G47.21
✓ Billable
Circadian rhythm sleep disorder, delayed sleep phase type
ICD-10-CM · FY2026 · Diseases of the Nervous System
Code
G47.21
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Nervous System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code G47.21?
ICD-10-CM code G47.21 represents Circadian rhythm sleep disorder, delayed sleep phase type. It is a billable diagnosis code in the Diseases of the Nervous System chapter, effective October 1, 2025 – September 30, 2026.
Is G47.21 billable?
Yes. G47.21 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is G47.21 in?
G47.21 belongs to the Diseases of the Nervous System chapter (G00–G99) of ICD-10-CM.
Related codes in the G47 category
G47
Sleep disorders
Non-billable
G47.0
Insomnia
Non-billable
G47.1
Hypersomnia
Non-billable
G47.2
Circadian rhythm sleep disorders
Non-billable
G47.3
Sleep apnea
Non-billable
G47.4
Narcolepsy and cataplexy
Non-billable
G47.5
Parasomnia
Non-billable
G47.6
Sleep related movement disorders
Non-billable
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