Rheumatoid myopathy with rheumatoid arthritis of right knee

This code signifies a specific manifestation of rheumatoid arthritis (RA) affecting the muscles, known as rheumatoid myopathy, specifically impacting the right knee joint. It indicates that the muscle weakness or inflammation is directly attributable to the underlying systemic RA, rather than other causes of myopathy.

Apply this code when documentation clearly states a diagnosis of rheumatoid myopathy in a patient with rheumatoid arthritis, with the right knee identified as the affected joint. Supporting documentation should include physician notes detailing the myopathy and its association with RA, along with the specific joint involvement.

• Ensure documentation explicitly links the myopathy to rheumatoid arthritis and specifies the right knee.
• Do not use this code for general rheumatoid arthritis of the knee without documented myopathy.
• Consider sequencing this code after the primary rheumatoid arthritis code if the myopathy is a manifestation.