Atypical virus infections of central nervous system

**Includes:** - diseases of the central nervous system caused by prions

**Use additional code:** - code, if applicable, to identify: - dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4) - 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-)