2023 ICD-10-CM Diagnosis Code A81

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Atypical virus infections of central nervous system

    2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
  • A81 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2023 edition of ICD-10-CM A81 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of A81 - other international versions of ICD-10 A81 may differ.
Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code, if applicable, to identify:
  • dementia with anxiety (
    ICD-10-CM Diagnosis Code F02.84

    Dementia in other diseases classified elsewhere, unspecified severity, with anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Major neurocognitive disorder in other diseases classified elsewhere unspecified severity, with anxiety
    F02.84
    ,
    ICD-10-CM Diagnosis Code F02.A4

    Dementia in other diseases classified elsewhere, mild, with anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Major neurocognitive disorder in other diseases classified elsewhere, mild, with anxiety
    F02.A4
    ,
    ICD-10-CM Diagnosis Code F02.B4

    Dementia in other diseases classified elsewhere, moderate, with anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Major neurocognitive disorder in other diseases classified elsewhere, moderate, with anxiety
    F02.B4
    ,
    ICD-10-CM Diagnosis Code F02.C4

    Dementia in other diseases classified elsewhere, severe, with anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Major neurocognitive disorder in other diseases classified elsewhere, severe, with anxiety
    F02.C4
    )
  • dementia with behavioral disturbance (
    ICD-10-CM Diagnosis Code F02.81

    Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance

      2016 2017 2018 2019 2020 2021 2022 2023 - Converted to Parent Code Non-Billable/Non-Specific Code
    F02.81-
    ,
    ICD-10-CM Diagnosis Code F02.A1

    Dementia in other diseases classified elsewhere, mild, with behavioral disturbance

      2023 - New Code Non-Billable/Non-Specific Code
    F02.A1-
    ,
    ICD-10-CM Diagnosis Code F02.B1

    Dementia in other diseases classified elsewhere, moderate, with behavioral disturbance

      2023 - New Code Non-Billable/Non-Specific Code
    F02.B1-
    ,
    ICD-10-CM Diagnosis Code F02.C1

    Dementia in other diseases classified elsewhere, severe, with behavioral disturbance

      2023 - New Code Non-Billable/Non-Specific Code
    F02.C1-
    )
  • dementia with mood disturbance (
    ICD-10-CM Diagnosis Code F02.83

    Dementia in other diseases classified elsewhere, unspecified severity, with mood disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, unspecified severity, with mood disturbance such as depression, apathy, or anhedonia
    • Major neurocognitive disorder in other diseases classified elsewhere unspecified severity, with mood disturbance such as with depression, apathy, or anhedonia
    F02.83
    ,
    ICD-10-CM Diagnosis Code F02.A3

    Dementia in other diseases classified elsewhere, mild, with mood disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, mild, with mood disturbance such as depression, apathy, or anhedonia
    • Major neurocognitive disorder in other diseases classified elsewhere, mild, with mood disturbance such as depression, apathy, or anhedonia
    F02.A3
    ,
    ICD-10-CM Diagnosis Code F02.B3

    Dementia in other diseases classified elsewhere, moderate, with mood disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, moderate, with mood disturbance such as depression, apathy, or anhedonia
    • Major neurocognitive disorder in other diseases classified elsewhere, moderate, with mood disturbance such as depression, apathy, or anhedonia
    F02.B3
    ,
    ICD-10-CM Diagnosis Code F02.C3

    Dementia in other diseases classified elsewhere, severe, with mood disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, severe, with mood disturbance such as depression, apathy, or anhedonia
    • Major neurocognitive disorder in other diseases classified elsewhere, severe, with mood disturbance such as depression, apathy, or anhedonia
    F02.C3
    )
  • dementia with psychotic disturbance (
    ICD-10-CM Diagnosis Code F02.82

    Dementia in other diseases classified elsewhere, unspecified severity, with psychotic disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, unspecified severity, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    • Major neurocognitive disorder in other diseases classified elsewhere, unspecified, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    F02.82
    ,
    ICD-10-CM Diagnosis Code F02.A2

    Dementia in other diseases classified elsewhere, mild, with psychotic disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, mild, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    • Major neurocognitive disorder in other diseases classified elsewhere, mild, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    F02.A2
    ,
    ICD-10-CM Diagnosis Code F02.B2

    Dementia in other diseases classified elsewhere, moderate, with psychotic disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, moderate, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    • Major neurocognitive disorder in other diseases classified elsewhere, moderate, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    F02.B2
    ,
    ICD-10-CM Diagnosis Code F02.C2

    Dementia in other diseases classified elsewhere, severe, with psychotic disturbance

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, severe, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    • Major neurocognitive disorder in other diseases classified elsewhere, severe, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
    F02.C2
    )
  • dementia without behavioral disturbance (
    ICD-10-CM Diagnosis Code F02.80

    Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

      2016 2017 2018 2019 2020 2021 2022 2023 - Revised Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere NOS
    • Major neurocognitive disorder in other diseases classified elsewhere NOS
    F02.80
    ,
    ICD-10-CM Diagnosis Code F02.A0

    Dementia in other diseases classified elsewhere, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, mild, NOS
    • Major neurocognitive disorder in other diseases classified elsewhere, mild, NOS
    F02.A0
    ,
    ICD-10-CM Diagnosis Code F02.B0

    Dementia in other diseases classified elsewhere, moderate, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, moderate, NOS
    • Major neurocognitive disorder in other diseases classified elsewhere, moderate, NOS
    F02.B0
    ,
    ICD-10-CM Diagnosis Code F02.C0

    Dementia in other diseases classified elsewhere, severe, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

      2023 - New Code Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere, severe, NOS
    • Major neurocognitive disorder in other diseases classified elsewhere, severe, NOS
    F02.C0
    )
  • mild neurocognitive disorder due to known physiological condition (
    ICD-10-CM Diagnosis Code F06.7

    Mild neurocognitive disorder due to known physiological condition

      2023 - New Code Non-Billable/Non-Specific Code
    Applicable To
    • Mild neurocognitive impairment due to a known physiological condition
    Code First
    • the underlying physiological condition, such as:
    • Alzheimer's disease (G30.-)
    • frontotemporal neurocognitive disorder (G31.09)
    • human immunodeficiency virus [HIV] disease (B20)
    • Huntington's disease (G10)
    • Neurocognitive disorder with Lewy bodies (G31.83)
    • Parkinson's disease (G20)
    • systemic lupus erythematosus (M32.-)
    • traumatic brain injury (S06.-)
    • vitamin B deficiency (E53-)
    Type 1 Excludes
    F06.7-
    )
Includes
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • diseases of the central nervous system caused by prions
The following code(s) above A81 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to A81:
  • A00-B99
    2023 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    Includes
    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • 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)
    Use Additional
    • code to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases
  • A80-A89
    2023 ICD-10-CM Range A80-A89

    Viral and prion infections of the central nervous system

    Type 1 Excludes
    • postpolio syndrome (G14)
    • sequelae of poliomyelitis (B91)
    • sequelae of viral encephalitis (B94.1)
    Viral and prion infections of the central nervous system
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
ICD-10-CM Codes Adjacent To A81
A79.9 Rickettsiosis, unspecified
A80 Acute poliomyelitis
A80.0 Acute paralytic poliomyelitis, vaccine-associated
A80.1 Acute paralytic poliomyelitis, wild virus, imported
A80.2 Acute paralytic poliomyelitis, wild virus, indigenous
A80.3 Acute paralytic poliomyelitis, other and unspecified
A80.30 Acute paralytic poliomyelitis, unspecified
A80.39 Other acute paralytic poliomyelitis
A80.4 Acute nonparalytic poliomyelitis
A80.9 Acute poliomyelitis, unspecified
A81 Atypical virus infections of central nervous system
A81.0 Creutzfeldt-Jakob disease
A81.00 …… unspecified
A81.01 Variant Creutzfeldt-Jakob disease
A81.09 Other Creutzfeldt-Jakob disease
A81.1 Subacute sclerosing panencephalitis
A81.2 Progressive multifocal leukoencephalopathy
A81.8 Other atypical virus infections of central nervous system
A81.81 Kuru
A81.82 Gerstmann-Sträussler-Scheinker syndrome
A81.83 Fatal familial insomnia

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.