Valid for Submission
A86 is a billable code used to specify a medical diagnosis of unspecified viral encephalitis. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code A86 might also be used to specify conditions or terms like acute necrotizing encephalitis, acute viral encephalitis, chronic echovirus meningoencephalitis, chronic meningitis, chronic viral encephalitis, dementia associated with viral encephalitis, etc
| ICD-10: | A86 |
| Short Description: | Unspecified viral encephalitis |
| Long Description: | Unspecified viral encephalitis |
Tabular List of Diseases and Injuries
The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code A86:
Inclusion Terms
Inclusion TermsThese terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Viral encephalomyelitis NOS
- Viral meningoencephalitis NOS
Index to Diseases and Injuries
The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code A86 are found in the index:
- - Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) - G04.90
- - acute - See Also: Encephalitis, viral; - A86
- - infectious (acute) (virus) NEC - A86
- - Meningoencephalitis - See Also: Encephalitis; - G04.90
- - Meningoencephalomyelitis - See Also: Meningoencephalitis;
Synonyms
The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:
- Acute necrotizing encephalitis
- Acute viral encephalitis
- Chronic echovirus meningoencephalitis
- Chronic meningitis
- Chronic viral encephalitis
- Dementia associated with viral encephalitis
- Echovirus disease
- Echovirus meningitis
- Enterovirus meningitis
- Epidemic encephalitis
- Infective ventriculitis
- Primary encephalitis
- Primary viral encephalitis
- Ventriculitis of the brain
- Viral encephalitis
- Viral meningoencephalitis
- Viral ventriculitis
Clinical Information
- ENCEPHALITIS CALIFORNIA-. a viral infection of the brain caused by serotypes of california encephalitis virus encephalitis virus california transmitted to humans by the mosquito aedes triseriatus. the majority of cases are caused by the la crosse virus. this condition is endemic to the midwestern united states and primarily affects children between 5 10 years of age. clinical manifestations include fever; vomiting; headache; and abdominal pain followed by seizures altered mentation and focal neurologic deficits. from joynt clinical neurology 1996 ch26 p13
- ENCEPHALITIS ARBOVIRUS-. infections of the brain caused by arthropod borne viruses i.e. arboviruses primarily from the families togaviridae; flaviviridae; bunyaviridae; reoviridae; and rhabdoviridae. life cycles of these viruses are characterized by zoonoses with birds and lower mammals serving as intermediate hosts. the virus is transmitted to humans by the bite of mosquitoes culicidae or ticks. clinical manifestations include fever headache alterations of mentation focal neurologic deficits and coma. from clin microbiol rev 1994 jan;71:89 116; walton brain's diseases of the nervous system 10th ed p321
- ENCEPHALITIS JAPANESE-. a mosquito borne encephalitis caused by the japanese b encephalitis virus encephalitis virus japanese occurring throughout eastern asia and australia. the majority of infections occur in children and are subclinical or have features limited to transient fever and gastrointestinal symptoms. inflammation of the brain spinal cord and meninges may occur and lead to transient or permanent neurologic deficits including a poliomyelitis like presentation; seizures; coma; and death. from adams et al. principles of neurology 6th ed p751; lancet 1998 apr 11;3519109:1094 7
- ENCEPHALITIS VIRAL-. 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.
Convert A86 to ICD-9
- 049.9 - Viral encephalitis NOS (Approximate Flag)
Code Classification
Code History
- FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
(First year ICD-10-CM implemented into the HIPAA code set) - FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
- FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
- FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
- FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020