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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 > Vertiginous Syndromes And Other Disorders Of Vestibular System 386.* > 2008 ICD-9-CM Diagnosis 386.42 Oval window fistula  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 Therefore, this code may be out of date.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 386.42 can be accessed here. 386.42 is a specific code that can be used to specify a diagnosis 386.42 contains 2 index entries View the ICD-9-CM Volume 1 386.* hierarchy Index entries containing 386.42: Fistula (sinus) 686.9 labyrinth, labyrinthine NEC 386.40 oval window 386.42 oval window (internal ear) 386.42