Calcifcn and ossifictn of muscles assoc w burns, unsp shldr

This code describes the pathological hardening of muscle tissue in the shoulder region due to the deposition of calcium and bone-like material, specifically occurring as a complication of a burn injury. This process, known as myositis ossificans, leads to restricted movement and pain in the affected shoulder.

Use this code when documentation clearly indicates the presence of calcification or ossification within the shoulder muscles, and the etiology is directly linked to a prior burn injury. This diagnosis is typically supported by imaging studies (e.g., X-ray, CT scan) showing heterotopic bone formation within the muscle.

• Ensure the documentation explicitly links the myositis ossificans to a burn injury, not other causes like trauma or genetic predisposition.
• Specify the laterality of the shoulder if known (e.g., right, left) using more specific codes within the M61.31 subcategory.
• Code the underlying burn injury (T20-T32) as an additional diagnosis, if still active or relevant to the current encounter.