327: Organic sleep disorders
327.3 Circadian rhythm sleep disorder
Organic disorder of sleep wake cycle
Organic disorder of sleep wake schedule
Excludes:
alcohol induced circadian rhythm sleep disorder (291.82)
circadian rhythm sleep disorder of nonorganic origin (307.45)
disruption of 24 hour sleep wake cycle NOS (780.55)
drug induced circadian rhythm sleep disorder (292.85)

Home