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.
Applicable To
  • Louping ill
Code First
Code 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.
  • , if applicable, transfusion related infection (
    ICD-10-CM Diagnosis Code T80.22

    Acute infection following transfusion, infusion, or injection of blood and blood products

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    T80.22-
    )
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 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
    2021 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
  • 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
    Tick-borne viral encephalitis
ICD-10-CM A84.89 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 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

Diagnosis Index entries containing back-references to A84.89:
  • 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
          • specified NEC A84.89
      • 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
A84.81 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

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