Juvenile rheumatoid arthritis w systemic onset, right knee

This code signifies a diagnosis of juvenile idiopathic arthritis (JIA) of the systemic onset subtype, specifically affecting the right knee. Systemic onset JIA is characterized by arthritis accompanied by fever, rash, lymphadenopathy, hepatosplenomegaly, or serositis.

Apply this code when documentation clearly indicates a diagnosis of systemic onset JIA with involvement of the right knee joint. Supporting documentation should detail the systemic features of the disease in addition to the arthritis in the specified joint.

• Ensure the documentation specifies "systemic onset" JIA, not another subtype.
• Verify the laterality of the knee joint (right, left, or bilateral) is clearly stated.
• Do not use this code for other forms of JIA, such as oligoarticular or polyarticular, even if the right knee is affected.