Q04.3 ICD-10-CM Code: Other reduction deformities of brain
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
Q04.3Other reduction deformities of brain
ICD-10-CM diagnosis code · United States clinical modification
Where Q04.3 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 Q04.3
Other reduction deformities of brain
Notes for this code
Inclusion terms
- Absence of part of brain
- Agenesis of part of brain
- Agyria
- Aplasia of part of brain
- Hydranencephaly
- Hypoplasia of part of brain
- Lissencephaly
- Microgyria
- Pachygyria
Code first
No “code first” instruction is listed for Q04.3.
Use additional code
No “use additional code” instruction is listed for Q04.3.
Excludes1
Conditions that should not be reported together with this code.
- congenital malformations of corpus callosum (Q04.0)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Q04.3.
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 Q04.3 mean?
Q04.3 is the FY 2027 U.S. ICD-10-CM code for “Other reduction deformities of brain.”
Is Q04.3 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, Q04.3 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is Q04.3 located in ICD-10-CM?
Q04.3 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 Q04.3?
Its listed inclusion terms are Absence of part of brain; Agenesis of part of brain; Agyria; Aplasia of part of brain; Hydranencephaly; Hypoplasia of part of brain; Lissencephaly; Microgyria; Pachygyria. No code-first instruction is listed. Excludes1 notes: congenital malformations of corpus callosum (Q04.0). No Excludes2 note is listed.