2024 ICD-10-CM Diagnosis Code A86

by

Unspecified viral encephalitis

  • A86 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM A86 became effective on October 1, 2023.
  • 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

 that may be applicable to A86:

  • A00-B99  Certain infectious and parasitic diseases
  • A80-A89  Viral and prion infections of the central nervous system

Approximate Synonyms

  • 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 v41.0):

  • 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-CMCode 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
  • 2024 (effective 10/1/2023): No change

Code annotations containing back-references to A86:

  • Type 1 Excludes: A88

Diagnosis Index entries containing back-references to A86: