Is A83 a billable ICD-10-CM code?

No. A83 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does A83 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).

A83

A83 — Mosquito-borne viral encephalitis

Non-billable headerICD-10-CM

A83 is a non-billable header ICD-10-CM code for mosquito-borne viral encephalitis. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

Venezuelan equine encephalitis (A92.2)
West Nile fever (A92.3-)
West Nile virus (A92.3-)

Includes

Conditions this code covers.

mosquito-borne viral meningoencephalitis

Risk adjustment

A83 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 A83

9 child codes. Green means billable.

Questions about A83

Is A83 a billable ICD-10-CM code?: No. A83 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does A83 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).