Atypical virus infections of central nervous system
Non-billable header
A81 is a non-billable header code. Use one of the more specific codes below.
Inclusion terms
Includes
- diseases generally recognized as communicable or transmissible
- diseases of the central nervous system caused by prions
Excludes1
Not coded here — never report together with this code.
Excludes2
Not included here — may be reported together when both conditions exist.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use additional code
Add a code to identify the following, if applicable.
- code to identify resistance to antimicrobial drugs (Z16.-)
- 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-)
More specific codes A81
Related codes
- A80Acute poliomyelitisHeader
- A82RabiesHeader
- A83Mosquito-borne viral encephalitisHeader
- A84Tick-borne viral encephalitisHeader
- A85Other viral encephalitis, not elsewhere classifiedHeader
- A86Unspecified viral encephalitisBillable
- A87Viral meningitisHeader
- A88Other viral infections of central nervous system, not elsewhere classifiedHeader
- A89Unspecified viral infection of central nervous systemBillable