Myositis ossificans progressiva, right lower leg

This code signifies a rare, progressive genetic disorder characterized by the formation of bone in muscles, tendons, ligaments, and other connective tissues, specifically affecting the right lower leg. This heterotopic ossification leads to significant pain, swelling, and progressive loss of joint mobility in the affected limb.

Use this code when documentation clearly indicates a diagnosis of myositis ossificans progressiva (also known as fibrodysplasia ossificans progressiva) with specific involvement of the right lower leg. This diagnosis is typically confirmed through clinical presentation, imaging studies (X-rays, CT scans), and genetic testing.

• Ensure laterality is precisely documented; this code is specific to the right lower leg.
• Distinguish from myositis ossificans traumatica (M61.0-), which is typically localized and follows trauma.
• Consider sequencing with codes for associated symptoms or complications, such as pain or functional impairment.