Myositis ossificans progressiva, left shoulder

This code describes myositis ossificans progressiva (fibrodysplasia ossificans progressiva) affecting the left shoulder. This rare, genetic disorder causes progressive heterotopic ossification of soft tissues, leading to bone formation in muscles, tendons, and ligaments. The condition results in severe functional limitations and immobility.

Use this code when documentation confirms a diagnosis of myositis ossificans progressiva specifically impacting the left shoulder joint or surrounding soft tissues. This diagnosis is typically made based on clinical presentation, genetic testing, and imaging studies showing characteristic heterotopic ossification.

• Ensure documentation clearly specifies "progressiva" to differentiate from myositis ossificans traumatica.
• Laterality is crucial; confirm the left shoulder is the affected site.
• Code any associated functional limitations or complications separately, if applicable.