ICD-10 Code M05.872 – Other rheumatoid arthritis with rheumatoid factor of left ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.872 – Other rheumatoid arthritis with rheumatoid factor of left ankle and foot
What it is
This code identifies rheumatoid arthritis affecting the left ankle and foot, with a documented rheumatoid factor. Use it when the record specifies this site and does not fit a more specific rheumatoid arthritis category.
Clinical signs
Expect inflammatory joint findings such as pain, swelling, stiffness, and reduced range of motion in the left ankle or foot. Clinical features vary; refer to documentation.
When to use this code
Use M05.872 when the provider documents rheumatoid arthritis with rheumatoid factor involving the left ankle and foot. It is appropriate when the site is clear and the diagnosis is not described as another more specific rheumatoid arthritis type. Check documentation if laterality or joint involvement is unclear.
Do not use for
Do not use this code for rheumatoid arthritis without rheumatoid factor, or for involvement of a different joint or side. If the note does not confirm the left ankle and foot, check documentation.
Coding tip
Confirm both rheumatoid factor status and left-sided ankle/foot involvement before assigning M05.872.