Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g0400-home-sleep-test-type-iv-portable-monitor
    Ask Trek AI about this page

    HCPCS G0400: Home Sleep Test with Type IV Portable Monitor

    HCPCS Level II code G0400 describes a home sleep test (HST) using a Type IV portable monitor, unattended, with a minimum of three recorded channels; this service is a diagnostic sleep study (portable cardiorespiratory monitoring) performed in the patient’s home rather than an in-lab sleep center and is classified as an ambulatory diagnostic test for evaluation of suspected sleep-disordered breathing.

    For related coverage guidance, see recent payer policy updates: Esophagogastroduodenoscopy (EGD) Coverage Policy, Magnetic Sphincter Augmentation for the Treatment of Gastroesophageal Reflux Disease (GERD), Serum Testing for Hepatic Fibrosis in the Evaluation and Monitoring of Chronic Liver Disease.

    Customize your policy alerts

    Sign up for hcpcs G0400 policy alerts

    Get alerted when payer policies referencing G0400 are released or updated.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    Table of contents

    Progress1 / 7

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    Clinical & Coding Specifications

    Clinical Context

    A 52-year-old patient with excessive daytime sleepiness, loud snoring reported by a bed partner, and hypertension is referred for a home sleep test. The referring sleep medicine physician orders a Type IV portable unattended monitor to evaluate for obstructive sleep apnea (OSA). The device records a minimum of three channels (typically airflow or respiratory effort, pulse oximetry, and heart rate) while the patient self-applies the device at home on a scheduled night. The clinical workflow includes: pre-test counseling and device instructions provided by a respiratory therapist or sleep lab technologist; device pickup or courier delivery; documented verification of patient identity and test date/time; unattended overnight recording at home; device return to the sleep center; data upload and automated scoring followed by manual review by a technologist; and interpretation and final report by a credentialed physician (sleep medicine or pulmonary specialist). Billing uses the HCPCS Level II code G0400 for the unattended home sleep test with a Type IV portable monitor (minimum of three channels). Typical site of service is the patient’s home or residence; device setup and return occur at an outpatient sleep clinic, durable medical equipment vendor location, or via courier service. Payers commonly involved include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare, following their individual coverage and medical necessity criteria for home sleep testing.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    95810Polysomnography; sleep staging with the initiation of continuous positive airway pressure (CPAP) when performed, attendedPerformed in-lab for definitive diagnosis or CPAP titration when home testing is insufficient
    95806Sleep study, unattended home sleep test, type II portable monitor; four or more channels of cardio-respiratory monitoringAlternative home monitor with more channels; used when additional channels are required
    95800Sleep study, unattended home sleep test, type III portable monitor; minimum of four channelsRelated home testing code with different device classification and channel requirements
    94760Noninvasive ear or pulse oximetry for oxygen saturationPulse oximetry data is commonly part of the Type IV home monitor recording
    99457Remote physiologic monitoring treatment management services, clinical staff/physician timeUsed when remote monitoring and management of PAP therapy or follow-up is billed after test interpretation

    Related Modifiers

    6 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    207R00000XInternal Medicine PhysicianA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
    207V00000XObstetrics & Gynecology PhysicianAn obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproducti…
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    163W00000XRegistered Nurse(1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive…
    208D00000XGeneral Practice PhysicianA physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
    207RI0200XInfectious Disease PhysicianAn internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this…
    2278G0305XGeriatric Care Certified Respiratory TherapistCare of older patients who have age and/or disease related decremental pulmonary changes. Diagnosis and treatment is very important for this group si…
    332BN1400XNursing Facility Supplies (DME)Suppliers · Durable Medical Equipment & Medical Supplies

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    E66.01Morbid (severe) obesity due to excess calories
    E66.9Obesity, unspecified
    F17.210Nicotine dependence, cigarettes, uncomplicated
    F51.3Sleepwalking [somnambulism]
    G44.1Vascular headache, not elsewhere classified
    G47.30Sleep apnea, unspecified
    G47.31Primary central sleep apnea
    G47.33Obstructive sleep apnea (adult) (pediatric)
    G47.34Idiopathic sleep related nonobstructive alveolar hypoventilation
    G47.39Other sleep apnea

    Showing 1–10 of 26

    Related Payer Policy Updates

    Specialty: Gastroenterology1 / 3

    10 rows

    PolicyPayerEffective Date
    Esophagogastroduodenoscopy (EGD) Coverage Policyevicore2026-11-05
    Magnetic Sphincter Augmentation for the Treatment of Gastroesophageal Reflux Disease (GERD)univerahealthcare2026-10-15
    Serum Testing for Hepatic Fibrosis in the Evaluation and Monitoring of Chronic Liver DiseaseOscar Health2026-10-01
    Fecal Analysis in the Diagnosis of Intestinal Dysbiosis and Fecal Microbiota Transplant TestingOscar Health2026-10-01
    Pancreatic Enzyme Testing for Acute PancreatitisOscar Health2026-10-01
    Helicobacter pylori TestingOscar Health2026-10-01
    Celiac Disease TestingOscar Health2026-10-01
    Laboratory Testing for the Diagnosis of Inflammatory Bowel DiseaseOscar Health2026-10-01
    Percutaneous Electrical Nerve Field Stimulation (PENFS)Cigna2026-09-15
    Colorectal Cancer ScreeningBlue Cross Blue Shield - New Mexico2026-09-04

    Related Codes

    HCPCS-G9490-HOME-ASSESSMENT-NON-HOMEBOUND

    HCPCS G9490: Home Visit Patient Assessment for Non-Homebound Beneficiary

    HCPCS-G0008-INFLUENZA-VACCINE-ADMINISTRATION

    HCPCS G0008: Administration of Influenza Virus Vaccine

    HCPCS-G0009-PNEUMOCOCCAL-VACCINE-ADMINISTRATION

    HCPCS G0009: Administration of Pneumococcal Vaccine

    HCPCS-G0010-HEPATITIS-B-VACCINE-ADMINISTRATION

    HCPCS G0010: Administration of Hepatitis B Vaccine

    HCPCS-G0011-PREP-COUNSELING-HIV-RISK-REDUCTION-ADHERENCE

    HCPCS G0011: Individual PrEP Counseling, HIV Risk Assessment

    HCPCS-G0012-PRE-EXPOSURE-PROPHYLAXIS-INJECTION-HIV-PREVENTION

    HCPCS G0012: Injection of PrEP Drug for HIV Prevention

    HCPCS-G0013-PREP-INDIVIDUAL-COUNSELING-HIV-RISK-REDUCTION

    HCPCS G0013: Individual PrEP Counseling by Clinical Staff

    HCPCS-G0017-PSYCHOTHERAPY-CRISIS-FIRST-60-MINUTES-NON-OFFICE

    HCPCS G0017: Psychotherapy for Crisis, First 60 Minutes

    HCPCS-G0018-PSYCHOTHERAPY-CRISIS-ADDITIONAL-30-MINUTES-NON-OFFICE

    HCPCS G0018: Psychotherapy for Crisis, Additional 30 Minutes

    HCPCS-G0019-COMMUNITY-HEALTH-INTEGRATION-SDOH-CARE-COORDINATION

    HCPCS G0019: Community Health Integration, Person-Centered Assessment

    Showing 1–10 of 1996

    • More pages

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.