Is Q00 a billable ICD-10-CM code?

No. Q00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Q00 sit in the tabular list?

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of the nervous system (Q00-Q07).

Q00

Q00 — Anencephaly and similar malformations

Non-billable headerICD-10-CM

Q00 is a non-billable header ICD-10-CM code for anencephaly and similar malformations. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with Q00

These codes carry an Excludes1 note pointing at Q00. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q00 alone.

Q75Other congenital malformations of skull and face bones

Risk adjustment

Q00 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 Q00

3 child codes. Green means billable.

Questions about Q00

Is Q00 a billable ICD-10-CM code?: No. Q00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Q00 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of the nervous system (Q00-Q07).