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ICD-10-CM Codes
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A00-B99
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A80-A89
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A86-
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2023 ICD-10-CM Diagnosis Code A86
2023 ICD-10-CM Diagnosis Code A86
Unspecified viral encephalitis
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- A86 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2023 edition of ICD-10-CM A86 became effective on October 1, 2022.
- This is the American ICD-10-CM version of A86 - other international versions of ICD-10 A86 may differ.
Applicable To- Viral encephalomyelitis NOS
- Viral meningoencephalitis NOS
The following code(s) above
A86 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
A86:
- Encephalitis infective
- Infective encephalitis
- Viral encephalitis
Clinical Information
- Inflammation of brain parenchymal tissue as a result of viral infection. Encephalitis may occur as primary or secondary manifestation of togaviridae infections; herpesviridae infections; adenoviridae infections; flaviviridae infections; bunyaviridae infections; picornaviridae infections; paramyxoviridae infections; orthomyxoviridae infections; retroviridae infections; and arenaviridae infections.
ICD-10-CM A86 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
- 097 Non-bacterial infection of nervous system except viral meningitis with mcc
- 098 Non-bacterial infection of nervous system except viral meningitis with cc
- 099 Non-bacterial infection of nervous system except viral meningitis without cc/mcc
- 974 Hiv with major related condition with mcc
- 975 Hiv with major related condition with cc
- 976 Hiv with major related condition without cc/mcc
Convert A86 to ICD-9-CM
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
Code annotations containing back-references to A86:
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) G04.90
ICD-10-CM Diagnosis Code G04.90
Encephalitis and encephalomyelitis, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Ventriculitis (cerebral) NOS
- Meningoencephalitis G04.90 - see also Encephalitis
ICD-10-CM Diagnosis Code G04.90
Encephalitis and encephalomyelitis, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Ventriculitis (cerebral) NOS
- Meningoencephalomyelitis - see also Meningoencephalitis
ICD-10-CM Codes Adjacent To A86
A84.1 Central European tick-borne encephalitis
A84.8 Other tick-borne viral encephalitis
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
A87.0 Enteroviral meningitis
A87.1 Adenoviral meningitis
A87.2 Lymphocytic choriomeningitis
A87.8 Other viral meningitis
A87.9 Viral meningitis, unspecified
A88 Other viral infections of central nervous system, not elsewhere classified
A88.0 Enteroviral exanthematous fever [Boston exanthem]
A88.8 Other specified viral infections of central nervous system
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
