Reiter's disease

This code represents Reiter's disease, also known as reactive arthritis, which is an autoimmune condition triggered by an infection, typically gastrointestinal or genitourinary. It is characterized by a classic triad of symptoms: arthritis, urethritis, and conjunctivitis, though not all three may be present. The inflammation can affect joints, eyes, and the genitourinary tract.

Use this code for documented cases of reactive arthritis, particularly when the physician explicitly diagnoses "Reiter's disease" or "reactive arthritis." Documentation should clearly indicate the presence of inflammatory arthritis following an infection, even if the causative organism is not identified. This code is appropriate for both acute and chronic presentations of the condition.

• Ensure documentation specifies "Reiter's disease" or "reactive arthritis" to differentiate from other forms of inflammatory arthritis.
• Code any underlying or causative infection separately if identified and documented.
• Do not confuse with other seronegative spondyloarthropathies unless specifically diagnosed as Reiter's.