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Chapters ENES DE

XExtension Codes
Anatomy and topography
Functional anatomy
Auditory system
XA01U5Ear
XA0G74Middle Ear

XA9RH9 category

Mastoid antrum

Also indexed as

Mastoid antrum

Nearby in Middle Ear

XA7XY6Eustachian tube
XA16S6Oval window
XA3KB2Tympanic cavity
XA3UT7Connective and other soft tissues of middle ear
XA08X4Tympanic membrane

PreviousXA16S6 — Oval window NextXA3KB2 — Tympanic cavity

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
Immune system
Endocrine system
Nervous system
Visual system
Auditory system
Circulatory system
Respiratory system
Digestive system
Integumentary system
3 more
XA01U5Ear
XA57R3Inner Ear
XA0G74Middle Ear
XA6ZY6External Ear
XA7XY6Eustachian tube
XA16S6Oval window
XA9RH9Mastoid antrum
XA3KB2Tympanic cavity
XA3UT7Connective and other soft tissues of middle ear
XA08X4Tympanic membrane

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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