ICD-10 Code M05.162 – Rheumatoid Lung Disease with Rheumatoid Arthritis of Left Knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.162 – Rheumatoid lung disease with rheumatoid arthritis of left knee
What it is
This code identifies rheumatoid arthritis affecting the left knee, with associated rheumatoid lung disease. Use it when both the joint involvement and lung manifestation are documented together.
Clinical signs
Findings may include left knee pain, swelling, stiffness, or reduced range of motion, along with documented rheumatoid lung disease. Clinical features vary; refer to documentation.
When to use this code
Use M05.162 when the provider clearly documents rheumatoid arthritis of the left knee and rheumatoid lung disease in the same patient. The record should support both the joint site and the pulmonary manifestation. If the lung condition is not specified as rheumatoid, check documentation.
Do not use for
Do not use this code for rheumatoid arthritis without lung involvement, or for lung disease unrelated to rheumatoid arthritis. Do not assign it if the left knee is not documented as the affected site.
Coding tip
Confirm both the rheumatoid lung disease and the left-knee laterality before coding.