Rheumatoid myopathy w rheumatoid arthritis of left shoulder

This diagnosis code signifies a muscle disorder (myopathy) directly caused by rheumatoid arthritis, specifically affecting the left shoulder. It indicates that the patient's rheumatoid arthritis has manifested with muscular involvement in this particular joint.

Apply this code when documentation clearly states rheumatoid myopathy associated with rheumatoid arthritis, with the left shoulder identified as the affected site. Supporting documentation would include physician notes detailing muscle weakness, pain, or functional impairment in the left shoulder attributed to the patient's underlying rheumatoid arthritis.

• Ensure the documentation explicitly links the myopathy to rheumatoid arthritis and specifies the left shoulder.
• Do not use this code for general muscle pain or weakness in a rheumatoid arthritis patient if a direct causal link to rheumatoid myopathy is not established.
• Always sequence this code after the primary rheumatoid arthritis diagnosis (e.g., M05.xx or M06.xx) to demonstrate the causal relationship.