Is Q04 a billable ICD-10-CM code?

No. Q04 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Q04 sit in the tabular list?

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

What cannot be coded together with Q04?

Q04 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

Q04

Q04 — Other congenital malformations of brain

Non-billable headerICD-10-CM

Q04 is a non-billable header ICD-10-CM code for other congenital malformations of brain. 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.

cyclopia (Q87.0)
macrocephaly (Q75.3)

Other codes that can never be billed with Q04

These codes carry an Excludes1 note pointing at Q04. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q04 alone.

Q04.3Other reduction deformities of brain
Q07.0Arnold-Chiari syndrome
G93.0Cerebral cysts

Risk adjustment

Q04 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 Q04

9 child codes. Green means billable.

Questions about Q04

Is Q04 a billable ICD-10-CM code?: No. Q04 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Q04 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of the nervous system (Q00-Q07).
What cannot be coded together with Q04?: Q04 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.