Interstitial myositis, right shoulder

This code identifies inflammation of the connective tissue within the muscles of the right shoulder, specifically interstitial myositis. It indicates a non-infectious inflammatory process affecting the muscle fibers and surrounding interstitial tissue in this anatomical region.

Apply this code when documentation specifies interstitial myositis affecting the right shoulder. This diagnosis is typically supported by clinical examination findings of shoulder pain, weakness, and inflammation, often confirmed by imaging studies or muscle biopsy.

• Ensure documentation clearly specifies "interstitial" myositis to differentiate from other forms of myositis.
• Verify the laterality (right shoulder) is explicitly stated in the medical record.
• Do not use this code for infectious myositis; refer to codes in Chapter 13 for those conditions.