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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Inflammatory Diseases Of The Central Nervous System 320-327 > Sleep Disorders 327.* > 2007 ICD-9-CM Diagnosis 327.1 Hypersomnia  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 Therefore, this code may be out of date.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 327.1 can be accessed here. 327.1 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 327.* hierarchy 327.1 excludes: hypersomnia NOS (780.54) hypersomnia not due to a substance or known physiological condition (307.43-307.44) hypersomnia with sleep apnea NOS (780.53)