ICD-10 Code M02.18 – Postdysenteric arthropathy, vertebrae (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.18 – Postdysenteric arthropathy, vertebrae
What it is
M02.18 identifies reactive arthropathy affecting the vertebrae after dysentery. Use it when the record links spinal joint inflammation to a prior enteric infection rather than to trauma or degenerative disease.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may describe inflammatory back pain, spinal stiffness, or sacroiliac or vertebral involvement after a recent dysenteric illness.
When to use this code
Use this code when the provider documents postdysenteric arthropathy with vertebral involvement, or when the assessment clearly ties the spinal arthritis to a preceding dysenteric infection. Check that the vertebrae are specifically affected, not another joint.
If the chart only mentions arthritis after infection without site detail, or the cause is uncertain, you should check documentation before assigning M02.18.
Do not use for
Do not use this code for nonspecific back pain, degenerative spine disease, or septic arthritis. It is also inappropriate when the record does not support a postdysenteric cause.
Coding tip
Confirm both elements in the note: prior dysentery and vertebral arthropathy; if either is missing, query the provider.