Q04Header code — not billable
Other congenital malformations of brain
- Chapter
- 17. Congenital malformations, deformations and chromosomal abnormalities
- Category
- Q04
- Effective date
- October 1, 2026
Related codes in category Q04
Q04.0Congenital malformations of corpus callosumYesQ04.1ArhinencephalyYesQ04.2HoloprosencephalyYesQ04.3Other reduction deformities of brainYesQ04.4Septo-optic dysplasia of brainYesQ04.5MegalencephalyYesQ04.6Congenital cerebral cystsYesQ04.8Other specified congenital malformations of brainYesQ04.9Congenital malformation of brain, unspecifiedYes
Frequently asked questions
What is ICD-10 code Q04?
Q04 is an ICD-10-CM diagnosis code for Other congenital malformations of brain.
Is Q04 a billable code?
No. Q04 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is Q04 in?
Q04 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.
When did Q04 become effective?
Q04 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Q04?
Q04 belongs to category Q04, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.