Rheu arthritis of right knee w involv of organs and systems

This code signifies rheumatoid arthritis affecting the right knee, where the disease has progressed to involve other body systems beyond the joints. This systemic involvement can manifest as vasculitis, lung disease, cardiac complications, or other extra-articular manifestations directly attributable to the rheumatoid arthritis.

Apply this code when documentation clearly indicates a diagnosis of rheumatoid arthritis with specific mention of involvement of the right knee and evidence of systemic complications. This code is appropriate when the physician explicitly links the extra-articular manifestations to the underlying rheumatoid arthritis.

• Ensure documentation specifies "right knee" and clearly identifies the "other organs and systems" involved.
• Do not use this code if the systemic involvement is due to a co-morbid condition unrelated to the rheumatoid arthritis.
• Sequence this code as the primary diagnosis when the systemic involvement is the focus of the encounter, or as a secondary diagnosis when the joint involvement is the primary reason.