G91.8 – Other hydrocephalus
ICD-10-CM 2027 diagnosis code · Other disorders of the nervous system
ICD-10-CM code
G91.8
- Code
G91.8(claims format:G918)- Description
- Other 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 inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G91 – Hydrocephalus
Includes:
- acquired hydrocephalus
Index terms for G91.8
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G91
- G91.0 – Communicating hydrocephalusBillable
- G91.1 – Obstructive hydrocephalusBillable
- G91.2 – (Idiopathic) normal pressure hydrocephalusBillable
- G91.3 – Post-traumatic hydrocephalus, unspecifiedBillable
- G91.4 – Hydrocephalus in diseases classified elsewhereBillable
- G91.9 – Hydrocephalus, unspecifiedBillable
Frequently asked questions
What is ICD-10 code G91.8?
G91.8 is the ICD-10-CM code for other hydrocephalus, in the block G89-G99 (Other disorders of the nervous system).
Is G91.8 a billable code?
Yes. G91.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G91.8 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.