Q04: Other congenital malformations of brain
Codes under Q04 (Other congenital malformations of brain). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| Q04.0 | Congenital malformations of corpus callosum | ✓ |
| Q04.0 | Congenital malformations of corpus callosum | ✓ |
| Q04.1 | Arhinencephaly | ✓ |
| Q04.1 | Arhinencephaly | ✓ |
| Q04.2 | Holoprosencephaly | ✓ |
| Q04.2 | Holoprosencephaly | ✓ |
| Q04.3 | Other reduction deformities of brain | ✓ |
| Q04.3 | Other reduction deformities of brain | ✓ |
| Q04.4 | Septo-optic dysplasia of brain | ✓ |
| Q04.4 | Septo-optic dysplasia of brain | ✓ |
| Q04.5 | Megalencephaly | ✓ |
| Q04.5 | Megalencephaly | ✓ |
| Q04.6 | Congenital cerebral cysts | ✓ |
| Q04.6 | Congenital cerebral cysts | ✓ |
| Q04.8 | Other specified congenital malformations of brain | ✓ |
| Q04.8 | Other specified congenital malformations of brain | ✓ |
| Q04.9 | Congenital malformation of brain, unspecified | ✓ |
| Q04.9 | Congenital malformation of brain, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code Q04?
Q04 is an ICD-10-CM category covering Other congenital malformations of brain. It contains 18 more specific diagnosis codes, 18 of which are billable.
Is Q04 a billable code?
No — Q04 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example Q04.0 — Congenital malformations of corpus callosum). 18 of the 18 codes under Q04 are billable.
What codes fall under Q04?
Q04 includes Q04.0, Q04.0, Q04.1, Q04.1, Q04.2, plus 13 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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