ICD-10 Code A39 – Meningococcal infection (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A39 – Meningococcal infection
What it is
A39 identifies meningococcal infection caused by Neisseria meningitidis. Use it for invasive disease due to this organism when the documentation does not specify a more exact site or manifestation.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include fever, headache, neck stiffness, rash, sepsis, or meningitis, depending on the infected site.
When to use this code
Use A39 when the provider documents meningococcal infection without a more specific ICD-10-CM code. It may apply to meningitis, septicemia, or other invasive meningococcal disease when the record supports Neisseria meningitidis as the cause. Check documentation for the exact manifestation and any additional codes needed.
Do not use for
Do not use A39 for suspected meningococcal disease without confirmation if the record supports another code. Do not use it when a more specific meningococcal diagnosis is documented.
Coding tip
Code the confirmed organism and any documented manifestation separately when the record supports greater specificity.