Q03Header code — not billable

Congenital hydrocephalus

Chapter
17. Congenital malformations, deformations and chromosomal abnormalities
Category
Q03
Effective date
October 1, 2026

Related codes in category Q03

Q03.0Malformations of aqueduct of SylviusYesQ03.1Atresia of foramina of Magendie and LuschkaYesQ03.8Other congenital hydrocephalusYesQ03.9Congenital hydrocephalus, unspecifiedYes

Frequently asked questions

What is ICD-10 code Q03?

Q03 is an ICD-10-CM diagnosis code for Congenital hydrocephalus.

Is Q03 a billable code?

No. Q03 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is Q03 in?

Q03 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.

When did Q03 become effective?

Q03 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to Q03?

Q03 belongs to category Q03, which includes 4 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.