Reiter's disease, vertebrae

This code signifies an inflammatory arthropathy affecting the vertebrae, specifically associated with Reiter's syndrome (now more commonly referred to as reactive arthritis). It represents the spinal manifestation of this autoimmune condition, often triggered by a preceding infection. The inflammation can lead to pain, stiffness, and structural changes in the vertebral column.

Use this code when documentation explicitly states "Reiter's disease of the vertebrae" or "reactive arthritis affecting the spine." It is appropriate for patients presenting with spondylitis or sacroiliitis confirmed to be part of a reactive arthritis diagnosis. Physician notes should clearly link the vertebral involvement to Reiter's syndrome.

• Ensure documentation specifies vertebral involvement; otherwise, a more general reactive arthritis code may be appropriate.
• Do not confuse with other forms of spondyloarthropathy unless the reactive arthritis etiology is clearly documented.
• Code any associated infectious triggers (e.g., Chlamydia, Shigella) as additional diagnoses.