Other ossification of muscle, multiple sites

This code signifies the pathological formation of bone tissue within muscle at multiple, non-contiguous anatomical locations. This condition, often referred to as myositis ossificans, involves the abnormal deposition of calcium and other bone-forming minerals in soft tissue where bone does not normally exist.

Apply this code when documentation confirms the presence of heterotopic ossification affecting more than one muscle group or site. This typically arises from trauma, surgical procedures, or genetic predispositions, and is supported by imaging studies (e.g., X-ray, CT scan) and clinical findings.

• Ensure documentation specifies "multiple sites" to differentiate from single-site ossification.
• Distinguish from calcification of muscle (M61.4-) which involves calcium deposits without true bone formation.
• Code any underlying cause or associated injury separately, following sequencing guidelines.