Other cyst of bone, right hand

This code signifies the presence of a non-neoplastic, fluid-filled or semi-solid sac within the bone structure of the patient's right hand. These cysts are typically benign and can be asymptomatic or cause localized pain, swelling, or pathological fractures. They are distinct from bone tumors or infectious processes.

Use this code when documentation clearly identifies a benign bone cyst located specifically in the right hand, and the cyst is not further specified as an aneurysmal bone cyst (M85.5-) or solitary bone cyst (M85.4-). This code is appropriate for findings from imaging studies (X-ray, MRI) or biopsy results confirming a bone cyst.

• Ensure laterality is precisely documented (right hand). If the left hand is affected, a different code (M85.642) is required.
• Distinguish "other cyst of bone" from more specific types of bone cysts, such as aneurysmal bone cysts (M85.5-) or solitary bone cysts (M85.4-), which have their own dedicated codes.
• Do not use this code for soft tissue cysts of the hand; those would fall under different categories (e.g., M71.3- for other synovial cysts).