Alphabetic Index FY2027

G47.2

Circadian rhythm sleep disorders

FY2027Chapter 6: Diseases of the nervous system/G40–G47 Episodic and paroxysmal disorders

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

G47.2 is a non-billable ICD-10-CM code header for circadian rhythm sleep disorders. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are 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 and 5 more. Its coding notes include 12 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from G47 Sleep disorders
Also from chapter/block level (8 notes)
Inherited from Chapter 6 Diseases of the nervous system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Inclusion terms

Conditions classified to this code.

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

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries

More specific codes under G47.2 9