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
These codes carry an Excludes1 note pointing at A81. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A81 alone.
- B05Measles
Risk adjustment
A81 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead A81
5 child codes. Green means billable.
Questions about A81
- Is A81 a billable ICD-10-CM code?
- No. A81 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does A81 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Viral and prion infections of the central nervous system (A80-A89).