Monoarthritis, not elsewhere classified, right knee

This code signifies inflammation affecting a single joint, specifically the right knee, that is not attributable to another specified condition. It indicates a localized inflammatory process within the right knee joint without a definitive underlying systemic cause or specific arthropathy.

Apply this code when documentation clearly states monoarthritis of the right knee and further specifies that the etiology is not otherwise classified. This is appropriate for cases where diagnostic workup has ruled out specific forms of arthritis (e.g., rheumatoid, psoriatic, infectious) or when the cause remains undetermined.

• Ensure documentation explicitly states "right knee" and "monoarthritis."
• Do not use if a more specific diagnosis for the monoarthritis is identified (e.g., gouty arthritis, infectious arthritis).
• Consider sequencing this code after any underlying systemic conditions if they are present and contributing to the monoarthritis.