A85.1
BillableAdenoviral encephalitis
Adenoviral encephalitis
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Adenoviral meningoencephalitis
Includes
Conditions included under this code
- diseases generally recognized as communicable or transmissible
- specified viral encephalomyelitis NEC
- specified viral meningoencephalitis NEC
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- certain localized infections - see body system-related chapters
- •postpolio syndromeG14
- •sequelae of poliomyelitisB91
- •sequelae of viral encephalitisB94.1
- •encephalitis due to cytomegalovirusB25.8
- •encephalitis due to herpesvirus NECB10.0
- •encephalitis due to herpesvirus [herpes simplex]B00.4
- •encephalitis due to measles virusB05.0
- •encephalitis due to mumps virusB26.2
- •encephalitis due to poliomyelitis virusA80
- •encephalitis due to zosterB02.0
- •lymphocytic choriomeningitisA87.2
- •myalgic encephalomyelitisG93.32
Excludes 2
Conditions not included here, but the patient may have both
Use Additional Code
Additional codes that should follow this code
Related Codes(3)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(52)
SNOMED CT
- Acute adenoviral encephalitis35640008
- Adenoviral encephalitis56529007
- Acute adenoviral meningoencephalitis82547005
- Acute meningoencephalitis caused by Adenovirus82547005
- Adenoviral meningitis111850006
- Meningitis caused by Adenovirus111850006
- Meningitis due to adenovirus111850006
- Subacute adenoviral encephalitis111851005
- Acute inclusion body encephalitis230161000
- Acute viral encephalitis230161000
- Encephalitis with AIDS (acquired immunodeficiency syndrome)420244003
- Encephalitis with acquired immunodeficiency syndrome420244003
- Subacute adenoviral encephalitis with AIDS (acquired immunodeficiency syndrome)421415007
- Subacute adenoviral encephalitis with acquired immunodeficiency syndrome421415007
- Encephalopathy with AIDS (acquired immunodeficiency syndrome)421827003
- Encephalopathy with acquired immunodeficiency syndrome421827003
- Subacute adenoviral encephalitis co-occurrent with human immunodeficiency virus infection713260006
- Adenoviral nervous system infection1163532007
- Nervous system infection caused by Adenovirus1163532007
- Acute encephalitis822021000000103
- Acute meningitis822031000000101
- Meningoencephalitis caused by virus430051000124107
- Viral meningoencephalitis430051000124107
UMLS
Clinical Terms
- Viral meningoencephalitis
- Acute viral encephalitis
- Nervous system infection caused by Adenovirus
- Subacute adenoviral encephalitis with acquired immunodeficiency syndrome
- Meningoencephalitis adenoviral
- Adenoviral meningoencephalitis
- Acute inclusion body encephalitis
- Subacute adenoviral encephalitis co-occurrent with human immunodeficiency virus infection
- Meningoencephalitis caused by virus
- Acute adenoviral encephalitis
- Subacute adenoviral encephalitis
- Encephalitis with acquired immunodeficiency syndrome
- Encephalopathy with acquired immunodeficiency syndrome
- Encephalopathy with AIDS (acquired immunodeficiency syndrome)
- Meningitis due to adenovirus
- Acute meningitis
- Adenoviral encephalitis (disorder)
- Encephalitis with AIDS (acquired immunodeficiency syndrome)
- Subacute adenoviral encephalitis with AIDS (acquired immunodeficiency syndrome)
- Acute meningoencephalitis caused by Adenovirus
- Acute adenoviral meningoencephalitis
- Acute encephalitis
- Adenoviral nervous system infection
- Meningitis caused by Adenovirus
- Adenoviral meningitis
Frequently Asked Questions
What is the ICD-10 code for adenoviral encephalitis?
The ICD-10-CM code for adenoviral encephalitis is A85.1. The full clinical description is "Adenoviral encephalitis". A85.1 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code A85.1 mean?
ICD-10-CM code A85.1 represents “Adenoviral 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 A85.1 a billable code?
Yes, A85.1 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is A85.1 in?
A85.1 is in Chapter 1: Certain Infectious and Parasitic Diseases (codes A00-B99).
What codes cannot be used with A85.1?
A85.1 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 10 more.
Are additional codes required with A85.1?
Yes, when using A85.1, also report: resistance to antimicrobial drugs (Z16.-).
What SNOMED CT codes does A85.1 map to?
A85.1 maps to 14 SNOMED CT concepts: 35640008, 82547005, 822021000000103, 230161000, 822031000000101, and 9 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for A85.1?
A85.1 is linked to 2 UMLS Concept Unique Identifiers: C0276157, C0853861. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does A85.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like adenoviral 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 A85.1?
A85.1 maps to the ICD-11 code: 1C80 (Viral encephalitis, not elsewhere classified).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
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.