ICD-10-CM · Chapter 1 · A00–B99
A81.9
Atypical virus infection of central nervous system, unspecified
Certain infectious and parasitic diseases
Quick facts
- Code
- A81.9
- Type
- Billable code
- ICD-10-CM chapter
- Chapter 1 — Certain infectious and parasitic diseases
- Category
- A81 — Atypical virus infections of central nervous system
- Specificity
- 4 characters
How coders use this code
ICD-10-CM A81.9 is a billable, fully specified code, so it can be reported directly on a claim to document a diagnosis of atypical virus infection of central nervous system, unspecified. Coders assign it when the chart documentation supports this level of detail, always matching to the most specific code available and verifying against the chapter-specific guidelines published annually by NCHS/CMS.
Related codes in A81
- A81Atypical virus infections of central nervous system
- A81.0Creutzfeldt-Jakob disease
- A81.00Creutzfeldt-Jakob disease, unspecified
- A81.01Variant Creutzfeldt-Jakob disease
- A81.09Other Creutzfeldt-Jakob disease
- A81.1Subacute sclerosing panencephalitis
- A81.2Progressive multifocal leukoencephalopathy
- A81.8Other atypical virus infections of central nervous system
- A81.81Kuru
- A81.82Gerstmann-Straussler-Scheinker syndrome
- A81.83Fatal familial insomnia
- A81.89Other atypical virus infections of central nervous system
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