Myositis ossificans traumatica, other site

This code represents the formation of heterotopic bone within muscle tissue following a traumatic injury, specifically occurring in an anatomical location other than the thigh or arm. This condition involves the abnormal growth of bone in soft tissues, often presenting as a firm, painful mass.

Use this code when documentation clearly indicates myositis ossificans developed after trauma in sites such as the forearm, calf, or trunk. Supporting documentation should include a history of trauma to the affected area and imaging studies (e.g., X-ray, MRI) confirming heterotopic ossification within the muscle.

• Ensure the documentation specifies a traumatic etiology; differentiate from non-traumatic myositis ossificans.
• Verify the anatomical site is "other" and not specifically the thigh (M61.05-) or arm (M61.02-).
• Code any underlying fracture or primary injury separately, if applicable, following sequencing guidelines.