Paralytic calcifcn and ossifictn of muscle, unsp lower leg

This code describes the abnormal hardening of muscle tissue in an unspecified lower leg due to calcium deposits (calcification) and bone formation (ossification), occurring as a consequence of paralysis. This condition, often referred to as myositis ossificans traumatica or heterotopic ossification, results in restricted muscle function and pain.

Use this code when documentation specifies paralytic calcification and ossification affecting the musculature of the lower leg, without further specification of laterality. This diagnosis is typically supported by imaging studies (e.g., X-ray, CT scan) demonstrating the heterotopic bone formation within the muscle, alongside a history of paralysis.

• Ensure documentation clearly links the calcification/ossification to a paralytic etiology.
• Avoid using this code if the laterality (right or left lower leg) is specified; use the more specific codes M61.261 or M61.262.
• Consider sequencing this code after the underlying condition causing the paralysis, if applicable and still active.