G91.2 – (Idiopathic) normal pressure hydrocephalus

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

Billable code

ICD-10-CM code G91.2

Code: G91.2 (claims format: G912)
Description: (Idiopathic) normal pressure hydrocephalus
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 G91.2

Applicable to:

Normal pressure hydrocephalus NOS

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 G91.2

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

Hydrocephalus, normal pressure

Related codes in G91

G91.0 – Communicating hydrocephalusBillable
G91.1 – Obstructive hydrocephalusBillable
G91.3 – Post-traumatic hydrocephalus, unspecifiedBillable
G91.4 – Hydrocephalus in diseases classified elsewhereBillable
G91.8 – Other hydrocephalusBillable
G91.9 – Hydrocephalus, unspecifiedBillable

Frequently asked questions

What is ICD-10 code G91.2?

G91.2 is the ICD-10-CM code for (Idiopathic) normal pressure hydrocephalus, in the block G89-G99 (Other disorders of the nervous system).

Is G91.2 a billable code?

Yes. G91.2 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G91.2 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.