Convert ICD-10 Code G47.21 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
G47.21 Circadian rhythm sleep disorder, delayed sleep phase type		327.31 Circadian rhy-delay slp

ICD-10 to ICD-9 crosswalk for code G47.21 - circadian rhythm sleep disorder, delayed sleep phase type based on the most recent General Equivalence Mappings (GEMS) information.