Q03 – Congenital hydrocephalus

ICD-10-CM 2027 diagnosis code · Congenital malformations of the nervous system

Non-billable header

ICD-10-CM code Q03
Code
Q03 (claims format: Q03)
Description
Congenital hydrocephalus
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 Q03

Q03 is a header code and cannot be used on claims. Choose the most specific code:

Notes for Q03

Includes:
  • hydrocephalus in newborn
Excludes1 (not coded here):
  • Arnold-Chiari syndrome, type II (Q07.0-)
  • acquired hydrocephalus (G91.-)
  • hydrocephalus due to congenital toxoplasmosis (P37.1)
  • hydrocephalus with spina bifida (Q05.0-Q05.4)

Frequently asked questions

What is ICD-10 code Q03?

Q03 is the ICD-10-CM code for congenital hydrocephalus, in the block Q00-Q07 (Congenital malformations of the nervous system).

Is Q03 a billable code?

No. Q03 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.