Certain infectious and parasitic diseases (A00-B99)

Includes:
diseases generally recognized as communicable or transmissible
Use additional
code to identify resistance to antimicrobial drugs (Z16.-)
Excludes 1:
certain localized infections - see body system-related chapters
Excludes 2:
carrier or suspected carrier of infectious disease (Z22.-)
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)

Viral and prion infections of the central nervous system (A80-A89)

Excludes 1:
postpolio syndrome (G14)
sequelae of poliomyelitis (B91)
sequelae of viral encephalitis (B94.1)
A80 Acute poliomyelitis [+]
Excludes 1: acute flaccid myelitis (G04.82)
A81 Atypical virus infections of central nervous system [+]
Includes: diseases of the central nervous system caused by prions
Use additional code, if applicable, to identify:
Use additional dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
Use additional dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
Use additional dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
Use additional dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
Use additional dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
Use additional mild neurocognitive disorder due to known physiological condition (F06.7-)
A82 Rabies [+]
A83 Mosquito-borne viral encephalitis [+]
Includes: mosquito-borne viral meningoencephalitis
Excludes 2: Venezuelan equine encephalitis (A92.2)
West Nile fever (A92.3-)
West Nile virus (A92.3-)
A84 Tick-borne viral encephalitis [+]
Includes: tick-borne viral meningoencephalitis
A85 Other viral encephalitis, not elsewhere classified [+]
Includes: specified viral encephalomyelitis NEC
specified viral meningoencephalitis NEC
Excludes 1: encephalitis due to cytomegalovirus (B25.8)
encephalitis due to herpesvirus NEC (B10.0-)
encephalitis due to herpesvirus [herpes simplex] (B00.4)
encephalitis due to measles virus (B05.0)
encephalitis due to mumps virus (B26.2)
encephalitis due to poliomyelitis virus (A80.-)
encephalitis due to zoster (B02.0)
lymphocytic choriomeningitis (A87.2)
myalgic encephalomyelitis (G93.32)
A86 Unspecified viral encephalitis
Viral encephalomyelitis NOS
Viral meningoencephalitis NOS
A87 Viral meningitis [+]
Excludes 1: meningitis due to herpesvirus [herpes simplex] (B00.3)
meningitis due to herpesvirus [herpes simplex] (B00.3)
meningitis due to measles virus (B05.1)
meningitis due to mumps virus (B26.1)
meningitis due to poliomyelitis virus (A80.-)
meningitis due to zoster (B02.1)
A88 Other viral infections of central nervous system, not elsewhere classified [+]
Excludes 1: viral encephalitis NOS (A86)
viral meningitis NOS (A87.9)
A89 Unspecified viral infection of central nervous system

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