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Chapters ENES DE

10Diseases of the ear or mastoid process
Diseases of external ear
Noninflammatory disorders of the external ear

AA40 category

Acquired deformity of external auditory canal

5 subordinate codes

AA40.0Exostosis of external auditory canal
AA40.1Acquired stenosis of external auditory canal
AA40.2Cholesteatoma of external auditory canal
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

Nearby in Noninflammatory disorders of the external ear

AA41Acquired deformity of pinna
AA42Impacted cerumen
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

NextAA41 — Acquired deformity of pinna

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
AA00-AA6ZDiseases of external ear
AA80-AB1ZDiseases of middle ear or mastoid
AB30-AB3ZDiseases of inner ear
AB50-AB5ZDisorders with hearing impairment
AB70-AB7YDisorders of ear, not elsewhere classified
AB90-AB93Postprocedural disorders of ear or mastoid process
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
AA00-AA0ZInfectious diseases of external ear
AA10-AA3ZOtitis externa
AA40-AA4ZNoninflammatory disorders of the external ear
4B4ZDiseases of the immune system, unspecified
AA40Acquired deformity of external auditory canal
AA41Acquired deformity of pinna
AA42Impacted cerumen
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
AA40.0Exostosis of external auditory canal
AA40.1Acquired stenosis of external auditory canal
AA40.2Cholesteatoma of external auditory canal
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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