Rheumatoid myopathy w rheumatoid arthritis of multiple sites

This code signifies a muscular disorder (myopathy) directly caused by or associated with rheumatoid arthritis, affecting multiple anatomical locations. It indicates that the patient's rheumatoid arthritis has manifested with muscle involvement across various body sites.

Apply this code when documentation explicitly states "rheumatoid myopathy" in the context of a patient diagnosed with rheumatoid arthritis, and the myopathic symptoms are present in more than one joint or body region. Supporting documentation should detail the muscular involvement and its connection to the underlying autoimmune condition.

• Ensure the documentation clearly links the myopathy to rheumatoid arthritis and specifies involvement of "multiple sites."
• Do not use this code for general muscle pain or weakness in rheumatoid arthritis without a definitive diagnosis of myopathy.
• Sequence this code after the primary rheumatoid arthritis code (e.g., M05.xx or M06.xx) if the myopathy is a manifestation of the RA.