ICD-10 Code A39.9 – Meningococcal infection, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A39.9 – Meningococcal infection, unspecified
What it is
A39.9 identifies a meningococcal infection when the organism is known or suspected, but the specific clinical form is not documented. Use it for Neisseria meningitidis infection without a more precise subtype.
Clinical signs
Clinical features vary; refer to documentation. Meningococcal infection may present with fever, headache, neck stiffness, rash, or signs of sepsis, but you should code only what is documented.
When to use this code
Use A39.9 when the record states meningococcal infection and does not specify meningitis, septicemia, or another manifestation. It also fits when the provider documents meningococcal disease without further detail. Check documentation if the site or complication is described elsewhere.
Do not use for
Do not use this code if the chart identifies meningococcal meningitis, meningococcemia, or another specific manifestation. Avoid it when documentation names a different organism or another cause of meningitis.
Coding tip
Code the most specific meningococcal diagnosis available, and query for clarification when the record is nonspecific.