ICD-10 Code B00.82 – Herpes simplex myelitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B00.82 – Herpes simplex myelitis
What it is
B00.82 identifies myelitis caused by herpes simplex virus. Use it when the record documents spinal cord inflammation linked to HSV infection.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include acute or subacute weakness, sensory changes, back pain, and bladder or bowel dysfunction consistent with spinal cord involvement.
When to use this code
Use this code when the provider clearly documents herpes simplex myelitis, HSV myelitis, or spinal cord inflammation attributed to herpes simplex infection. It applies when the diagnosis is established in the chart, not merely suspected.
If the note describes neurologic deficits with confirmed HSV involvement of the spinal cord, this code is appropriate. Check documentation for the specific viral cause and whether the condition is active or historical.
Do not use for
Do not use B00.82 for nonspecific myelitis without herpes simplex attribution, or for other herpesvirus infections. Check documentation if the record only says “encephalitis,” “meningitis,” or “viral myelopathy.”
Coding tip
Code the documented HSV spinal cord diagnosis exactly as stated and verify any additional codes needed for associated herpes infection.