Reiter's disease, right ankle and foot

This code describes reactive arthritis (formerly Reiter's syndrome) affecting the right ankle and foot. Reactive arthritis is an autoimmune condition triggered by an infection elsewhere in the body, leading to inflammation of joints, eyes, and genitourinary tract.

Use this code when documentation specifies a diagnosis of Reiter's disease with involvement of the right ankle and/or foot. Supporting documentation should include physician notes detailing the diagnosis, affected joint(s), and laterality.

• Ensure documentation clearly specifies "Reiter's disease" or "reactive arthritis" and the right ankle/foot involvement.
• Do not confuse with other forms of inflammatory arthropathy or unspecified arthritis.
• Code any underlying infection separately, if known and active.