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Chapters ENES DE

08Diseases of the nervous system
Disorders of cerebrospinal fluid pressure or flow
8D64Hydrocephalus
8D64.0Communicating hydrocephalus

8D64.01 category

Congenital agenesis of arachnoid villi

Also indexed as

Congenital agenesis of arachnoid villi

Nearby in Communicating hydrocephalus

8D64.00Increased cerebrospinal fluid production
8D64.02Post haemorrhagic hydrocephalus
8D64.03Post traumatic hydrocephalus
8D64.04Normal-pressure hydrocephalus
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

Previous8D64.00 — Increased cerebrospinal fluid production Next8D64.02 — Post haemorrhagic hydrocephalus

Browse ICD-11

01Certain infectious or parasitic diseases
02Neoplasms
03Diseases of the blood or blood-forming organs
04Diseases of the immune system
05Endocrine, nutritional or metabolic diseases
06Mental, behavioural or neurodevelopmental disorders
07Sleep-wake disorders
08Diseases of the nervous system
09Diseases of the visual system
10Diseases of the ear or mastoid process
11Diseases of the circulatory system
12Diseases of the respiratory system
13Diseases of the digestive system
14Diseases of the skin
15Diseases of the musculoskeletal system or connective tissue
16Diseases of the genitourinary system
17Conditions related to sexual health
18Pregnancy, childbirth or the puerperium
19Certain conditions originating in the perinatal period
20Developmental anomalies
21Symptoms, signs or clinical findings, not elsewhere classified
22Injury, poisoning or certain other consequences of external causes
23External causes of morbidity or mortality
24Factors influencing health status or contact with health services
25Codes for special purposes
26Supplementary Chapter Traditional Medicine Conditions
VSupplementary section for functioning assessment
XExtension Codes
8B80-8C4ZDisorders of nerve root, plexus or peripheral nerves
8C60-8D0ZDiseases of neuromuscular junction or muscle
8D20-8D2ZCerebral palsy
8D40-8D4ZNutritional or toxic disorders of the nervous system
8D60-8D6ZDisorders of cerebrospinal fluid pressure or flow
8D80-8D8ZDisorders of autonomic nervous system
8E00-8E0ZHuman prion diseases
8E20-8E2ZDisorders of consciousness
8E40-8E4A.ZCertain disorders of the nervous system
13 more
8D60Increased intracranial pressure
8D61Intracranial hypotension
8D62Cerebrospinal fluid rhinorrhoea
8D63Cerebrospinal fluid otorrhoea
8D64Hydrocephalus
8D65Cerebrospinal fluid fistula
8D66Syringomyelia or syringobulbia
8D67Intracranial arachnoid cyst
8D68Porencephalic cyst
2 more
8D64.0Communicating hydrocephalus
8D64.1Non-communicating hydrocephalus
8D64.2Ex-vacuo hydrocephalus
4B4ZDiseases of the immune system, unspecified
8D64.00Increased cerebrospinal fluid production
8D64.01Congenital agenesis of arachnoid villi
8D64.02Post haemorrhagic hydrocephalus
8D64.03Post traumatic hydrocephalus
8D64.04Normal-pressure hydrocephalus
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

International Classification of Diseases, Eleventh Revision (ICD-11), World Health Organization (WHO) 2019/2021, https://icd.who.int/browse11. Licensed under Creative Commons Attribution-NoDerivatives 3.0 IGO (CC BY-ND 3.0 IGO).

Release 2026-01. View this entity in the official WHO ICD-11 browser.

This page reproduces WHO classification content for reference. It is not medical advice and must not be used to diagnose or treat. For coding decisions, consult the official release and your national coding guidelines.

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