ICD-10-CM · Chapter 17 · Q00-QA1
Q04 Other congenital malformations of brain
Excludes 1 (cannot be coded together)
- cyclopia (Q87.0)
- macrocephaly (Q75.3)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Q04..0 | Congenital malformations of corpus callosum | Yes |
| Q04..1 | Arhinencephaly | Yes |
| Q04..2 | Holoprosencephaly | Yes |
| Q04..3 | Other reduction deformities of brain | Yes |
| Q04..4 | Septo-optic dysplasia of brain | Yes |
| Q04..5 | Megalencephaly | Yes |
| Q04..6 | Congenital cerebral cysts | Yes |
| Q04..8 | Other specified congenital malformations of brain | Yes |
| Q04..9 | Congenital malformation of brain, unspecified | Yes |
Last reviewed: September 2026