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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 380.21 Cholesteatoma of external ear 380.21 is a specific code that can be used to specify a diagnosis 380.21 contains 2 index entries View the ICD-9-CM Volume 1 380.* hierarchy 380.21 also known as: Keratosis obturans of external ear (canal) 380.21 excludes: cholesteatoma NOS (385.30-385.35) postmastoidectomy (383.32) Index entries containing 380.21: Cholesteatoma (ear) 385.30 external ear (canal) 380.21 Keratosis 701.1 obturans 380.21