2011 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 specify a diagnosis on a reimbursement claim.
- You are viewing the 2011 version of ICD-9-CM 327.31.
- More recent version(s) of ICD-9-CM 327.31: 2012 2013.
327.31 Alternative Terminology
Convert 327.31 to ICD-10-CM 

ICD-9-CM Volume 2 Index entries containing back-references to 327.31: