2008 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 > Organic Sleep Disorders 327.* > 2008 ICD-9-CM Diagnosis 327.39 Other circadian rhythm sleep disorder  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 Therefore, this code may be out of date.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 327.39 can be accessed here. 327.39 is a specific code that can be used to specify a diagnosis 327.39 contains 5 index entries View the ICD-9-CM Volume 1 327.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 327.39: Disorder - see also Disease sleep 780.50 circadian rhythm 327.30 other 327.39 Inversion sleep rhythm 327.39 nonorganic origin 307.45 Irregular, irregularity sleep-wake rhythm (non-24-hour) 327.39 nonorganic origin 307.45 Rhythm sleep, inversion 327.39 nonorganic origin 307.45 Sleep rhythm inversion 327.39 nonorganic origin 307.45