Diseases of middle ear or mastoid

Definition

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.

15 subordinate codes

• 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

Nearby in Diseases of the ear or mastoid process

• AA00-AA6ZDiseases of external ear
• 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