2006 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.* > 2006 ICD-9-CM Diagnosis 327.1 Hypersomnia View the most recent version of ICD-9-CM 327.1 327.1 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)