A81 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Atypical virus infections of central nervous system.
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Diseases of the central nervous system caused by prions
Code, if applicable, to identify:
Dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
Dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
Dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
Dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
Mild neurocognitive disorder due to known physiological condition (F06.7-)
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