Other calcification of muscle, unspecified thigh

This code signifies the presence of abnormal calcium deposits within the muscle tissue of an unspecified thigh, not otherwise classified as myositis ossificans traumatica or progressive. These calcifications can lead to pain, stiffness, and impaired muscle function. It represents a non-specific finding of muscle calcification.

Apply this code when documentation indicates calcification of a thigh muscle without a clear traumatic etiology or a diagnosis of myositis ossificans progressiva. This code is appropriate when the specific thigh (right or left) is not documented. Supporting documentation would include imaging reports (e.g., X-ray, CT scan) describing muscle calcification and physician notes confirming the location and lack of a more specific diagnosis.

• Ensure the documentation specifies "unspecified thigh" or does not indicate laterality. If laterality is known, a more specific code (M61.451 or M61.452) should be used.
• Differentiate from myositis ossificans traumatica (M61.0-) or myositis ossificans progressiva (M61.1-). This code is for other, non-traumatic, non-progressive calcifications.
• Code any underlying cause or associated symptoms (e.g., pain, muscle weakness) separately, if documented.