ICD-10 Code A32.12 – Listerial meningoencephalitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A32.12 – Listerial meningoencephalitis
What it is
Listerial meningoencephalitis is a serious infection of the brain and surrounding meninges caused by Listeria monocytogenes. Use this code when documentation identifies both meningeal and encephalitic involvement.
Clinical signs
Common findings include fever, headache, neck stiffness, confusion, and other signs of central nervous system infection. Clinical features vary; refer to documentation.
When to use this code
Use A32.12 when the provider documents listerial meningoencephalitis, listerial meningitis with encephalitis, or a confirmed Listeria CNS infection involving both structures. Code it when the diagnosis is established in the record, not for exposure alone. Check documentation if the note only says meningitis or encephalitis.
Do not use for
Do not use this code for uncomplicated listeriosis without CNS involvement, or for meningitis/encephalitis caused by another organism. If the record does not specify Listeria, check documentation.
Coding tip
Assign the code only when the provider clearly links the CNS infection to Listeria monocytogenes.