Interstitial myositis, unspecified hand

This code signifies inflammation of the connective tissue within the muscles of an unspecified hand, without evidence of infection or other specific causes. It represents a non-infectious inflammatory process affecting the muscle fibers and surrounding interstitial tissue.

Use this code when documentation indicates interstitial myositis affecting the hand, but the specific laterality (right or left) is not documented. This diagnosis is typically supported by clinical findings such as localized hand pain, swelling, tenderness, and possibly weakness, in the absence of trauma or infection.

• Ensure documentation clearly states "interstitial myositis" and specifies the hand as the affected site.
• Avoid using this code if laterality (right or left hand) is specified; instead, use the more specific M60.141 or M60.142.
• Differentiate from other forms of myositis (e.g., infectious, toxic) which have distinct codes.