2023

  1. ICD-10-CM Codes
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  2. A00-B99
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  3. A80-A89
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  4. A85-
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  5. 2023 ICD-10-CM Diagnosis Code A85

2023 ICD-10-CM Diagnosis Code A85

Other viral encephalitis, not elsewhere classified

    2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
  • A85 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 A85 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of A85 - other international versions of ICD-10 A85 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as A85. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • encephalitis due to cytomegalovirus (
    ICD-10-CM Diagnosis Code B25.8

    Other cytomegaloviral diseases

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Cytomegaloviral encephalitis
    B25.8
    )
  • encephalitis due to herpesvirus NEC (
    ICD-10-CM Diagnosis Code B10.0

    Other human herpesvirus encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • herpes encephalitis NOS (B00.4)
    • herpes simplex encephalitis (B00.4)
    • human herpesvirus encephalitis (B00.4)
    • simian B herpes virus encephalitis (B00.4)
    B10.0-
    )
  • encephalitis due to herpesvirus [herpes simplex] (
    ICD-10-CM Diagnosis Code B00.4

    Herpesviral encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Herpesviral meningoencephalitis
    • Simian B disease
    Type 1 Excludes
    • herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09)
    • non-simplex herpesviral encephalitis (B10.0-)
    B00.4
    )
  • encephalitis due to measles virus (
    ICD-10-CM Diagnosis Code B05.0

    Measles complicated by encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Postmeasles encephalitis
    B05.0
    )
  • encephalitis due to mumps virus (
    ICD-10-CM Diagnosis Code B26.2

    Mumps encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    B26.2
    )
  • encephalitis due to poliomyelitis virus (
    ICD-10-CM Diagnosis Code A80
    • A80 Acute poliomyelitis
      • A80.0 Acute paralytic poliomyelitis, vaccine-associ...
      • A80.1 Acute paralytic poliomyelitis, wild virus, im...
      • A80.2 Acute paralytic poliomyelitis, wild virus, in...
      • A80.3 Acute paralytic poliomyelitis, other and unsp...
        • A80.30 Acute paralytic poliomyelitis, unspecified
        • A80.39 Other acute paralytic poliomyelitis
      • A80.4 Acute nonparalytic poliomyelitis
      • A80.9 Acute poliomyelitis, unspecified
    A80.-
    )
  • encephalitis due to zoster (
    ICD-10-CM Diagnosis Code B02.0

    Zoster encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Zoster meningoencephalitis
    B02.0
    )
  • lymphocytic choriomeningitis (
    ICD-10-CM Diagnosis Code A87.2

    Lymphocytic choriomeningitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Lymphocytic meningoencephalitis
    A87.2
    )
  • myalgic encephalomyelitis (
    ICD-10-CM Diagnosis Code G93.32

    Myalgic encephalomyelitis/chronic fatigue syndrome

      2023 - New Code Billable/Specific Code
    Applicable To
    • Chronic fatigue syndrome
    • ME/CFS
    • Myalgic encephalomyelitis
    G93.32
    )
Includes
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • specified viral encephalomyelitis NEC
  • specified viral meningoencephalitis NEC
The following code(s) above A85 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 A85:
  • 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 A85
A83.6 Rocio virus disease
A83.8 Other mosquito-borne viral encephalitis
A83.9 Mosquito-borne viral encephalitis, unspecified
A84 Tick-borne viral encephalitis
A84.0 Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
A84.1 Central European tick-borne encephalitis
A84.8 Other tick-borne viral encephalitis
A84.81 Powassan virus disease
A84.89 Other tick-borne viral encephalitis
A84.9 Tick-borne viral encephalitis, unspecified
A85 Other viral encephalitis, not elsewhere classified
A85.0 Enteroviral encephalitis
A85.1 Adenoviral encephalitis
A85.2 Arthropod-borne viral encephalitis, unspecified
A85.8 Other specified viral encephalitis
A86 Unspecified viral encephalitis
A87 Viral meningitis
A87.0 Enteroviral meningitis
A87.1 Adenoviral meningitis
A87.2 Lymphocytic choriomeningitis
A87.8 Other viral meningitis

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

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