Myositis ossificans traumatica, left lower leg

This code describes the development of heterotopic bone formation within muscle tissue of the left lower leg, specifically resulting from a traumatic injury. This condition involves the abnormal growth of bone in soft tissues where bone does not normally exist, often following a contusion, strain, or fracture.

Use this code when documentation clearly indicates myositis ossificans in the left lower leg and explicitly links its etiology to a traumatic event. Supporting documentation should include imaging reports (e.g., X-ray, MRI) confirming the presence of ossification and clinical notes detailing the history of trauma to the affected area.

• Ensure the documentation specifies "traumatica" as the cause; otherwise, consider M61.1- for progressive myositis ossificans.
• Verify laterality (left lower leg) is clearly documented.
• Do not confuse with calcification of soft tissue (M61.4-) unless the documentation explicitly states ossification.