ICD10BillableValid for clinical use
ICD-10 Code G47.27: Circadian rhythm sleep disorder in conditions classified elsewhere
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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 disorder in conditions classified elsewhere in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
Code hierarchy
chapter
6Diseases of the nervous system (G00-G99)
block
G40-G47Episodic and paroxysmal disorders
category
G47Sleep disorders
category
G47.2Circadian rhythm sleep disorders
currentG47.2
Official coding notes
Applicable to
- underlying condition
Code first
- underlying condition
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
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 typecodeG47.29Other circadian rhythm sleep disordercode
Sibling codes
G47.20Circadian rhythm sleep disorder, unspecified typebillableG47.21Circadian rhythm sleep disorder, delayed sleep phase typebillableG47.22Circadian rhythm sleep disorder, advanced sleep phase typebillableG47.23Circadian rhythm sleep disorder, irregular sleep wake typebillableG47.24Circadian rhythm sleep disorder, free running typebillableG47.25Circadian rhythm sleep disorder, jet lag typebillableG47.26Circadian rhythm sleep disorder, shift work typebillableG47.29Other circadian rhythm sleep disorderbillable
Coverage-related procedures and services
CPT 31720high
CATHETER ASPIRATION (SEPARATE PROCEDURE); NASOTRACHEAL
Source: CMS coverage guidance
CPT 94664high
DEMONSTRATION AND/OR EVALUATION OF PATIENT UTILIZATION OF AN AEROSOL GENERATOR, NEBULIZER, METERED DOSE INHALER OR IPPB DEVICE
Source: CMS coverage guidance
HCPCS G0398high
HOME SLEEP STUDY TEST (HST) WITH TYPE II PORTABLE MONITOR, UNATTENDED; MINIMUM OF 7 CHANNELS: EEG, EOG, EMG, ECG/HEART RATE, AIRFLOW, RESPIRATORY EFFORT AND OXYGEN SATURATION
Source: CMS coverage guidance
HCPCS G0399high
HOME SLEEP TEST (HST) WITH TYPE III PORTABLE MONITOR, UNATTENDED; MINIMUM OF 4 CHANNELS: 2 RESPIRATORY MOVEMENT/AIRFLOW, 1 ECG/HEART RATE AND 1 OXYGEN SATURATION
Source: CMS coverage guidance
HCPCS G0400high
HOME SLEEP TEST (HST) WITH TYPE IV PORTABLE MONITOR, UNATTENDED; MINIMUM OF 3 CHANNELS
Source: CMS coverage guidance
CPT 95805high
MULTIPLE SLEEP LATENCY OR MAINTENANCE OF WAKEFULNESS TESTING, RECORDING, ANALYSIS AND INTERPRETATION OF PHYSIOLOGICAL MEASUREMENTS OF SLEEP DURING MULTIPLE TRIALS TO ASSESS SLEEPINESS
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Circadian rhythm sleep disorder in conditions classified elsewhere
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.