Circadian rhythm sleep disorder, advanced sleep phase type

This code describes a chronic sleep disorder characterized by a persistent pattern of sleep and wake times that are significantly earlier than desired or socially acceptable. Individuals with this condition typically fall asleep in the early evening and wake up in the very early morning, often feeling refreshed but struggling with social or occupational obligations due to their advanced sleep schedule.

Apply this code when documentation clearly indicates a patient consistently falls asleep and wakes up several hours earlier than conventional times, leading to distress or functional impairment. This diagnosis is supported by a detailed sleep history, sleep diary, and often actigraphy, demonstrating a stable, advanced sleep-wake rhythm.

• Differentiate from other circadian rhythm disorders; ensure the documentation specifies "advanced sleep phase type."
• Do not confuse with insomnia or hypersomnia, which may be symptoms but not the primary circadian rhythm disruption.
• Consider co-occurring mental health conditions or other sleep disorders that may require additional coding.