Rheumatoid lung disease w rheumatoid arthritis of right knee

This code signifies a systemic autoimmune disorder characterized by rheumatoid arthritis (RA) affecting the right knee, concurrently presenting with lung involvement directly attributable to the rheumatoid disease process. The lung manifestations can vary, including interstitial lung disease, pleural effusions, or rheumatoid nodules within the lung tissue.

Apply this code when documentation clearly indicates a diagnosis of rheumatoid arthritis with specific involvement of the right knee joint, alongside a confirmed diagnosis of rheumatoid lung disease. Supporting documentation should include physician notes detailing both the joint and pulmonary manifestations, often supported by imaging (e.g., X-ray, CT scan) and pulmonary function tests.

• Ensure documentation explicitly links the lung disease to the rheumatoid arthritis, rather than a separate pulmonary condition.
• Do not use this code if the lung disease is due to medication side effects for RA; instead, code the specific lung condition and an adverse effect code.
• Always sequence this code after the primary rheumatoid arthritis code if the lung disease is considered a manifestation or complication.