Monoarthritis, NEC, right ankle and foot

This code signifies inflammation affecting a single joint in the right ankle or foot, which is not attributable to a specific, separately classified arthritic condition. It indicates a localized inflammatory process within one joint of the specified anatomical region.

Apply this code when documentation clearly states monoarthritis of the right ankle or foot, and no other specific cause (e.g., gout, rheumatoid arthritis, infectious arthritis) has been identified or is being coded separately. This is appropriate for cases where the etiology is unknown or not yet fully investigated.

• Ensure documentation specifies "monoarthritis" and clearly identifies the right ankle or foot as the affected site.
• Do not use this code if a more specific type of arthritis (e.g., M10.071 for gouty arthritis, right ankle and foot) is documented.
• Always review the entire medical record to confirm that the monoarthritis is not a manifestation of a systemic disease or a sequela of trauma.