AutoICD API

A86

Billable

Unspecified viral encephalitis

Unspecified viral encephalitis

Status

Billable / Specific

Block

A80-A89

ICD-11 Mapping

1 equivalent

Coding Notes

Inclusion Terms

Alternative clinical terms for this condition

  • Viral encephalomyelitis NOS
  • Viral meningoencephalitis NOS

Includes

Conditions included under this code

  • diseases generally recognized as communicable or transmissible

Excludes 1

Codes that cannot be used together with this code (mutual exclusion)

Excludes 2

Conditions not included here, but the patient may have both

Use Additional Code

Additional codes that should follow this code

ICD-11 Equivalents(1)

ICD-11 Equivalents

View full mapping

Corresponding ICD-11 codes from the WHO crosswalk mapping

1C80Viral encephalitis, not elsewhere classifiedequivalentPrimary
Also Known As / Clinical Terms(141)

SNOMED CT

UMLS

Clinical Terms

  • Encephalitis viral NOS
  • LCM - Lymphocytic choriomeningitis
  • Viral ventriculitis, brain
  • Viral meningoencephalitis
  • INFECT ENCEPH VIRAL
  • Acute necrotizing viral encephalitis
  • Acute viral encephalitis
  • Enterovirus meningitis
  • viral encephalitis
  • Encephalomyelitis, Infectious, Viral
  • Viral ventriculitis
  • ECHO viral meningitis
  • Viral meningoencephalitis NOS
  • Meningitis caused by lymphocytic choriomeningitis virus
  • Chronic meningitis
  • Echovirus encephalitis
  • Encephalitis, viral
  • Meningitis due to ECHO virus
  • Ventriculitis of the brain
  • Viral encephalitis (disorder)
  • EM - Enteroviral meningitis
  • Arenavirus encephalitis
  • Lymphocytic choriomeningitis virus infection
  • Chronic infection of central nervous system
  • Primary viral encephalitis
  • Acute inclusion body encephalitis
  • Viral Infectious Encephalomyelitis
  • Meningitis caused by echovirus
  • Meningoencephalitis caused by virus
  • Viral encephalomyelitis NOS
  • Armstrong's disease
  • Infective ventriculitis
  • Echovirus meningitis
  • Encephalitis viral
  • Arenavirus meningitis
  • Acute necrotizing encephalitis
  • Dementia associated with viral encephalitis
  • Encephalomyelitis viral
  • Acute necrotising encephalitis
  • Meningoencephalitis viral
  • Lymphocytic choriomeningitis virus meningoencephalitis
  • Infective ventriculitis, brain
  • ENCEPH VIRAL
  • Chronic infectious disease of central nervous system
  • Encephalomyelitis, Viral Infectious
  • Chronic viral encephalitis
  • Primary encephalitis
  • Meningitis caused by genus Arenavirus
  • Encephalitis caused by human echovirus
  • VIRAL ENCEPH
  • Acute encephalitis
  • Encephalitis caused by Lymphocytic choriomeningitis virus
  • Infectious Encephalomyelitis, Viral
  • Meningitis caused by Enterovirus
  • Meningoencephalitis caused by Lymphocytic choriomeningitis virus
  • Encephalitis caused by echovirus
  • Epidemic encephalitis
  • Infection caused by Lymphocytic choriomeningitis virus
  • Chronic echovirus meningoencephalitis
  • Meningoencephalitis caused by virus (disorder)
  • Encephalitis caused by Arenavirus
  • Lymphocytic choriomeningitis virus encephalitis
  • ENCEPH INFECT VIRAL
  • Meningitis caused by Arenavirus
  • Acute necrotising viral encephalitis
  • Lymphocytic choriomeningitis
Frequently Asked Questions
What is the ICD-10 code for unspecified viral encephalitis?

The ICD-10-CM code for unspecified viral encephalitis is A86. The full clinical description is "Unspecified viral encephalitis". A86 is a billable/specific code that can be used on insurance claims and medical billing.

What does ICD-10 code A86 mean?

ICD-10-CM code A86 represents “Unspecified viral encephalitis”. It is classified under Chapter 1: Certain Infectious and Parasitic Diseases and is a billable/specific code that can be used on a claim.

Is A86 a billable code?

Yes, A86 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.

What chapter is A86 in?

A86 is in Chapter 1: Certain Infectious and Parasitic Diseases (codes A00-B99).

What codes cannot be used with A86?

A86 has Excludes1 notes indicating codes that cannot be used together with it, including: certain localized infections - see body system-related chapters; postpolio syndrome (G14); sequelae of poliomyelitis (B91); and 1 more.

Are additional codes required with A86?

Yes, when using A86, also report: resistance to antimicrobial drugs (Z16.-).

What SNOMED CT codes does A86 map to?

A86 maps to 25 SNOMED CT concepts: 822021000000103, 230161000, 111897007, 1163106008, 1163470008, and 20 more. SNOMED CT is a clinical terminology used in electronic health records.

What are the UMLS CUIs for A86?

A86 is linked to 3 UMLS Concept Unique Identifiers: C0243010, C2900458, C1403880. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.

How does A86 relate to ICF functioning codes?

ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like unspecified viral encephalitis affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.

What is the ICD-11 equivalent of A86?

A86 maps to the ICD-11 code: 1C80 (Viral encephalitis, not elsewhere classified).

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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.