A81
Non-billableAtypical virus infections of central nervous system
Atypical virus infections of central nervous system
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Status
Non-billable / Header
Block
A80-A89
Child Codes
5
Coding Notes
Includes
Conditions included under this code
- diseases generally recognized as communicable or transmissible
- diseases of the central nervous system caused by prions
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
- code to identify resistance to antimicrobial drugs (Z16.-)
- code, if applicable, to identify:
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
- mild neurocognitive disorder due to known physiological condition (F06.7-)
Child Codes (5)
Also Known As / Clinical Terms
Frequently Asked Questions
What is ICD-10 code A81?
ICD-10-CM code A81 represents "Atypical virus infections of central nervous system". It is a non-billable header code — use a more specific child code for billing purposes.
Is A81 a billable code?
No, A81 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 5 child codes under A81.
What chapter is A81 in?
A81 is in Chapter 1: Certain Infectious and Parasitic Diseases (codes A00-B99).
What codes cannot be used with A81?
A81 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.
What are the subcategories under A81?
A81 has 5 child codes, including: A81.0 (Creutzfeldt-Jakob disease), A81.1 (Subacute sclerosing panencephalitis), A81.2 (Progressive multifocal leukoencephalopathy), A81.8 (Other atypical virus infections of central nervous system), and 1 more.
Are additional codes required with A81?
Yes, when using A81 you should also code: code to identify resistance to antimicrobial drugs (Z16.-); code, if applicable, to identify:; dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4); dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-); dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3); dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2); dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0); mild neurocognitive disorder due to known physiological condition (F06.7-).
What are the UMLS CUIs for A81?
A81 is linked to 2 UMLS Concept Unique Identifiers: C0851226, C4290047. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
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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.