G91.4 – Hydrocephalus in diseases classified elsewhere

ICD-10-CM 2027 diagnosis code · Other disorders of the nervous system

Billable code

ICD-10-CM code G91.4
Code
G91.4 (claims format: G914)
Description
Hydrocephalus in diseases classified elsewhere
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
6. Diseases of the nervous system (G00-G99)
Block
G89-G99 Other disorders of the nervous system
Parent codes
G91

Notes for G91.4

Excludes1 (not coded here):
  • hydrocephalus due to congenital toxoplasmosis (P37.1)
Code first:
  • underlying condition, such as:
  • congenital syphilis (A50.4-)
  • neoplasm (C00-D49)
  • plasminogen deficiency (E88.02)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G91 – Hydrocephalus

Includes:
  • acquired hydrocephalus
Excludes1 (not coded here):
  • Arnold-Chiari syndrome with hydrocephalus (Q07.-)
  • congenital hydrocephalus (Q03.-)
  • spina bifida with hydrocephalus (Q05.-)

Index terms for G91.4

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in G91

Frequently asked questions

What is ICD-10 code G91.4?

G91.4 is the ICD-10-CM code for hydrocephalus in diseases classified elsewhere, in the block G89-G99 (Other disorders of the nervous system).

Is G91.4 a billable code?

Yes. G91.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G91.4 belong to?

It belongs to category G91 – Hydrocephalus.

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.