Rheumatoid myopathy w rheumatoid arthritis of unsp shoulder

This diagnosis code signifies a muscle disorder directly associated with rheumatoid arthritis, specifically affecting an unspecified shoulder. It indicates the presence of myopathy (muscle disease) as a manifestation of the underlying autoimmune inflammatory process of rheumatoid arthritis.

Apply this code when documentation explicitly states rheumatoid myopathy in a patient with rheumatoid arthritis, and the affected shoulder is not specified. This typically occurs when a clinician notes muscle weakness, pain, or atrophy in the shoulder region, attributing it to the patient's systemic rheumatoid disease.

• Ensure documentation clearly links the myopathy to rheumatoid arthritis.
• Avoid using this code if a more specific shoulder (right or left) is documented; instead, use M05.411 or M05.412.
• Always sequence the underlying rheumatoid arthritis code (e.g., from category M05.-) as the primary diagnosis if it is the reason for the encounter.