Is A99 a billable ICD-10-CM code?

Yes. A99 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does A99 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99).

A99

A99 — Unspecified viral hemorrhagic fever

Billable / specific codeICD-10-CM

A99 is a billable, specific ICD-10-CM code for unspecified viral hemorrhagic fever. It is valid for submission on a claim.

Risk adjustment

A99 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.

How A99 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 A99.

Fever›hemorrhagic NOS›viral

Questions about A99

Is A99 a billable ICD-10-CM code?: Yes. A99 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does A99 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99).