7A60-7A6Z block
Circadian rhythm sleep-wake disorders
Definition
Circadian rhythm sleep-wake disorders are disturbances of the sleep-wake cycle (typically manifest as insomnia, excessive sleepiness, or both) due to alterations of the circadian time-keeping system, its entrainment mechanisms, or a misalignment of the endogenous circadian rhythm and the external environment. Sleep logs and, if possible, actigraphy for a minimum of one week should be utilized to define the specific sleep-wake schedule disturbance.
7 subordinate codes
7A60Delayed sleep-wake phase disorder7A61Advanced sleep-wake phase disorder7A62Irregular sleep-wake rhythm disorder7A63Non-24 hour sleep-wake rhythm disorder7A64Circadian rhythm sleep-wake disorder, shift work type7A65Circadian rhythm sleep-wake disorder, jet lag type4B4ZDiseases of the immune system, unspecified