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Q03

Non-billable

Congenital hydrocephalus

Q03 is the ICD-10-CM code for Congenital hydrocephalus. It is a non-billable category code — use a more specific child code such as Q03.0 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Subcodes
4
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

What this means — in plain language

MedlinePlus · NIH

Hydrocephalus is the buildup of too much cerebrospinal fluid in the brain. Normally, this fluid cushions your brain. When you have too much, though, it puts harmful pressure on your brain. Hydrocephalus can be congenital, or present at birth. Causes include genetic problems and problems with how the fetus develops. An unusually large head is the main sign of congenital hydrocephalus. Hydrocephalus can also happen…

Read more about Hydrocephalus at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

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". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q03 a billable code?
No — Q03 is a non-billable header code. Use a more specific child code (such as Q03.0) for billing.
What are the subcodes of Q03?
Q03 has 4 more specific child codes, including Q03.0, Q03.1, Q03.8.
What is excluded from Q03?
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).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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