2026 ICD-10-CM Diagnosis Code G47.27Circadian rhythm sleep disorder in conditions classified elsewhere

ICD-10-CM Codes›G00–G99›G40-G47›G47

ICD-10-CM G47.27
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G47.27 is a billable ICD-10-CM diagnosis code for circadian rhythm sleep disorder in conditions classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as circadian rhythm sleep disorder caused by alcohol. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sleep wake disorders.

Code Identity

ICD-10-CM Code
G47.27
Billable Status
Yes — Valid for Submission
Code Describes
Circadian rhythm sleep disorder in conditions classified elsewhere
Short Description
Circadian rhythm sleep disorder in conditions classd elswhr
Parent Code
G47.2
Circadian rhythm sleep disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG47Sleep disorders
This CodeG47.27Circadian rhythm sleep disorder in conditions classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G47.27.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Circadian rhythm sleep disorder caused by alcohol

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code First

  • underlying condition

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS016
Sleep wake disorders
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Sleep Disorders

Sleep is a complex biological process. While you are sleeping, you are unconscious, but your brain and body functions are still active. They are doing a number of important jobs that help you stay healthy and function at your best. So when you don't get enough quality sleep, it does more than just make you feel tired.

The full article covers:

  • What is sleep?
  • What are sleep disorders?
  • What causes sleep disorders?
  • What are the symptoms of sleep disorders?
  • How are sleep disorders diagnosed?
  • What are the treatments for sleep disorders?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G47.27 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
327.37 Circadian rhym oth dis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G47.27Overview

Is G47.27 (Circadian rhythm sleep disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report circadian rhythm sleep disorder in conditions classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can G47.27 be a principal diagnosis?

No. This is a manifestation code: circadian rhythm sleep disorder in conditions classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of G47.27?

Under the General Equivalence Mappings, circadian rhythm sleep disorder in conditions classified elsewhere converts to ICD-9-CM 327.37 (circadian rhym oth dis). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.