ICD-10 Code M05.369 – Rheumatoid heart disease with rheumatoid arthritis of unspecified knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.369 – Rheumatoid heart disease with rheumatoid arthritis of unspecified knee
What it is
This code identifies rheumatoid arthritis affecting an unspecified knee, with associated rheumatoid heart disease. Use it when the record links the joint disease and cardiac involvement, but does not specify which knee.
Clinical signs
Documentation may show inflammatory knee arthritis with pain, swelling, stiffness, or limited motion, plus evidence of rheumatoid cardiac involvement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid heart disease and rheumatoid arthritis in an unspecified knee during the same encounter. It is appropriate when laterality is not stated or cannot be confirmed from the record. Check documentation if the heart disease is not clearly tied to rheumatoid arthritis.
Do not use for
Do not use it for rheumatoid arthritis of a specified knee side, or for isolated heart disease without documented rheumatoid linkage. Do not assign it when the knee diagnosis is missing or the record is unclear.
Coding tip
Verify both the cardiac and joint documentation, and query for laterality if the knee is not specified.