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ICD-10-CM Diagnosis Codes
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6. Diseases of the nervous system (G00-G99)
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G40-G47 Episodic and paroxysmal disorders (G40-G47)
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G47 Sleep disorders
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G47.2 Circadian rhythm sleep disorders
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G47.20   Circadian rhythm sleep disorder, unspecified type
G47.21   Circadian rhythm sleep disorder, delayed sleep phase type
G47.22   Circadian rhythm sleep disorder, advanced sleep phase type
G47.23   Circadian rhythm sleep disorder, irregular sleep wake type
G47.24   Circadian rhythm sleep disorder, free running type
G47.25   Circadian rhythm sleep disorder, jet lag type
G47.26   Circadian rhythm sleep disorder, shift work type
G47.27   Circadian rhythm sleep disorder in conditions classd elswhr
G47.29   Other circadian rhythm sleep disorder
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