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    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g0399-home-sleep-test-type-iii-portable-monitor
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    HCPCS G0399: Home Sleep Test with Type III Portable Monitor

    HCPCS Level II code G0399 describes a home sleep test (HST) performed with a Type III portable monitor, unattended, capturing a minimum of four channels including two respiratory movement/airflow channels, one ECG/heart rate channel, and one oxygen saturation channel; the service is a diagnostic sleep study conducted in the patient’s home (ambulatory) setting using portable monitoring equipment.

    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.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 52-year-old patient with a history of loud snoring, witnessed apneas, excessive daytime sleepiness, and hypertension is referred by a primary care physician for evaluation of suspected obstructive sleep apnea (OSA). The clinician orders a home sleep test using a Type III portable monitor to capture at least four channels: two respiratory movement/airflow channels, one ECG/heart rate channel, and one oxygen saturation channel. The patient receives device education in the clinic, is fitted with the disposable sensors, and takes the unattended monitor home for an overnight study. The device records respiratory effort and airflow, heart rate rhythm, and pulse oximetry. The following day the patient returns the device or it is retrieved by a technician; recorded data are downloaded and scored by a certified sleep technologist. A board-certified sleep medicine physician reviews the scored study, documents interpretation, and generates a formal report with an apnea-hypopnea index (AHI) and diagnostic impression. Results inform treatment decisions such as positive airway pressure therapy, oral appliance referral, or further in-lab polysomnography if the home study is non-diagnostic or comorbid conditions are suspected. Typical site of service is the patient’s residence with initial education and device dispensing performed in an outpatient clinic or durable medical equipment (DME) provider setting.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    95806Sleep study, unattended portable monitor, heart rate, oxygen saturation, airflow, and respiratory effort (minimum of four channels)Often used interchangeably in some payor policies; documents a portable unattended sleep study with scoring when billed under CPT nomenclature.
    95810Polysomnography; attended attended (in-lab) sleep study with 4 or more channels of monitoringRepresents the in-lab attended alternative for diagnostic testing when home testing is inconclusive or comorbidities require attended monitoring.
    95811Polysomnography with initiation of continuous positive airway pressure (CPAP) therapyPerformed when in-lab titration is required after a diagnostic HST indicates need for CPAP therapy.
    G0403Screening colonoscopy follow-up (placeholder not related)Data not applicable; excluded from workflow — see clinically relevant entries above.
    G0398Home sleep test (HST) with type II or similar portable monitor, attended or with more channelsRelated HCPCS/G-code often used in payer lists for differing levels of home sleep testing complexity.

    Related Modifiers

    5 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…
    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…
    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…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    207K00000XAllergy & Immunology PhysicianAn allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Select…
    208000000XPediatrics PhysicianA pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectru…
    261QP2300XPrimary Care Clinic/CenterAmbulatory Health Care Facilities · Clinic/Center
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    390200000XStudent in an Organized Health Care Education/Training ProgramAn individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensur…
    2086S0102XSurgical Critical Care PhysicianA surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critica…
    163WP0218XPediatric Oncology Registered NurseNursing Service Providers · Registered Nurse

    Related ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    E66.01Morbid (severe) obesity due to excess calories
    F17.210Nicotine dependence, cigarettes, uncomplicated
    F51.9Sleep disorder not due to a substance or known physiological condition, unspecified
    G44.209Tension-type headache, unspecified, not intractable
    G47.00Insomnia, unspecified
    G47.20Circadian rhythm sleep disorder, unspecified type
    G47.30Sleep apnea, unspecified
    G47.31Primary central sleep apnea
    G47.33Obstructive sleep apnea (adult) (pediatric)
    G47.34Idiopathic sleep related nonobstructive alveolar hypoventilation

    Showing 1–10 of 28

    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

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    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.
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