ICD-10-CM Code A81.9

Valid for Submission

A81.9 is a billable code used to specify a medical diagnosis of atypical virus infection of central nervous system, unspecified. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code A81.9 might also be used to specify conditions or terms like acquired prion disease, dementia due to infectious disease, dementia due to prion disease, familial alzheimer-like prion disease, prion disease, slow viral central nervous system infection, etc

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 A81.9:

Inclusion Terms

Inclusion Terms
These 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.

• Prion diseases of the central nervous system 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 A81.9 are found in the index:

• - Disease, diseased - See Also: Syndrome;
  • - prion, central nervous system - A81.9

• - Infection, infected, infective (opportunistic) - B99.9
  • - atypical
    • - virus - A81.9
  • - slow virus - A81.9
  • - virus, viral NOS - B34.9
    • - central nervous system - A89
      • - atypical - A81.9
      • - slow virus - A81.9
    • - slow - A81.9

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

• Acquired prion disease
• Dementia due to infectious disease
• Dementia due to prion disease
• Familial Alzheimer-like prion disease
• Prion disease
• Slow viral central nervous system infection

Convert A81.9 to ICD-9

• 046.9 - Cns slow virus infec NOS

Code Classification

• Certain infectious and parasitic diseases (A00–B99)
  • Viral and prion infections of the central nervous system (A80-A89)
    • Atypical virus infections of central nervous system (A81)

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
• FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

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