Myositis ossificans traumatica, unspecified lower leg

This code describes the formation of heterotopic bone within muscle tissue of an unspecified lower leg, specifically resulting from trauma. This condition, known as myositis ossificans traumatica, involves the abnormal growth of bone in soft tissues where bone does not normally exist, typically following an injury.

Use this code when documentation confirms myositis ossificans in the lower leg (e.g., calf, shin) and explicitly links its etiology to a traumatic event. This code is appropriate when the specific lower leg (right or left) is not documented. Supporting documentation should include imaging reports (X-ray, CT) confirming heterotopic ossification and clinical notes detailing the traumatic injury.

• Ensure documentation clearly states the traumatic origin; otherwise, consider M61.1- (myositis ossificans progressiva) or M61.2- (myositis ossificans associated with paralysis).
• Avoid using this code if the laterality (right or left lower leg) is specified; instead, use M61.061 for right or M61.062 for left.
• Code any associated acute traumatic injury separately, if still present and being treated.