Is A84.81 a billable ICD-10-CM code?

Yes. A84.81 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does A84.81 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).

A84.81

A84.81 — Powassan virus disease

Billable / specific codeICD-10-CM

A84.81 is a billable, specific ICD-10-CM code for powassan virus disease. It is valid for submission on a claim.

Risk adjustment

A84.81 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.

Medicare coverage

A84.81 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
A57204Billing and Coding: MRI and CT Scans of the Head and Neck

How A84.81 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to A84.81.

Encephalitis›Powassan
Disease, diseased›viral, virus›Powassan

Related codes at this level

Codes that share A84.8. If A84.81 is not quite right, the correct code is usually one of these.

A84.89Other tick-borne viral encephalitis

Questions about A84.81

Is A84.81 a billable ICD-10-CM code?: Yes. A84.81 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does A84.81 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).