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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Diseases Of The Ear And Mastoid Process 380-389 > Disorders Of External Ear 380.* > 2008 ICD-9-CM Diagnosis 380.5 Acquired stenosis of external ear canal  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 380.5 can be accessed here. 380.5 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 380.* hierarchy 380.5 also known as: Collapse of external ear canal