Circadian rhythm sleep disorder, shift work type

This code represents a sleep-wake cycle disorder characterized by insomnia or excessive sleepiness that is primarily caused by a mismatch between the patient's endogenous circadian rhythm and the sleep-wake schedule required by their work. It specifically pertains to individuals whose work hours regularly conflict with their natural sleep patterns, such as those working night shifts or rotating shifts.

Use this code when documentation clearly indicates a patient is experiencing sleep disturbances (insomnia, hypersomnia, or both) directly attributable to a shift work schedule. Supporting documentation should include a history of shift work, symptoms consistent with circadian rhythm disruption, and the absence of other primary sleep disorders or medical conditions explaining the symptoms.

• Ensure the documentation explicitly links the sleep disturbance to shift work, not just general insomnia or fatigue.
• Differentiate from other circadian rhythm sleep disorders like delayed or advanced sleep phase syndrome, which are not primarily caused by work schedules.
• Consider co-reporting with codes for specific symptoms like insomnia (e.g., F51.0x) or hypersomnia (e.g., F51.1x) if they are distinct and require separate management, but prioritize the underlying circadian rhythm disorder.