ICD-10 Code M05.159 – Rheumatoid lung disease with rheumatoid arthritis of unspecified hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.159 – Rheumatoid lung disease with rheumatoid arthritis of unspecified hip
What it is
This code identifies rheumatoid arthritis affecting an unspecified hip, with associated rheumatoid lung disease. Use it when the record links the hip arthritis and lung involvement to the same rheumatoid condition.
Clinical signs
Documentation may note hip pain, stiffness, reduced range of motion, and respiratory findings tied to rheumatoid lung disease. Clinical features vary; refer to documentation.
When to use this code
Use M05.159 when the provider documents rheumatoid arthritis in an unspecified hip and confirms rheumatoid lung disease as part of the same diagnosis. The hip laterality is not specified in the record.
Code from the provider’s wording, especially when pulmonary involvement is explicitly attributed to rheumatoid disease. If the lung condition is not linked to rheumatoid arthritis, check documentation.
Do not use for
Do not use this code if the hip side is documented, because a more specific code may apply. Do not assign it for lung disease without a documented rheumatoid connection.
Coding tip
Verify both the rheumatoid lung disease and the unspecified hip documentation before coding; if either element is unclear, check documentation.