ICD-10 Code A32.9 – Listeriosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A32.9 – Listeriosis, unspecified
What it is
A32.9 identifies listeriosis when the record confirms infection with Listeria but does not specify a form or site. Use this code for an unspecified presentation of the disease.
Clinical signs
Clinical features vary; refer to documentation. Listeriosis may present with fever, gastrointestinal illness, or invasive infection, but the chart must support the diagnosis rather than a vague exposure or rule-out.
When to use this code
Use A32.9 when the provider documents listeriosis and does not further describe the condition as meningitis, sepsis, or another specified manifestation. It is appropriate when the note confirms the diagnosis but lacks detail for a more specific code. Check documentation if the record only states suspected infection or exposure.
Do not use for
Do not use this code for Listeria exposure, carrier status, or a suspected diagnosis without confirmation. If the provider documents a specific listeriosis manifestation, code that condition instead.
Coding tip
Query the provider when listeriosis is mentioned but the manifestation is unclear, because a more specific code may be available.