G91 is the ICD-10 code for Hydrocephalus. It is a three-character category divided into 6 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block G90–G99 (Other disorders of the nervous system) in Chapter VI, Diseases of the nervous system.
- Code type
- Category (3 characters)
- Chapter
- VI · G00–G99
- Classification
- WHO ICD-10, 2019 version
What G91 includes
Conditions and terms that are coded here.
- acquired hydrocephalus
What G91 excludes
Conditions that look similar but belong under another code.
Subcodes of G91
G91 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DG91Hydrocefalus
G91Vesipäisyys
G91Hydrozephalus
G91Hydrocéphalie
G91hydrocefalus
Listed through more specific codes:
- G91.4Hydrocephalus in diseases classified elsewhere
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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