ICD-10 Code M05.359 – Rheumatoid heart disease with rheumatoid arthritis of unspecified hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.359 – Rheumatoid heart disease with rheumatoid arthritis of unspecified hip
What it is
This code identifies rheumatoid arthritis affecting an unspecified hip, with documented rheumatoid heart disease. Use it when the record links both conditions and does not specify the hip side.
Clinical signs
Clinical features vary; refer to documentation. You may see inflammatory hip pain, stiffness, reduced range of motion, and separate evidence of rheumatoid cardiac involvement noted by the provider.
When to use this code
Use this code when the provider documents rheumatoid heart disease together with rheumatoid arthritis involving a hip, but the hip is not identified as right or left. The diagnosis should be explicitly supported in the note.
If the record names only rheumatoid arthritis or only heart disease, do not assign this code. Check documentation when laterality or the relationship between conditions is unclear.
Do not use for
Do not use it for rheumatoid arthritis of a specified hip, or for heart disease without a documented rheumatoid link. Check documentation if the hip site or cardiac involvement is missing.
Coding tip
Verify both the rheumatoid heart disease diagnosis and unspecified hip laterality before coding.