2026 ICD-10-CM Diagnosis Code Q04Other congenital malformations of brain

ICD-10-CM Codes›Q00-Q99›Q00-Q07›Q04

ICD-10-CM Q04
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q04 is a non-billable ICD-10-CM category code for other congenital malformations of brain, so it cannot be submitted on claims. Use a more specific code from this category instead, such as Q04.0, Q04.1, Q04.2, and Q04.3.

Code Identity

ICD-10-CM Code
Q04
Billable Status
No — Non-Billable Category
Code Describes
Other congenital malformations of brain
Chapter
Q00-Q07
Congenital malformations of the nervous system

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ00-Q07Congenital malformations of the nervous system
CategoryQ04Other congenital malformations of brain
This CodeQ04Other congenital malformations of brain

Specific Coding for Other congenital malformations of brainOverview

Non-specific codes like Q04 require more characters. Use one of these billable codes instead:

  • Use Q04.0 for Congenital malformations of corpus callosum

  • Use Q04.1 for Arhinencephaly

  • Use Q04.2 for Holoprosencephaly

  • Use Q04.3 for Other reduction deformities of brain

  • Use Q04.4 for Septo-optic dysplasia of brain

  • Use Q04.5 for Megalencephaly

  • Use Q04.6 for Congenital cerebral cysts

  • Use Q04.8 for Other specified congenital malformations of brain

  • Use Q04.9 for Congenital malformation of brain, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

Patient EducationClinical

Brain Malformations

Most brain malformations begin long before a baby is born. Something damages the developing nervous system or causes it to develop abnormally. Sometimes it's a genetic problem. In other cases, exposure to certain medicines, infections, or radiation during pregnancy interferes with brain development.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q04Overview

Is Q04 (Other congenital malformations of brain) a billable code?

No. This is a category header that groups the codes for other congenital malformations of brain, and headers cannot be submitted on claims. Claims for other congenital malformations of brain need a more specific code from this category, such as Q04.0, Q04.1, and Q04.2.