Atypical virus infection of central nervous system, unspecified
Billable / specificHCC V28 127
A81.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Applicable to
- Prion diseases of the central nervous system NOS
Includes (from A81)
- 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.-) (from A81)
- certain localized infections - see body system-related chapters (from A81)
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-) (from A81)
- infectious and parasitic diseases specific to the perinatal period (P35-P39) (from A81)
- influenza and other acute respiratory infections (J00-J22) (from A81)
Use additional code
Add a code to identify the following, if applicable.
- code to identify resistance to antimicrobial drugs (Z16.-) (from A81)
- code, if applicable, to identify: (from A81)
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4) (from A81)
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-) (from A81)
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3) (from A81)
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2) (from A81)
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0) (from A81)
- mild neurocognitive disorder due to known physiological condition (F06.7-) (from A81)
Also known as
- Prion diseases of the central nervous system NOS
- Disease, diseased, prion, central nervous system
- Infection, infected, infective, atypical, virus
- Infection, infected, infective, slow virus
- Infection, infected, infective, virus, viral NOS, central nervous system, atypical
- Infection, infected, infective, virus, viral NOS, central nervous system, slow virus
- Infection, infected, infective, virus, viral NOS, slow
Parent code
- A81Atypical virus infections of central nervous systemHeader