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2007 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 > Nonsuppurative Otitis Media And Eustachian Tube Disorders 381.* > 2007 ICD-9-CM Diagnosis 381.6 Obstruction of eustachian tube  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 Therefore, this code may be out of date.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 381.6 can be accessed here. 381.6 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 381.* hierarchy 381.6 also known as: Stenosis of Eustachian tube Stricture of Eustachian tube