Oth rheumatoid arthritis w rheumatoid factor of unsp ank/ft

This code signifies a form of rheumatoid arthritis, an autoimmune disease causing chronic inflammation, that affects the ankle and/or foot joints. The "other" classification indicates that the specific type of rheumatoid arthritis is not further detailed, but the presence of rheumatoid factor (RF) is confirmed, and the laterality of the affected ankle/foot is not specified.

Use this code when documentation confirms a diagnosis of rheumatoid arthritis with positive rheumatoid factor, and the affected site is identified as the ankle or foot, but the specific type of RA (e.g., with organ involvement) is not documented. This code is appropriate when the medical record does not specify whether the left, right, or bilateral ankle/foot is involved.

• Ensure documentation explicitly states "rheumatoid factor positive" or similar to support the RF component.
• Avoid using this code if a more specific type of rheumatoid arthritis (e.g., with lung involvement) is documented; instead, choose the appropriate M05.xx code.
• If laterality (left, right, or bilateral) of the ankle/foot is documented, select a more specific code from the M05.87- subcategory.