Rheumatoid myopathy w rheumatoid arthritis of right ank/ft

This code signifies a muscular disorder (myopathy) directly caused by rheumatoid arthritis, specifically affecting the right ankle and foot. It indicates a systemic autoimmune condition with a localized muscular manifestation in the lower extremity.

Apply this code when documentation clearly states rheumatoid myopathy in a patient diagnosed with rheumatoid arthritis, with the specific anatomical involvement of the right ankle and foot. Supporting documentation would include physician notes detailing muscle weakness, pain, or atrophy in the specified area, linked to the patient's RA.

• Ensure documentation explicitly links the myopathy to rheumatoid arthritis and specifies the right ankle and foot.
• Do not use this code for general muscle pain or weakness in RA patients without a definitive diagnosis of rheumatoid myopathy.
• Sequence this code after the primary rheumatoid arthritis code (e.g., M05.xx) if the myopathy is considered a manifestation or complication.