Monoarthritis, not elsewhere classified, left hand

This code signifies inflammation affecting a single joint in the left hand, where the underlying cause is not specified or classifiable under other more specific arthritis codes. It indicates a localized inflammatory process within one of the left hand's joints, such as a metacarpophalangeal or interphalangeal joint.

Apply this code when documentation clearly states monoarthritis of the left hand without a definitive etiology (e.g., not rheumatoid, psoriatic, or gouty arthritis). This is appropriate for cases where diagnostic workup is incomplete or inconclusive regarding the specific type of arthritis. Supporting documentation would include physician notes detailing a single inflamed joint in the left hand and the absence of other specific arthritis diagnoses.

• Ensure documentation specifies "monoarthritis" and clearly identifies the "left hand" as the affected site.
• Do not use if a more specific type of arthritis (e.g., rheumatoid, psoriatic, gout) is diagnosed, even if it presents as monoarthritis.
• Consider sequencing this code after any underlying systemic condition if known and contributing to the monoarthritis, but not specifically classified elsewhere.