Specific code 2012 ICD-9-CM Diagnosis Code 780.55
Disruption of 24 hour sleep wake cycle, unspecified
  • Short description: Irreg sleep-wake rhy NOS.
  • ICD-9-CM 780.55 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 780.55 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2012 version of ICD-9-CM 780.55.
  • More recent version(s) of ICD-9-CM 780.55: 2013 2014 2015.
Disease Synonyms
  • Disorder of sleep-wake cycle
  • Disruptions of 24 hour sleep wake cycle (disorder)
  • Irregular sleep wake pattern
  • Irregular sleep-wake pattern
  • Reversed sleep-wake cycle
  • Sleep disorder, disruptions 24 hr cycle
  • Sleep wake pattern, irregular
  • Sleep-wake schedule disorder
  • Sleep-wake schedule disorder, advanced phase type
  • Sleep-wake schedule disorder, delayed phase type
  • Sleep-wake schedule disorder, disorganized type
  • Sleep-wake schedule disorder, frequently changing type
Convert to ICD-10-CM: 780.55 converts approximately to:
  • 2015 ICD-10-CM G47.20 Circadian rhythm sleep disorder, unspecified type
ICD-9-CM Volume 2 Index entries containing back-references to 780.55:
  • Disruption
    • phase-shift, of 24 hour sleep wake cycle, unspecified 780.55
    • sleep wake cycle (24 hour), unspecified 780.55
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 780.55 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.