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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 > Other Disorders Of Ear 388.* > 2007 ICD-9-CM Diagnosis 388.40 Abnormal auditory perception unspecified  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 Therefore, this code may be out of date.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 388.40 can be accessed here. 388.40 is a specific code that can be used to specify a diagnosis 388.40 contains 5 index entries View the ICD-9-CM Volume 1 388.* hierarchy Index entries containing 388.40: Abnormal, abnormality, abnormalities - see also Anomaly auditory perception NEC 388.40 Autophony 388.40 Disturbance - see also Disease hearing, except deafness 388.40 Dysacousis 388.40 Paracusis 388.40