Other ossification of muscle, unspecified site

This code describes the abnormal formation of bone tissue within a muscle, excluding myositis ossificans traumatica or progressive myositis ossificans. It indicates a non-traumatic, non-progressive ossification of muscle tissue where the specific anatomical location is not documented.

Use this code when the medical record clearly states "other ossification of muscle" and does not specify the affected site. This diagnosis is typically made based on imaging studies (e.g., X-ray, CT scan) showing heterotopic bone formation within muscle tissue, without a history of trauma or a diagnosis of myositis ossificans progressiva.

• Avoid using this code if a specific anatomical site of the ossification is documented; instead, use a more specific M61.5- subcategory.
• Do not use this code for myositis ossificans traumatica (M61.0-) or myositis ossificans progressiva (M61.1-).
• Ensure documentation explicitly states "other" or "unspecified" ossification of muscle to support this code.