049.9 VIRAL ENCEPHALITIS NOS

Code Information

Diagnosis Code: 049.9

Short Description: Viral encephalitis NOS

Long Description: Unspecified non-arthropod-borne viral diseases of central nervous system

Code Classification:

  • Infectious and parasitic diseases (001–139)
    • Poliomyelitis and other non-arthropod-borne viral diseases of central nervous system (045-049)
      • 049 Other non-arthropod-borne viral diseases of central nervous system
        • 049.9 Viral encephalitis NOS

Code Version: 2015 ICD-9-CM

References to Index of Diseases and Injuries

The code 049.9 has the following ICD-9-CM references to the Index of Diseases and Injuries
  • Disease, diseased - see also Syndrome
    • nonarthropod-borne NEC 078.89
      • central nervous system NEC 049.9
    • virus (filterable) NEC 078.89
      • central nervous system NEC 049.9
        • specified type NEC 049.8
      • nonarthropod-borne NEC 078.89
        • central nervous system NEC 049.9
          • specified NEC 049.8
  • Encephalitis (bacterial) (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) 323.9
    • viral, virus 049.9
      • arthropod-borne NEC 064
        • mosquito-borne 062.9
          • Australian X disease 062.4
          • California virus 062.5
          • Eastern equine 062.2
          • Ilheus virus 062.8
          • Japanese (B type) 062.0
          • Murray Valley 062.4
          • specified type NEC 062.8
          • St. Louis 062.3
          • type B 062.0
          • type C 062.3
          • Western equine 062.1
        • tick-borne 063.9
          • biundulant 063.2
          • Central European 063.2
          • Czechoslovakian 063.2
          • diphasic meningoencephalitis 063.2
          • Far Eastern 063.0
          • Langat 063.8
          • louping ill 063.1
          • Powassan 063.8
          • Russian spring-summer (taiga) 063.0
          • specified type NEC 063.8
        • vector unknown 064
      • slow acting NEC 046.8
      • specified type NEC 049.8
      • vaccination, prophylactic (against) V05.0
  • Infection, infected, infective (opportunistic) 136.9
    • virus, viral 079.99
      • central nervous system NEC 049.9
        • enterovirus 048
          • meningitis 047.9
            • specified type NEC 047.8
        • slow virus 046.9
          • specified condition NEC 046.8
      • encephalitis 049.9
        • arthropod-borne NEC 064
        • tick-borne 063.9
          • specified type NEC 063.8
  • Late - see also condition
    • effect(s) (of) - see also condition
      • encephalitis or encephalomyelitis (conditions classifiable to 323) - see category 326
        • in infectious diseases 139.8
          • viral (conditions classifiable to 049.8, 049.9, 062-064) 139.0
      • viral encephalitis (conditions classifiable to 049.8, 049.9, 062-064) 139.0
  • Myelitis (ascending) (cerebellar) (childhood) (chronic) (descending) (diffuse) (disseminated) (pressure) (progressive) (spinal cord) (subacute) (see also Encephalitis) 323.9
    • virus 049.9

Crosswalk Information

The code 049.9 converts into the following ICD-10 code(s):
ICD-9 Code ICD-10 Code ICD-10 Description
049.9 Right Arrow A86 Unspecified viral encephalitis
A89 Unspecified viral infection of central nervous system
This ICD-9 to ICD-10 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-9 Code ICD-9 Description
049.0 Lymphocytic choriomeningitis
049.1 Meningitis due to adenovirus
049.8 Other specified non-arthropod-borne viral diseases of central nervous system

This page was last updated on: 10/1/2014