Pauciarticular juvenile rheumatoid arthritis, left knee

This diagnosis code identifies a chronic autoimmune inflammatory condition affecting the left knee joint in children. It is characterized by arthritis in four or fewer joints, with the left knee being the specific site of involvement. This form of juvenile idiopathic arthritis typically presents before 16 years of age.

Use this code when documentation explicitly states a diagnosis of pauciarticular juvenile rheumatoid arthritis (or juvenile idiopathic arthritis) affecting only the left knee. This diagnosis is typically made by a rheumatologist or pediatrician based on clinical examination, imaging, and laboratory findings. Ensure the laterality of the affected joint is clearly specified as left.

• Verify the specific type of juvenile idiopathic arthritis (JIA) and the number of joints involved. "Pauciarticular" indicates four or fewer joints.
• Always confirm laterality. If documentation states bilateral knee involvement, a different code would be appropriate.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, especially for treatment or management of the arthritis.