Other ossification of muscle, unspecified forearm

This code signifies the abnormal formation of bone tissue within the muscle of an unspecified forearm, excluding myositis ossificans traumatica. This condition, also known as heterotopic ossification, results in hardened muscle tissue due to bone deposition, leading to pain and restricted range of motion.

Assign this code when documentation indicates ossification of muscle in the forearm without a specified cause (e.g., trauma, genetic disorder) and the laterality is not specified. Supporting documentation should clearly state "ossification of muscle" or "heterotopic ossification" in the forearm.

• Ensure documentation specifies "unspecified forearm" and does not indicate a traumatic origin to differentiate from myositis ossificans traumatica.
• If the specific forearm (right or left) is documented, a more specific code from the M61.53 subcategory should be used.
• Query the provider for clarification if the cause of ossification or laterality is unclear to allow for more precise coding.