Myositis ossificans progressiva, right ankle

This code describes the presence of myositis ossificans progressiva, a rare genetic disorder characterized by progressive heterotopic ossification of soft tissues, specifically affecting the right ankle. This condition leads to the formation of bone in muscles, tendons, and ligaments, causing pain, stiffness, and restricted joint movement.

Use this code for patients diagnosed with myositis ossificans progressiva where the right ankle is identified as an affected site. Documentation should clearly state the diagnosis of myositis ossificans progressiva and specify the involvement of the right ankle, often supported by imaging studies demonstrating heterotopic bone formation.

• Ensure documentation explicitly states "myositis ossificans progressiva" to differentiate from myositis ossificans traumatica.
• Verify laterality; separate codes exist for left, bilateral, and unspecified ankle involvement.
• Consider sequencing this code as a primary diagnosis if it is the main reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.