Q04
Other congenital malformations of brain
Q04 is a non-billable ICD-10-CM code category for other congenital malformations of brain. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Q04.0 Congenital malformations of corpus callosum, Q04.1 Arhinencephaly, Q04.2 Holoprosencephaly, Q04.3 Other reduction deformities of brain and 5 more. Its coding notes include 2 Excludes1 entries and 1 Excludes2 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
More specific codes under Q04 9
- Q04.0Congenital malformations of corpus callosumBillable
- Q04.1ArhinencephalyBillable
- Q04.2HoloprosencephalyBillable
- Q04.3Other reduction deformities of brainBillable
- Q04.4Septo-optic dysplasia of brainBillable
- Q04.5MegalencephalyBillable
- Q04.6Congenital cerebral cystsBillable
- Q04.8Other specified congenital malformations of brainBillable
- Q04.9Congenital malformation of brain, unspecifiedBillable