G47.27 Circadian rhythm sleep disorder in conditions classified elsewhere

Billable ICD-10-CM code, FY2026.

Code first

• underlying condition

Applies from G47 Sleep disorders

Excludes2 (not included here)

• nightmares (F51.5)
• nonorganic sleep disorders (F51.-)
• sleep terrors (F51.4)
• sleepwalking (F51.3)

Applies from G47.2 Circadian rhythm sleep disorders

Applicable to

• Disorders of the sleep wake schedule
• Inversion of nyctohemeral rhythm
• Inversion of sleep rhythm

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 327.37 Circadian rhythm sleep disorder in conditions classified elsewhere

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to G47.27

Back-references to G47

• Type 2 Excludes: F51 Sleep disorders not due to a substance or known physiological condition ("organic sleep disorders (G47.-)")

Diagnosis Index entries for G47.27

• Disorder (of) › sleep › circadian rhythm › in conditions classified elsewhere

Nearby codes

• 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 classified elsewhere (this code)
• G47.29 Other circadian rhythm sleep disorder
• G47.3 Sleep apnea
• G47.30 Sleep apnea, unspecified
• G47.31 Primary central sleep apnea
• G47.32 High altitude periodic breathing