Juvenile rheumatoid arthritis with systemic onset, left knee

This code signifies a chronic inflammatory arthritic condition affecting the left knee in a pediatric patient, characterized by systemic features such as fever, rash, and lymphadenopathy, in addition to joint involvement. It represents a specific subtype of juvenile idiopathic arthritis (JIA) where systemic symptoms precede or accompany the onset of arthritis.

Apply this code when documentation clearly indicates a diagnosis of juvenile rheumatoid arthritis with systemic onset, specifically affecting the left knee. Supporting clinical notes should detail systemic manifestations alongside arthritic findings in the specified joint. This code is appropriate for initial diagnoses and subsequent encounters related to this specific condition and joint.

• Ensure documentation explicitly states "systemic onset" to differentiate from other JIA subtypes.
• Verify the affected joint is precisely identified as the "left knee"; laterality is crucial.
• Consider sequencing this code with codes for any associated systemic manifestations if they are active and being treated.