Myositis ossificans progressiva, left forearm

This code represents a rare, progressive genetic disorder characterized by the abnormal formation of bone in muscles, tendons, ligaments, and other connective tissues of the left forearm. This ossification leads to stiffness, pain, and severely restricted movement in the affected limb.

Use this code when documentation explicitly states a diagnosis of myositis ossificans progressiva affecting the left forearm. This diagnosis is typically confirmed through clinical examination, imaging studies (e.g., X-rays, CT scans), and genetic testing.

• Ensure the documentation specifies "progressiva" to differentiate from localized myositis ossificans.
• Verify the laterality is clearly documented as "left forearm."
• Do not confuse with M61.0- (Myositis ossificans traumatica) or M61.2- (Myositis ossificans associated with paralysis and neuromuscular disease).