Myositis ossificans progressiva, unspecified hand

This code signifies a rare, progressive genetic disorder characterized by the abnormal formation of bone in muscles, tendons, and ligaments, specifically affecting an unspecified hand. This heterotopic ossification leads to chronic pain, stiffness, and progressive loss of joint mobility in the affected area.

Apply this code when documentation confirms a diagnosis of myositis ossificans progressiva with involvement of the hand, but the specific laterality (right or left) is not specified. This diagnosis is typically supported by clinical examination, imaging studies (e.g., X-rays, CT scans showing heterotopic bone formation), and genetic testing.

• Ensure documentation clearly states "unspecified hand" or lacks laterality for the hand involvement.
• Distinguish from localized myositis ossificans (traumatic or non-progressive), which has different coding.
• Consider sequencing with codes for associated symptoms or complications, such as pain or functional impairment.