Q04 ICD-10-CA category: Other congenital malformations of brain
Q04 isn’t a code on its own. Choose one of the 9 codes beneath it, the one the documentation supports.
Official description
Q04Other congenital malformations of brain
ICD-10-CA · Canada
Codes in Q04
Q04 isn’t a code on its own. Open the code that matches what the note documents.
Q04.0Congenital malformations of corpus callosumQ04.1ArhinencephalyQ04.2HoloprosencephalyQ04.3Other reduction deformities of brainQ04.4Septo-optic dysplasiaQ04.5MegalencephalyQ04.6Congenital cerebral cystsQ04.8Other specified congenital malformations of brainQ04.9Congenital malformation of brain, unspecifiedNotes for Q04
As CIHI prints them, with any note Q04 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Cyclopia (Q87.0)macrocephaly (Q75.3)
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q04 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q00-Q07Congenital malformations of the nervous system
- 3Category Q04Other congenital malformations of brain
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is Q04 a valid ICD-10-CA code?
No. Q04 (Other congenital malformations of brain) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 9 codes; record the one the documentation supports.
Where is Q04 in ICD-10-CA?
Q04 sits under Q00-Q07 Congenital malformations of the nervous system, within Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
What coding notes apply to Q04?
ICD-10-CA lists Excludes notes for Q04, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.