Is A08 a billable ICD-10-CM code?

No. A08 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does A08 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Intestinal infectious diseases (A00-A09).

What cannot be coded together with A08?

A08 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

A08

A08 — Viral and other specified intestinal infections

Non-billable headerICD-10-CM

A08 is a non-billable header ICD-10-CM code for viral and other specified intestinal infections. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

influenza with involvement of gastrointestinal tract (J09.X3, J10.2, J11.2)

Other codes that can never be billed with A08

These codes carry an Excludes1 note pointing at A08. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A08 alone.

J09.X3Influenza due to identified novel influenza A virus with gastrointestinal manifestations
J10.2Influenza due to other identified influenza virus with gastrointestinal manifestations
J11.2Influenza due to unidentified influenza virus with gastrointestinal manifestations

Risk adjustment

A08 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 A08

6 child codes. Green means billable.

Questions about A08

Is A08 a billable ICD-10-CM code?: No. A08 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does A08 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Intestinal infectious diseases (A00-A09).
What cannot be coded together with A08?: A08 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.