ICD-10 Code M05.19 – Rheumatoid Lung Disease with Rheumatoid Arthritis of Multiple Sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.19 – Rheumatoid lung disease with rheumatoid arthritis of multiple sites
What it is
This code identifies rheumatoid arthritis affecting multiple sites when lung involvement is also documented. Use it for rheumatoid lung disease linked to seropositive rheumatoid arthritis, not for isolated pulmonary disease.
Clinical signs
Findings may include rheumatoid joint disease plus pulmonary manifestations such as interstitial lung disease, pleural disease, or other rheumatoid-related lung involvement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states rheumatoid lung disease and rheumatoid arthritis involving multiple sites. The joint and lung conditions should be documented as related or part of the same rheumatoid disease process. If the site relationship is unclear, check documentation.
Do not use for
Do not use it for rheumatoid arthritis without lung involvement, or for lung disease from another cause. Do not assign it when the chart only mentions suspected pulmonary findings without confirmed rheumatoid linkage.
Coding tip
Confirm both the rheumatoid lung diagnosis and the multiple-site rheumatoid arthritis in the provider note before assigning M05.19.