary bone cysts. It represents a general category for other benign bone cysts in this anatomical location when the precise type is not documented.

Use this code when documentation indicates the presence of an "other cyst of bone" in the hand, and the specific hand (right or left) is not specified. This code is appropriate when imaging reports (e.g., X-ray, MRI) identify a benign bone cyst in the hand, but further pathological or definitive diagnostic information is lacking to classify it more precisely.

• Ensure the documentation clearly states "unspecified hand" if laterality is not determined.
• Avoid using this code if a more specific type of bone cyst (e.g., aneurysmal, solitary) is identified; use the appropriate specific code instead.
• If the laterality is known, use the more specific codes for right (M85.641) or left (M85.642) hand.