Diseases of middle ear or mastoid

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01

Middle ear, derived from the first pharyngeal (branchial) pouch; has the malleus and incus and stapes and includes the spaces of the epitympanum and mesotympanum and hypotympanum. The mastoid; normally contains "air"; the lateral boundary of the mesotympanum is where the tympanic membrane is, or normally would be located.

code elsewhere

• Congenital conductive hearing loss  (AB50.0)
• Otosclerosis  (AB33)
• Congenital mixed conductive and sensorineural hearing loss  (AB50.2)

sections/codes in this section (AA80-AB1Z)

• Otitis media  (AA80-AB0Z)
• Disorders of Eustachian tube  (AB10)
• Mastoiditis or related conditions  (AB11)
• Cholesteatoma of middle ear  (AB12)
• Perforation of tympanic membrane  (AB13)
• Acute myringitis  (AB14)
• Chronic myringitis  (AB15)
• Tympanosclerosis  (AB16)
• Adhesive middle ear disease  (AB17)
• Discontinuity or dislocation of ear ossicles  (AB18)
• Acquired abnormalities of ear ossicles not related to discontinuity or dislocation  (AB19)
• Polyp of middle ear  (AB1A)
• Middle ear cicatrix  (AB1B)
• Other specified diseases of middle ear or mastoid  (AB1Y)
• Diseases of middle ear or mastoid, unspecified  (AB1Z)

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