Q04 ICD-10-CM Code: Other congenital malformations of brain
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
Q04Other congenital malformations of brain
ICD-10-CM diagnosis code · United States clinical modification
Where Q04 sits
- 1
Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- 2
Section
Congenital malformations of the nervous system (Q00-Q07)
- 3
Category Q04
Other congenital malformations of brain
- 4
Code Q04
Other congenital malformations of brain
Codes under Q04
Q04 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Q04.0Congenital malformations of corpus callosumQ04.1ArhinencephalyQ04.2HoloprosencephalyQ04.3Other reduction deformities of brainQ04.4Septo-optic dysplasia of brainQ04.5MegalencephalyQ04.6Congenital cerebral cystsQ04.8Other specified congenital malformations of brainQ04.9Congenital malformation of brain, unspecifiedNotes for this code
Inclusion terms
No inclusion terms are listed for Q04.
Code first
No “code first” instruction is listed for Q04.
Use additional code
No “use additional code” instruction is listed for Q04.
Excludes1
Conditions that should not be reported together with this code.
- cyclopia (Q87.0)
- macrocephaly (Q75.3)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Q04.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code Q04 mean?
Q04 is the FY 2027 U.S. ICD-10-CM code for “Other congenital malformations of brain.”
Is Q04 a billable or specific ICD-10-CM code?
No. Q04 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Q04 located in ICD-10-CM?
Q04 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Congenital malformations of the nervous system (Q00-Q07) (Q00–Q07), under category Q04, Other congenital malformations of brain.
What coding notes are listed for Q04?
No inclusion terms are listed for Q04 in this reference record. No code-first instruction is listed. Excludes1 notes: cyclopia (Q87.0); macrocephaly (Q75.3). No Excludes2 note is listed.