ICD-9-CM Codes ICD-9-PCS Codes

327.31 - Circadian rhythm sleep disorder, delayed sleep phase type

GEM Conversion to ICD-10 CM

G47.21

Fs: 00000 – Circadian rhythm sleep disorder, delayed sleep phase type

Sibling Codes

327.30

Circadian rhythm sleep disorder, unspecified

327.31

Circadian rhythm sleep disorder, delayed sleep phase type

327.32

Circadian rhythm sleep disorder, advanced sleep phase type

327.33

Circadian rhythm sleep disorder, irregular sleep-wake type

327.34

Circadian rhythm sleep disorder, free-running type

327.35

Circadian rhythm sleep disorder, jet lag type

327.36

Circadian rhythm sleep disorder, shift work type

327.37

Circadian rhythm sleep disorder in conditions classified elsewhere

327.39

Other circadian rhythm sleep disorder

Parent Sibling Codes

327.8

Other organic sleep disorders