ICD-10 Code M05.112 – Rheumatoid lung disease with rheumatoid arthritis of left shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.112 – Rheumatoid lung disease with rheumatoid arthritis of left shoulder
What it is
This code identifies rheumatoid arthritis affecting the left shoulder in a patient who also has rheumatoid lung disease. Use it when both conditions are documented as present together.
Clinical signs
Common findings include chronic inflammatory joint pain, stiffness, swelling, and reduced shoulder range of motion. Rheumatoid lung disease may be documented by interstitial lung involvement or other pulmonary manifestations; clinical features vary, refer to documentation.
When to use this code
Use this code when the provider clearly documents rheumatoid lung disease and rheumatoid arthritis involving the left shoulder in the same encounter or problem list. It supports coding of the specific joint site and the extra-articular lung involvement. Check documentation if laterality or pulmonary involvement is unclear.
Do not use for
Do not use it for rheumatoid arthritis of the shoulder without lung disease, or for lung disease not linked to rheumatoid arthritis. Do not assign it when the left side is not specified or when the diagnosis is only suspected.
Coding tip
Confirm both the rheumatoid lung disease and the left-shoulder laterality in the record before assigning M05.112.