ICD-10 Code M05.139 – Rheumatoid lung disease with rheumatoid arthritis of unspecified wrist (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.139 – Rheumatoid lung disease with rheumatoid arthritis of unspecified wrist
What it is
This code identifies rheumatoid arthritis affecting an unspecified wrist, with associated rheumatoid lung disease. It reflects a documented link between the joint disease and pulmonary involvement.
Clinical signs
Look for rheumatoid arthritis involving the wrist plus evidence of rheumatoid lung disease, such as interstitial lung findings or other pulmonary manifestations documented by the clinician. Clinical features vary; refer to documentation.
When to use this code
Use M05.139 when the record clearly states rheumatoid lung disease and rheumatoid arthritis of an unspecified wrist. Apply it when laterality is not documented and the pulmonary condition is attributed to rheumatoid arthritis.
Do not use for
Do not use this code if the wrist side is specified, because a more specific code may apply. Do not use it when lung disease is unrelated to rheumatoid arthritis or documentation is incomplete; check documentation.
Coding tip
Confirm both the rheumatoid lung disease and the unspecified wrist site are documented before assigning this code.