Home > 2006 ICD-9-CM Diagnosis Codes > Diseases Of The Nervous System And Sense Organs 320-389 > Inflammatory Diseases Of The Central Nervous System 320-327 > Organic sleep disorders 327-
Specific code 2006 ICD-9-CM Diagnosis Code 327.31
"circadian rhythm sleep disorder, delayed sleep phase type"
  • Short description: CIRCADIAN RHY-DELAY SLP.
  • ICD-9-CM 327.31 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 327.31 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
  • You are viewing the 2006 version of ICD-9-CM 327.31.
  • More recent version(s) of ICD-9-CM 327.31: 2007 2008 2009 2010 2011 2012 2013 2014 2015.
Convert to ICD-10-CM: 327.31 converts directly to:
  • 2015/16 ICD-10-CM G47.21 Circadian rhythm sleep disorder, delayed sleep phase type
Approximate Synonyms
  • Circadian rhythm sleep disorder, delayed phase
  • Circadian rhythm sleep disorder, delayed sleep phase
  • Circadian rhythm sleep disorder, delayed sleep phase type
  • Sleep disorder, circadian rhythm, delayed phase
  • Sleep wake cycle disorder, delayed phase type
  • Sleep-wake schedule disorder, delayed phase
  • Sleep-wake schedule disorder, delayed phase type
ICD-9-CM Volume 2 Index entries containing back-references to 327.31:
  • Disorder - see also Disease
    • sleep 780.50
      • with apnea - see Apnea, sleep
      • alcohol induced 291.82
      • arousal 307.46
      • circadian rhythm 327.30
      • drug induced 292.85
      • initiation or maintenance (see also Insomnia) 780.52
      • nonorganic origin 307.40
      • organic specified type NEC 327.8
      • periodic limb movement 327.51
      • specified NEC 780.59
      • wake
        • cycle - see Disorder, sleep, circadian rhythm
        • schedule - see Disorder, sleep, circadian rhythm
 327.30 ICD9Data.com 327.32 
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 327.31 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 2006 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.
Free ICD-9-CM Codes
Site Information
Free ICD-10-CM/PCS Codes
Free HCPCS Codes