327: Organic sleep disorders
327.1 Organic disorder of excessive somnolence [Organic hypersomnia]
Excludes:
hypersomnia NOS (780.54)
hypersomnia not due to a substance or known physiological condition (307.43-307.44)
hypersomnia with sleep apnea NOS (780.53)
Kleine-Levin syndrome
Menstrual related hypersomnia
Code first underlying condition
Excludes:
hypersomnia due to mental disorder (327.15)
Code first mental disorder
Excludes:
alcohol induced insomnia (291.82)
drug induced insomnia (292.85)

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