A81

A81: Atypical virus infections of central nervous system

Non-billable headerICD-10-CM

A81 is a non-billable header ICD-10-CM code for atypical virus infections of central nervous system. It cannot be billed on its own: choose one of the more specific child codes below.

Use additional code

Add a secondary code to capture the detail described below.

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-)

Includes

Conditions this code covers.

diseases of the central nervous system caused by prions

Other codes that can never be billed with A81

Their own Excludes1 notes name this code, so the conflict is not listed above.

B05Measles

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead A81

5 child codes. Green means billable.