Diagnosis Code


Code Information

Diagnosis Code: A86

Short Description: Unspecified viral encephalitis

Long Description: Unspecified viral encephalitis

The code A86 is VALID for claim submission

Code Classification:

  • Certain infectious and parasitic diseases (A00–B99)
    • Viral and prion infections of the central nervous system (A80-A89)
      • Unspecified viral encephalitis (A86)
        • A86 Unspecified viral encephalitis

Code Version: 2022 ICD-10-CM


  • Acute necrotizing encephalitis
  • Acute viral encephalitis
  • Chronic echovirus meningoencephalitis
  • Chronic infectious disease of central nervous system
  • Chronic meningitis
  • Chronic viral encephalitis
  • Dementia associated with viral encephalitis
  • Echovirus meningitis
  • Enterovirus meningitis
  • Epidemic encephalitis
  • Infective ventriculitis
  • Primary encephalitis
  • Primary viral encephalitis
  • Ventriculitis of the brain
  • Viral encephalitis
  • Viral meningoencephalitis
  • Viral ventriculitis

References to Index of Diseases and Injuries

The code A86 has the following ICD-10-CM references to the Index of Diseases and Injuries
  • Inclusion Terms:
    • Viral encephalomyelitis NOS
    • Viral meningoencephalitis NOS

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
A86 Right Arrow 049.9 Viral encephalitis NOS

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description

This page was last updated on: 10/1/2021