ICD-10 Code B01.0 – Varicella meningitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B01.0 – Varicella meningitis
What it is
B01.0 identifies meningitis caused by varicella-zoster virus. Use it when documentation shows meningitis due to varicella infection, not just a history of chickenpox.
Clinical signs
Clinical features vary; refer to documentation. Typical meningitis findings may include headache, fever, neck stiffness, photophobia, or altered mental status, with evidence linking the illness to varicella-zoster virus.
When to use this code
Use B01.0 when the provider documents varicella meningitis, chickenpox meningitis, or meningitis due to varicella infection. Code it for confirmed or clearly documented viral meningitis attributed to varicella-zoster virus. Check documentation if the note only says meningitis without a cause.
Do not use for
Do not use this code for uncomplicated varicella, encephalitis, or meningitis from another organism. If the record does not specify varicella as the cause, choose the documented diagnosis only.
Coding tip
Match the code to the documented viral cause; if varicella is not stated, verify the provider’s final diagnosis before coding.