Juvenile rheumatoid polyarthritis (seronegative)

This code identifies a chronic inflammatory arthritis affecting multiple joints in children, characterized by the absence of rheumatoid factor and anti-citrullinated protein antibodies. It is a subtype of juvenile idiopathic arthritis (JIA) where five or more joints are involved within the first six months of disease onset.

Apply this code for pediatric patients diagnosed with seronegative polyarticular JIA. Documentation should clearly state the polyarticular involvement (five or more joints), the seronegative status (negative rheumatoid factor and anti-CCP antibodies), and the onset before 16 years of age.

• Differentiate from other JIA subtypes based on joint count and serology.
• Ensure the "seronegative" status is explicitly documented; otherwise, consider M08.0 (seropositive).
• Sequence this code as the primary diagnosis when it is the reason for the encounter.