F51 ICD Code: Sleep Disorders Not Due to a Substance or Known Physiological Condition
Nonorganic sleep disorders involve disturbances in sleep patterns or quality unrelated to medical conditions or substances.
F51.1: Hypersomnia disorder - Excessive sleepiness, prolonged sleep episodes, or difficulty awakening from sleep, causing significant distress or impairment in daily functioning.
F51.3: Circadian rhythm sleep-wake disorders - Disturbances in the sleep-wake cycle, such as delayed sleep phase disorder or shift work disorder, causing significant distress or impairment in daily functioning.
F51.5: Parasomnias - Abnormal behaviors or experiences during sleep, such as sleepwalking, sleep terrors, or nightmares.
F51.9: Sleep disorder, unspecified - Sleep disorder without further specification of subtype or features.