Rheumatoid arthritis w/o rheumatoid factor, unsp ank/ft

This code signifies a chronic inflammatory autoimmune disease primarily affecting the synovial lining of joints, specifically in an unspecified ankle and foot, where the characteristic rheumatoid factor antibody is absent. It indicates a seronegative form of rheumatoid arthritis impacting the lower extremity.

Apply this code when documentation confirms a diagnosis of seronegative rheumatoid arthritis with involvement of the ankle and/or foot, but the specific laterality (right or left) is not documented. Use when the provider explicitly states "rheumatoid arthritis without rheumatoid factor" or "seronegative rheumatoid arthritis" affecting the ankle and foot.

• Ensure documentation clearly states the absence of rheumatoid factor.
• Avoid using this code if laterality (right or left ankle/foot) is specified; instead, use the more specific codes.
• Do not confuse with other inflammatory arthropathies or seropositive rheumatoid arthritis.