A81
Non-billableAtypical virus infections of central nervous system
A81 is the ICD-10-CM code for Atypical virus infections of central nervous system. It is a non-billable category code — use a more specific child code such as A81.0 for billing.
- Status
- Header (non-billable)
- Chapter
- A00-B99
- Subcodes
- 5
- Edition
- FY2026
A00-B99 Certain infectious and parasitic diseases
Includes
- •diseases of the central nervous system caused by prions
Use additional code
- •code, if applicable, to identify:
- •dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
- •dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
- •dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
- •dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
- •dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
- •mild neurocognitive disorder due to known physiological condition (F06.7-)
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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