ICD-10 Code B60.11 – Meningoencephalitis due to Acanthamoeba (culbertsoni) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B60.11 – Meningoencephalitis due to Acanthamoeba (culbertsoni)
What it is
B60.11 identifies meningoencephalitis caused by Acanthamoeba culbertsoni, a rare protozoal infection affecting the brain and meninges. Use it when documentation names this organism as the cause.
Clinical signs
Clinical features vary; refer to documentation. Standard references describe headache, fever, altered mental status, focal neurologic deficits, and signs of meningeal or brain inflammation.
When to use this code
Use this code when the provider documents meningoencephalitis due to Acanthamoeba culbertsoni, or clearly links the infection to that organism. It is appropriate for confirmed or specifically diagnosed cases, not for nonspecific encephalitis. Check documentation if the record only says amoebic infection.
Do not use for
Do not use B60.11 for other causes of meningitis or encephalitis, including viral, bacterial, or fungal infections. Do not assign it when Acanthamoeba is suspected but not documented.
Coding tip
Code the organism exactly as documented; if the species is not stated, check documentation before selecting B60.11.