Summary & Overview
HCPCS G0400: Home Sleep Test Using Type IV Portable Monitor
HCPCS Level II code G0400 denotes a home sleep test (HST) performed with a Type IV portable monitor that records a minimum of three channels, delivered in the patient’s home. This code matters nationally as home-based sleep testing is a widely used alternative to in-lab polysomnography for screening and diagnosing obstructive sleep apnea and other sleep-disordered breathing, offering lower cost and greater convenience while expanding access to diagnostic services.
Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise briefing on clinical context, typical sites of service, and the role of Type IV unattended monitoring. The publication summarizes payer coverage considerations, common billing modifiers, and where G0400 fits within diagnostic service lines. It also outlines what to expect in benchmarks and policy updates relevant to home sleep testing, and provides practical coding context for revenue cycle and compliance teams.
This summary is national in scope and intended to orient clinicians, billing professionals, and policy analysts to the clinical purpose and billing identity of G0400, and to point toward the detailed sections covering payer-specific rules, benchmarks, and documentation elements.
Billing Code Overview
HCPCS Level II code G0400 describes a home sleep test (HST) using a Type IV portable monitor, unattended, with a minimum of three channels. This service involves a portable diagnostic device used in the patient’s home to record at least three physiologic parameters during sleep to evaluate suspected sleep-disordered breathing.
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Service type: Diagnostic sleep testing using an unattended portable monitor
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Typical site of service: Patient’s home (home-based testing)
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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.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 |