Reiter's disease, left shoulder

This diagnosis code signifies reactive arthritis, also known as Reiter's syndrome, specifically affecting the left shoulder joint. It is a form of seronegative spondyloarthropathy triggered by an infection elsewhere in the body, leading to inflammatory arthritis.

Use this code when documentation clearly indicates a diagnosis of Reiter's disease with inflammatory involvement of the patient's left shoulder. Supporting documentation should include physician notes detailing the diagnosis and the specific joint affected.

• Ensure the documentation specifies "Reiter's disease" or "reactive arthritis" and clearly identifies the left shoulder as the affected site.
• Do not confuse with other forms of inflammatory arthritis if the documentation does not explicitly state Reiter's disease.
• Consider sequencing this code after the code for the underlying infection, if known and still active, as per ICD-10-CM guidelines.