Juvenile arthritis, unspecified, left knee

This code signifies an unspecified form of juvenile arthritis affecting the left knee. Juvenile arthritis encompasses various chronic arthritic conditions with onset before age 16, characterized by persistent joint inflammation. "Unspecified" indicates that the specific type of juvenile arthritis (e.g., oligoarticular, polyarticular, systemic) has not been clinically determined or documented.

Apply this code when documentation confirms a diagnosis of juvenile arthritis localized to the left knee, but the physician has not specified the particular subtype. This is appropriate when the clinical picture is consistent with juvenile arthritis, and further diagnostic workup is pending or the specific classification is not yet established.

• Ensure the documentation explicitly states "juvenile arthritis" and specifies the "left knee."
• Avoid using this code if a more specific type of juvenile arthritis (e.g., M08.062 for juvenile rheumatoid arthritis, left knee) is documented.
• Always review for laterality; this code is specific to the left knee. If the right knee or bilateral involvement is noted, a different code is required.