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G91

Non-billable

Hydrocephalus

G91 is the ICD-10-CM code for Hydrocephalus. It is a non-billable category code — use a more specific child code such as G91.0 for billing.

Status
Header (non-billable)
Chapter
G00-G99
Subcodes
7
Edition
FY2026

G00-G99 Diseases of the nervous system

Includes

  • •acquired hydrocephalus

Excludes1 — not coded here

  • •Arnold-Chiari syndrome with hydrocephalus (Q07.-)
  • •congenital hydrocephalus (Q03.-)
  • •spina bifida with hydrocephalus (Q05.-)

Frequently asked questions

What is ICD-10 code G91?
G91 is the ICD-10-CM code for "Hydrocephalus". It falls under G00-G99 Diseases of the nervous system.
Is G91 a billable code?
No — G91 is a non-billable header code. Use a more specific child code (such as G91.0) for billing.
What are the subcodes of G91?
G91 has 7 more specific child codes, including G91.0, G91.1, G91.2.
What is excluded from G91?
Excludes1 (not coded here): Arnold-Chiari syndrome with hydrocephalus (Q07.-); congenital hydrocephalus (Q03.-); spina bifida with hydrocephalus (Q05.-).

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

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