ICD-10 Code M05.142 – Rheumatoid lung disease with rheumatoid arthritis of left hand (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.142 – Rheumatoid lung disease with rheumatoid arthritis of left hand
What it is
This code identifies rheumatoid arthritis affecting the left hand, with rheumatoid lung disease documented as part of the same condition. Use it when the record links both the joint disease and pulmonary involvement to rheumatoid arthritis.
Clinical signs
Findings may include inflammatory arthritis in the left hand, such as pain, swelling, stiffness, or deformity, along with documented rheumatoid lung involvement. Clinical features vary; refer to documentation.
When to use this code
Use M05.142 when the provider states rheumatoid arthritis of the left hand and also documents rheumatoid lung disease. The diagnosis should clearly connect the lung disease to rheumatoid arthritis, not another pulmonary disorder. If the hand laterality or pulmonary relationship is unclear, check documentation.
Do not use for
Do not use this code for rheumatoid arthritis without lung involvement, or for lung disease not linked to rheumatoid arthritis. Do not assign it if the affected hand is not the left hand.
Coding tip
Confirm both the laterality and the rheumatoid lung disease relationship in the provider note before assigning this code.