ICD10
ICD-10 Code G47.2: Circadian rhythm sleep disorders
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).
When is it used?
- May be used when a clinician documents circadian rhythm sleep disorders in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
chapter
6Diseases of the nervous system (G00-G99)
block
G40-G47Episodic and paroxysmal disorders
category
G47Sleep disorders
currentG47
Official coding notes
Inclusion terms
- Disorders of the sleep wake schedule
- Inversion of nyctohemeral rhythm
- Inversion of sleep rhythm
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
NeurologistGeneral Physician
Related codes
G47.20Circadian rhythm sleep disorder, unspecified typecodeG47.21Circadian rhythm sleep disorder, delayed sleep phase typecodeG47.22Circadian rhythm sleep disorder, advanced sleep phase typecodeG47.23Circadian rhythm sleep disorder, irregular sleep wake typecodeG47.24Circadian rhythm sleep disorder, free running typecodeG47.25Circadian rhythm sleep disorder, jet lag typecodeG47.26Circadian rhythm sleep disorder, shift work typecodeG47.27Circadian rhythm sleep disorder in conditions classified elsewherecodeG47.29Other circadian rhythm sleep disordercode
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 15976004high
Abnormal circadian rhythm
Source: SNOMED International ICD-10 map
SNOMED_CT 91461000119108high
Circadian rhythm disorder caused by drug
Source: SNOMED International ICD-10 map
SNOMED_CT 135331000119105high
Circadian rhythm sleep disorder caused by alcohol
Source: SNOMED International ICD-10 map
SNOMED_CT 713498009high
Circadian rhythm sleep disorder of shift work type
Source: SNOMED International ICD-10 map
SNOMED_CT 443484004high
Decreased need for sleep
Source: SNOMED International ICD-10 map
SNOMED_CT 401161007high
Delayed onset of sleep
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
G47.2
Replacement codes
G47.20 — Circadian rhythm sleep disorder, unspecified typeG47.21 — Circadian rhythm sleep disorder, delayed sleep phase typeG47.22 — Circadian rhythm sleep disorder, advanced sleep phase typeG47.23 — Circadian rhythm sleep disorder, irregular sleep wake typeG47.24 — Circadian rhythm sleep disorder, free running typeG47.25 — Circadian rhythm sleep disorder, jet lag typeG47.26 — Circadian rhythm sleep disorder, shift work typeG47.27 — Circadian rhythm sleep disorder in conditions classified elsewhereG47.29 — Other circadian rhythm sleep disorder
Common synonyms
Circadian rhythm sleep disorders
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.