049.9 VIRAL ENCEPHALITIS NOS

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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		A86	Unspecified viral encephalitis
049.9		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

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