A81: Atypical virus infections of central nervous system
Codes under A81 (Atypical virus infections of central nervous system). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| A81.0 | Creutzfeldt-Jakob disease | — |
| A81.0 | Creutzfeldt-Jakob disease | — |
| A81.00 | Creutzfeldt-Jakob disease, unspecified | ✓ |
| A81.00 | Creutzfeldt-Jakob disease, unspecified | ✓ |
| A81.01 | Variant Creutzfeldt-Jakob disease | ✓ |
| A81.01 | Variant Creutzfeldt-Jakob disease | ✓ |
| A81.1 | Subacute sclerosing panencephalitis | ✓ |
| A81.1 | Subacute sclerosing panencephalitis | ✓ |
| A81.2 | Progressive multifocal leukoencephalopathy | ✓ |
| A81.2 | Progressive multifocal leukoencephalopathy | ✓ |
| A81.8 | Other atypical virus infections of central nervous system | — |
| A81.8 | Other atypical virus infections of central nervous system | — |
| A81.09 | Other Creutzfeldt-Jakob disease | ✓ |
| A81.09 | Other Creutzfeldt-Jakob disease | ✓ |
| A81.9 | Atypical virus infection of central nervous system, unspecified | ✓ |
| A81.9 | Atypical virus infection of central nervous system, unspecified | ✓ |
| A81.81 | Kuru | ✓ |
| A81.81 | Kuru | ✓ |
| A81.82 | Gerstmann-Straussler-Scheinker syndrome | ✓ |
| A81.82 | Gerstmann-Straussler-Scheinker syndrome | ✓ |
| A81.83 | Fatal familial insomnia | ✓ |
| A81.83 | Fatal familial insomnia | ✓ |
| A81.89 | Other atypical virus infections of central nervous system | ✓ |
| A81.89 | Other atypical virus infections of central nervous system | ✓ |
Frequently asked questions
What is ICD-10-CM code A81?
A81 is an ICD-10-CM category covering Atypical virus infections of central nervous system. It contains 24 more specific diagnosis codes, 20 of which are billable.
Is A81 a billable code?
No — A81 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example A81.0 — Creutzfeldt-Jakob disease). 20 of the 24 codes under A81 are billable.
What codes fall under A81?
A81 includes A81.0, A81.0, A81.00, A81.00, A81.01, plus 19 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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