Q04

Non-billable

Other congenital malformations of brain

Q04 is the ICD-10-CM code for Other congenital malformations of brain. It is a non-billable category code — use a more specific child code such as Q04.0 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Subcodes
9
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

What this means — in plain language

MedlinePlus · NIH

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. Parts of the brain may be missing, abnormally small or large, or not fully developed. Treatment depends upon the…

Read more about Brain Malformations at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

Frequently asked questions

What is ICD-10 code Q04?
Q04 is the ICD-10-CM code for "Other congenital malformations of brain". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q04 a billable code?
No — Q04 is a non-billable header code. Use a more specific child code (such as Q04.0) for billing.
What are the subcodes of Q04?
Q04 has 9 more specific child codes, including Q04.0, Q04.1, Q04.2.
What is excluded from Q04?
Excludes1 (not coded here): cyclopia (Q87.0); macrocephaly (Q75.3).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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