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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Symptoms, Signs, And Ill-Defined Conditions 780-799 > Symptoms 780-789 > General Symptoms 780.* > 2007 ICD-9-CM Diagnosis 780.55 Disruption of 24 hour sleep wake cycle, 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 Therefore, this code may be out of date.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 780.55 can be accessed here. 780.55 is a specific code that can be used to specify a diagnosis 780.55 contains 2 index entries View the ICD-9-CM Volume 1 780.* hierarchy Index entries containing 780.55: Disruption phase-shift, of 24 hour sleep wake cycle, unspecified 780.55 nonorganic origin 307.45 sleep wake cycle (24 hour), unspecified 780.55 circadian rhythm 327.33 nonorganic origin 307.45