ICD-10 Code M05.37 – Rheumatoid heart disease with rheumatoid arthritis of ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.37 – Rheumatoid heart disease with rheumatoid arthritis of ankle and foot
What it is
This code identifies rheumatoid arthritis affecting the ankle and foot in a patient who also has rheumatoid heart disease. Use it when the record links both the joint disease and the cardiac manifestation.
Clinical signs
Findings may include inflammatory pain, swelling, stiffness, and reduced motion in the ankle or foot. Clinical features vary; refer to documentation for evidence of rheumatoid heart disease and the involved joints.
When to use this code
Use this code when the provider documents rheumatoid arthritis of the ankle and foot together with rheumatoid heart disease. It is appropriate when the relationship is clearly stated or implied in the note. Check documentation if the heart disease is not specified as rheumatoid.
Do not use for
Do not use it for rheumatoid arthritis without cardiac involvement, or for isolated foot or ankle pain without documented rheumatoid arthritis. Avoid this code if another type of heart disease is documented instead.
Coding tip
Confirm that both the joint site and the rheumatoid heart disease are documented before assigning M05.37.