Q04 – Other congenital malformations of brain
ICD-10-CM 2027 diagnosis code · Congenital malformations of the nervous system
ICD-10-CM code
Q04
- Code
Q04(claims format:Q04)- Description
- Other congenital malformations of brain
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- Block
- Q00-Q07 Congenital malformations of the nervous system
Billable codes under Q04
Q04 is a header code and cannot be used on claims. Choose the most specific code:
- Q04.0 – Congenital malformations of corpus callosumBillable
- Q04.1 – ArhinencephalyBillable
- Q04.2 – HoloprosencephalyBillable
- Q04.3 – Other reduction deformities of brainBillable
- Q04.4 – Septo-optic dysplasia of brainBillable
- Q04.5 – MegalencephalyBillable
- Q04.6 – Congenital cerebral cystsBillable
- Q04.8 – Other specified congenital malformations of brainBillable
- Q04.9 – Congenital malformation of brain, unspecifiedBillable
Notes for Q04
Frequently asked questions
What is ICD-10 code Q04?
Q04 is the ICD-10-CM code for other congenital malformations of brain, in the block Q00-Q07 (Congenital malformations of the nervous system).
Is Q04 a billable code?
No. Q04 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.