Reiter's disease, left ankle and foot

This code signifies an inflammatory arthropathy affecting the left ankle and foot, specifically attributed to Reiter's disease (now more commonly referred to as reactive arthritis). This condition typically develops in response to an infection elsewhere in the body, presenting with joint pain, swelling, and stiffness.

Use this code when documentation clearly indicates a diagnosis of Reiter's disease with inflammatory involvement of the left ankle and/or foot. This diagnosis is often supported by a history of recent infection (e.g., gastrointestinal or genitourinary), along with clinical findings of arthritis in the specified joint.

• Ensure the documentation specifies "left" ankle and foot; laterality is crucial for accurate coding.
• Do not confuse with other forms of inflammatory arthritis without a clear link to a preceding infection.
• Consider coding the underlying infection, if known and still active, as a secondary diagnosis.