Myositis ossificans progressiva, left upper arm

This code signifies a rare, progressive genetic disorder characterized by the abnormal formation of bone in muscles, tendons, and ligaments, specifically affecting the left upper arm. This heterotopic ossification leads to chronic pain, swelling, and progressive loss of mobility in the affected limb.

Apply this code when documentation confirms a diagnosis of myositis ossificans progressiva with clear involvement of the patient's left upper arm. Supporting documentation should include genetic testing results, imaging studies (e.g., X-rays, CT scans) demonstrating heterotopic bone formation, and clinical notes detailing the progressive nature of the condition and its impact on the left upper extremity.

• Ensure the documentation explicitly states "progressiva" to differentiate from myositis ossificans traumatica.
• Verify laterality; this code is specific to the left upper arm.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, especially for management of the condition.