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Chapters ENES DE

XExtension Codes
Anatomy and topography
Functional anatomy
Nervous system
XA3JU6Central nervous system
XA9738Brain
XA8AT9Brainstem

XA34M4 category

Reticular formation

Also indexed as

Reticular formation

Nearby in Brainstem

XA17J6Medulla oblongata
XA5KS6Midbrain
XA9CM4Pons
XA5KN2Olives
XA5097Pyramid
XA1GA1Infratentorial region of brain

PreviousXA9CM4 — Pons NextXA5KN2 — Olives

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
Severity Scale Value
Temporality
Aetiology
Topology Scale Value
Anatomy and topography
Histopathology
Dimensions of injury
Dimensions of external causes
Consciousness
5 more
Functional anatomy
Surface topography
Partonomic view
Haematopoietic system
Immune system
Endocrine system
Nervous system
Visual system
Auditory system
Circulatory system
Respiratory system
Digestive system
3 more
XA3JU6Central nervous system
XA1630Peripheral nervous system
XA7718Autonomic nervous system
Nerve
XA0AK4Meninges
XA9738Brain
XA0V83Spinal cord
XA1M33Cerebrum
XA1CW2Cerebellum
XA8733Limbic system
XA26E8Cerebral ventricle
XA8AT9Brainstem
XA08F7Intracranial site, not elsewhere classified
XA17J6Medulla oblongata
XA5KS6Midbrain
XA9CM4Pons
XA34M4Reticular formation
XA5KN2Olives
XA5097Pyramid
XA1GA1Infratentorial region of brain

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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