A81.9 - Atypical virus infection of central nervous system, unspecified
- Applicable to Atypical virus infection of central nervous system, unspecified
- The 2025 edition of ICD10-CM A81.9 became effective on October 1, 2024.
- This is the American ICD10-CM version of A81.9 - other international versions of ICD10 A81.9 may differ.
- A81.9 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Inclusion terms help to clarify and specify the conditions or diseases covered by a particular ICD-10-CM code.
Inclusion Term:
- Prion diseases of the central nervous system NOS
Billable/Specific Code
The following codes above A81.9 contain annotation back-references that may be applicable to A81.9:
- Chapter: A00-B99 - Certain infectious and parasitic diseases
- Section: A80-A89 - Viral and prion infections of the central nervous system
- Category: A81 - Atypical virus infections of central nervous system
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Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
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