Reiter's disease, unspecified hand

This diagnosis code identifies Reiter's disease, also known as reactive arthritis, specifically affecting an unspecified hand. Reiter's disease is an autoimmune condition triggered by an infection, characterized by a triad of arthritis, urethritis, and conjunctivitis, though not all symptoms may be present. This code indicates the inflammatory arthritis component is localized to the hand, without further specification of laterality.

Use this code when documentation confirms a diagnosis of Reiter's disease with arthritic involvement of the hand, but the medical record does not specify whether it affects the right or left hand. This code is appropriate when the provider explicitly states "Reiter's disease of hand, unspecified" or similar phrasing.

• Do not use this code if the documentation specifies laterality (e.g., right hand, left hand); instead, select a more specific code from the M02.34- subcategory.
• Ensure the medical record clearly links the hand arthritis to a diagnosis of Reiter's disease.
• Consider sequencing this code after a code for the underlying infection, if known and still active, as reactive arthritis is typically a post-infectious sequela.