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A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]
Generally, diseases outlined within the ICD-11 codes 7A60-7A6Z within Sleep-wake disorders should be included in this category. Pages in category "Circadian rhythm sleep–wake disorders" The following 5 pages are in this category, out of 5 total.
Circadian rhythm sleep disorder, advanced sleep phase type 327.32 G47.22 Circadian rhythm sleep disorder, irregular sleep-wake type 327.33 G47.23 Circadian rhythm sleep disorder, free-running (non-entrained) type 327.34 G47.24 Circadian rhythm sleep disorder, jet lag type 327.35 G47.25 Circadian rhythm sleep disorder, shift work type 327.36 G47.26
All of these are examples of circadian rhythm disorders, which are problems with the alignment between your sleep-wake cycle and your responsibilities for the day—like going to work or school ...
ICD-9-CM: Circadian rhythm sleep disorder, free-running type; code 327.34 became effective in October 2005. Prior to the introduction of this code, the nonspecific code 307.45, Circadian rhythm sleep disorder of non-organic origin, was available, and as of 2014 remains the code recommended by the DSM-5.
327.31 Circadian rhythm sleep disorder, delayed sleep phase type; 327.32 Circadian rhythm sleep disorder, advanced sleep phase type; 327.33 Circadian rhythm sleep disorder, irregular sleep-wake type; 327.34 Circadian rhythm sleep disorder, free-running type; 327.35 Circadian rhythm sleep disorder, jet lag type