Rheu lung disease w rheumatoid arthritis of right ank/ft

This code signifies a systemic autoimmune condition where a patient has rheumatoid arthritis (RA) affecting the right ankle and foot, concurrently presenting with lung involvement directly attributable to the RA. The lung disease can manifest in various forms, such as nodules, interstitial lung disease, or pleurisy.

Use this code when documentation clearly states a diagnosis of rheumatoid arthritis with specific involvement of the right ankle and foot, and also identifies a rheumatoid lung disease. Supporting documentation should include physician notes detailing both the RA diagnosis with joint specificity and the pulmonary findings linked to the RA.

• Ensure the documentation explicitly links the lung disease to rheumatoid arthritis, not a separate pulmonary condition.
• Verify laterality for the ankle and foot involvement (right in this case).
• Code any specific manifestations of the rheumatoid lung disease (e.g., J99.1 for rheumatoid lung disease with interstitial lung disease) as a secondary diagnosis, if specified.