Q04.8 – Other specified congenital malformations of brain
ICD-10-CM 2027 diagnosis code · Congenital malformations of the nervous system
ICD-10-CM code
Q04.8
- Code
Q04.8(claims format:Q048)- Description
- Other specified congenital malformations of brain
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
- Parent codes
- Q04
Notes for Q04.8
Applicable to:
- Arnold-Chiari syndrome, type IV
- Macrogyria
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Q04 – Other congenital malformations of brain
Index terms for Q04.8
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Ulegyria
- Macrogyria
- Distortion, gyri
- Ectopic, ectopia, brain
- Ectopic, ectopia, cerebral
- Softening, brain, congenital
- Heterotopia, heterotopic, cerebralis
- Malposition, congenital, brain tissue
- Anomaly, anomalous, meninges, cerebral
- Malformation, brain, specified type NEC
- Deformity, meninges or membrane, cerebral
- Displacement, displaced, brain stem, caudal
- Displacement, displaced, cerebellum, caudal
- Malformation, meninges or membrane, cerebral
- Arnold-Chiari disease, obstruction or syndrome, type IV
- Dilatation, ventricular, ventricle, cerebral, congenital
Related codes in Q04
- 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
- Q04.9 – Congenital malformation of brain, unspecifiedBillable
Frequently asked questions
What is ICD-10 code Q04.8?
Q04.8 is the ICD-10-CM code for other specified congenital malformations of brain, in the block Q00-Q07 (Congenital malformations of the nervous system).
Is Q04.8 a billable code?
Yes. Q04.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does Q04.8 belong to?
It belongs to category Q04 – Other congenital malformations of brain.
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.