Reiter's disease, unspecified site

This code represents Reiter's disease, also known as reactive arthritis, which is a form of inflammatory arthritis that develops in response to an infection elsewhere in the body. It typically presents with a triad of symptoms: arthritis, urethritis, and conjunctivitis, though not all three may be present. This specific code is used when the affected anatomical site is not specified in the medical record.

Use this code when the physician's documentation clearly states a diagnosis of Reiter's disease or reactive arthritis, but does not specify which joint or body region is primarily affected. This code is appropriate when the clinical picture aligns with reactive arthritis following an infection, such as gastrointestinal or genitourinary. Documentation should support the diagnosis of Reiter's disease without a more specific site.

• Avoid using this code if a more specific anatomical site of involvement (e.g., knee, ankle) is documented; instead, use the appropriate site-specific code from the M02.3 subcategory.
• Always look for documentation of the underlying infection that triggered the reactive arthritis, and code it as an additional diagnosis if present and relevant.
• Do not confuse with other forms of seronegative spondyloarthropathies unless specifically documented as Reiter's disease.