Is G91 a billable code?
No. G91 is a header code that groups 7 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
G91: Hydrocephalus
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
G91 groups related diagnoses under hydrocephalus. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
G91 questions
What does G91 mean?
G91 is the ICD-10-CM code for Hydrocephalus. It is in chapter 6, Diseases of the nervous system (G00-G99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.