ICD-10 Code M05.17 – Rheumatoid lung disease with rheumatoid arthritis of ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.17 – Rheumatoid lung disease with rheumatoid arthritis of ankle and foot
What it is
This code identifies rheumatoid arthritis affecting the ankle and foot, along with rheumatoid lung disease. Use it when both joint disease and pulmonary involvement are documented in the same patient.
Clinical signs
Findings may include inflammatory ankle or foot pain, swelling, stiffness, and reduced function, plus documented lung involvement such as interstitial or pleural disease. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly links rheumatoid arthritis of the ankle and foot with rheumatoid lung disease. It fits outpatient, inpatient, or problem-list documentation that supports both conditions. Check documentation if the lung manifestation or joint site is not specified.
Do not use for
Do not use it if rheumatoid lung disease is documented without ankle or foot involvement, or if the arthritis site is different. Do not assign it when the pulmonary condition is unrelated to rheumatoid disease.
Coding tip
Confirm that the provider documents both the rheumatoid lung disease and the ankle/foot joint involvement before assigning M05.17.