ICD-9-CM Vol. 1 Diagnostic Codes →
6. DISEASES OF THE NERVOUS SYSTEM AND SENSE ORGANS (320-389) →
section notes
ORGANIC SLEEP DISORDERS (327) →
section notes
327 Organic sleep disorders →
section notes
327.3 Circadian rhythm sleep disorder →
section notes
327.30   Circadian rhym sleep NOS
327.31   Circadian rhy-delay slp
327.32   Circadian rhy-advc sleep
327.33   Circadian rhym-irreg slp
327.34   Circadian rhym-free run
327.35   Circadian rhythm-jetlag
327.36   Circadian rhy-shift work
327.37   Circadian rhym oth dis
327.39   Circadian rhym sleep NEC
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