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ICD-10-CM Current in FY 2027

A81.9

Atypical virus infection of central nervous system, unspecified

Release
FY 2027
Effective
Official source (opens in a new tab)

Hierarchy

Where A81.9 sits in the official hierarchy. Each level is the code it is classified under.

  1. A81 Parent Atypical virus infections of central nervous system
  2. A81.9 This code Atypical virus infection of central nervous system, unspecified

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

Includes

diseases of the central nervous system caused by prions

Inherited from A81 — Atypical virus infections of central nervous system

Inclusion Terms

Prion diseases of the central nervous system NOS

Use Additional Code

code, if applicable, to identify:

Inherited from A81 — Atypical virus infections of central nervous system

Use Additional Code

dementia with anxiety ( F02.84 , F02.A4 , F02.B4 , F02.C4 )

Inherited from A81 — Atypical virus infections of central nervous system

Use Additional Code

dementia with behavioral disturbance ( F02.81- , F02.A1- , F02.B1- , F02.C1- )

Inherited from A81 — Atypical virus infections of central nervous system

Use Additional Code

dementia with mood disturbance ( F02.83 , F02.A3 , F02.B3 , F02.C3 )

Inherited from A81 — Atypical virus infections of central nervous system

Use Additional Code

dementia with psychotic disturbance ( F02.82 , F02.A2 , F02.B2 , F02.C2 )

Inherited from A81 — Atypical virus infections of central nervous system

Use Additional Code

dementia without behavioral disturbance ( F02.80 , F02.A0 , F02.B0 , F02.C0 )

Inherited from A81 — Atypical virus infections of central nervous system

Use Additional Code

mild neurocognitive disorder due to known physiological condition ( F06.7- )

Inherited from A81 — Atypical virus infections of central nervous system

Version History

How A81.9 appears in each release imported from the official files, newest first.

  1. FY 2027 Effective

    Current

    Atypical virus infection of central nervous system, unspecified

  2. FY 2026 Effective

    Unchanged

    Atypical virus infection of central nervous system, unspecified

Related Codes

Other codes under A81

Codes whose official notes reference A81.9

Data Source

Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.

Release
FY 2027
Effective
Source file
icd10cm-code-descriptions-2027.zip

Official ICD-10-CM source files (opens in a new tab)

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