ICD-10 Code M05.122 – Rheumatoid lung disease with rheumatoid arthritis of left elbow (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.122 – Rheumatoid lung disease with rheumatoid arthritis of left elbow
What it is
This code identifies rheumatoid arthritis affecting the left elbow together with rheumatoid lung disease. Use it when both the joint disease and the pulmonary manifestation are documented in the same patient.
Clinical signs
Findings may include chronic inflammatory arthritis of the left elbow plus documented lung involvement related to rheumatoid disease. Clinical features vary; refer to documentation.
When to use this code
Use M05.122 when the record clearly states rheumatoid lung disease and rheumatoid arthritis in the left elbow. The provider should link the lung condition to rheumatoid arthritis or document the combined diagnosis. If the lung involvement is not specified as rheumatoid, check documentation.
Do not use for
Do not use this code for rheumatoid arthritis of the left elbow without lung involvement, or for lung disease not attributed to rheumatoid arthritis. Check documentation if the site or manifestation is unclear.
Coding tip
Confirm both the joint site and the rheumatoid lung manifestation are documented before assigning this combination code.