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Chapters ENES DE

10Diseases of the ear or mastoid process
Diseases of middle ear or mastoid

AB11 category

Mastoiditis or related conditions

5 subordinate codes

AB11.0Acute mastoiditis
AB11.1Chronic mastoiditis
AB11.2Petrositis
AB11.3Mastoiditis, unspecified as acute or chronic
4B4YOther specified diseases of the immune system

Also indexed as

Mastoiditis or related conditions

Nearby in Diseases of middle ear or mastoid

AA80-AB0ZOtitis media
AB10Disorders of Eustachian tube
AB12Cholesteatoma of middle ear
AB13Perforation of tympanic membrane
AB14Acute myringitis
AB15Chronic myringitis
AB16Tympanosclerosis
AB17Adhesive middle ear disease

PreviousAB10 — Disorders of Eustachian tube NextAB12 — Cholesteatoma of middle ear

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
AA80-AB0ZOtitis media
AB10Disorders of Eustachian tube
AB11Mastoiditis or related conditions
AB12Cholesteatoma of middle ear
AB13Perforation of tympanic membrane
AB14Acute myringitis
AB15Chronic myringitis
AB16Tympanosclerosis
AB17Adhesive middle ear disease
AB18Discontinuity or dislocation of ear ossicles
AB19Acquired abnormalities of ear ossicles not related to discontinuity or dislocation
AB1APolyp of middle ear
AB1BMiddle ear cicatrix
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
AB11.0Acute mastoiditis
AB11.1Chronic mastoiditis
AB11.2Petrositis
AB11.3Mastoiditis, unspecified as acute or chronic
4B4YOther specified diseases of the immune system

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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