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ICD-10-CM Codes
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A00-B99
Certain infectious and parasitic diseases
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A80-A89
Viral and prion infections of the central nervous system
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A84-
Tick-borne viral encephalitis
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2021 ICD-10-CM Diagnosis Code A84.89
2021 ICD-10-CM Diagnosis Code A84.89
Other tick-borne viral encephalitis
2021 - New Code Billable/Specific Code
- A84.89 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- ICD-10-CM A84.89 is a new 2021 ICD-10-CM code that became effective on October 1, 2020.
- This is the American ICD-10-CM version of A84.89 - other international versions of ICD-10 A84.89 may differ.
Code FirstCode First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, 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.
The following code(s) above
A84.89 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
A84.89:
- A00-B99
2021 ICD-10-CM Range A00-B99
Certain infectious and parasitic diseasesIncludes- 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.-)
- A80-A89
2021 ICD-10-CM Range A80-A89
Viral and prion infections of the central nervous systemType 1 Excludes- postpolio syndrome (G14)
- sequelae of poliomyelitis (B91)
- sequelae of viral encephalitis (B94.1)
- A84
ICD-10-CM Diagnosis Code A84
Tick-borne viral encephalitis
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
Includes- tick-borne viral meningoencephalitis
- 023 Craniotomy with major device implant or acute complex cns principal diagnosis with mcc or chemotherapy implant or epilepsy with neurostimulator
- 024 Craniotomy with major device implant or acute complex cns principal diagnosis without mcc
- 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
Code History
- 2021 (effective 10/1/2020): New code
- 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 Billable/Specific Code
Applicable To- Ventriculitis (cerebral) NOS
- viral, virus A86
ICD-10-CM Diagnosis Code A86
Unspecified viral encephalitis
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Viral encephalomyelitis NOS
- Viral meningoencephalitis NOS
- arthropod-borne NEC A85.2
ICD-10-CM Diagnosis Code A85.2
Arthropod-borne viral encephalitis, unspecified
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Type 1 Excludes- West nile virus with encephalitis (A92.31)
- tick-borne A84.9
ICD-10-CM Diagnosis Code A84.9
Tick-borne viral encephalitis, unspecified
2016 2017 2018 2019 2020 2021 Billable/Specific Code
- tick-borne, specified NEC A84.89
- louping ill A84.89
- Louping ill A84.89 (encephalitis)
ICD-10-CM Codes Adjacent To A84.89
A83.4 Australian encephalitis
A83.5 California encephalitis
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
A84.89
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
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
