Is A88 a billable ICD-10-CM code?

No. A88 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does A88 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).

What cannot be coded together with A88?

A88 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

A88

A88 — Other viral infections of central nervous system, not elsewhere classified

Non-billable headerICD-10-CM

A88 is a non-billable header ICD-10-CM code for other viral infections of central nervous system, not elsewhere classified. 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.

viral encephalitis NOS (A86)
viral meningitis NOS (A87.9)

Other codes that can never be billed with A88

These codes carry an Excludes1 note pointing at A88. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A88 alone.

H81Disorders of vestibular function
H82Vertiginous syndromes in diseases classified elsewhere

Risk adjustment

A88 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 A88

3 child codes. Green means billable.

Questions about A88

Is A88 a billable ICD-10-CM code?: No. A88 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does A88 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).
What cannot be coded together with A88?: A88 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.