ICD-10 Code A88.8 – Other specified viral infections of central nervous system (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A88.8 – Other specified viral infections of central nervous system
What it is
This code identifies a viral infection affecting the central nervous system that does not fit a more specific ICD-10 category. Use it when the provider documents a named viral CNS infection that is otherwise unspecified in coding references.
Clinical signs
Clinical features may include neurologic symptoms such as headache, fever, altered mental status, seizures, or focal deficits. Clinical features vary; refer to documentation.
When to use this code
Use A88.8 when the record clearly states a viral infection of the brain, spinal cord, or meninges, but no more specific code applies. It also fits when the provider documents an “other specified” viral CNS infection and the type is not separately classified. Check documentation for the exact organism or syndrome.
Do not use for
Do not use this code for bacterial, fungal, parasitic, or noninfectious neurologic disorders. If the chart supports a more specific viral CNS diagnosis, code that condition instead.
Coding tip
Confirm the provider’s wording and code the documented viral CNS condition as specifically as possible before defaulting to A88.8.