AA40.1

ICD-11 MMS 2026-01

Acquired stenosis of external auditory canal

Description

Acquired stenosis of external auditory canal was described as resulting from a number of different causes. Since then, histology and imaging studies of this disease have shown that a common cascade of inflammatory changes resulting from these different causes is the primary pathogenesis leading to medial canal fibrosis. Once there is complete obstruction of the external auditory canal, surgery is the primary treatment.

Index terms

  • Acquired stenosis of external auditory canal
  • Auditory canal narrowing
  • acquired stricture of external auditory canal
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  • Collapse of external ear canal

Exclusions from above levels

  • 01 – Certain infectious or parasitic diseases
  • 02 – Neoplasms
  • 05 – Endocrine, nutritional or metabolic diseases
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  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 19 – Certain conditions originating in the perinatal period
  • 22 – Injury, poisoning or certain other consequences of external causes

Sibling codes

  • AA40.0 – Exostosis of external auditory canal
  • AA40.2 – Cholesteatoma of external auditory canal
  • AA40.Y – Other specified acquired deformity of external auditory canal
  • AA40.Z – Acquired deformity of external auditory canal, unspecified

Foundation entity

Acquired stenosis of external auditory canal – http://id.who.int/icd/entity/1125942873

Allowed postcoordination axes

Part of: AA40: Acquired deformity of external auditory canal › 10: Diseases of the ear or mastoid process