For people managing diabetes, continuous glucose monitors have become an essential tool. Understanding how insurance covers continuous glucose monitor devices can make them far more accessible than many patients realize.
What Is a Continuous Glucose Monitor?
A continuous glucose monitor, commonly called a CGM, is a medical device that tracks blood sugar levels throughout the day and night without requiring constant finger-stick testing. Rather than capturing a single snapshot of glucose at one moment, a CGM provides ongoing readings, helping patients and their healthcare providers spot patterns and respond to dangerous fluctuations in real time. For individuals managing diabetes—whether Type 1, Type 2, or another form—this type of monitoring can be a significant step forward in daily management.
CGMs typically consist of a small sensor worn on the body, a transmitter that sends data wirelessly, and a receiver or compatible smartphone app that displays readings. Some devices also include alert systems that notify the user when glucose levels rise or fall outside a target range. Given how central these tools have become to modern diabetes care, the question of how to obtain one through insurance is a priority for many patients.
Medicare Coverage for CGM Devices
Medicare covers CGMs and related supplies, including sensors, when a doctor or other qualified healthcare provider orders the device and the patient satisfies specific eligibility criteria (source). Coverage falls under Medicare Part B, which handles durable medical equipment (DME). For patients who rely on Medicare as their primary insurance, this is the most direct path to obtaining a CGM with financial assistance.
Historically, Medicare’s criteria for CGM coverage were fairly restrictive, but that changed significantly in early 2023. The Centers for Medicare and Medicaid Services announced expanded coverage rules in March 2023, with the changes taking effect on April 16, 2023 (source). These updates broadened who qualifies, reflecting a growing recognition of the clinical value CGMs offer to a wider population of diabetes patients.
Who Qualifies Under the Updated Medicare Rules
Under the revised criteria, Medicare now extends CGM access to patients who use insulin in any form and at any dosage level. The previous requirement that patients meet a specific daily insulin threshold has been removed, which means more insulin-dependent individuals can now qualify (source). This adjustment alone expanded the pool of eligible patients considerably.
Perhaps even more significant is the expansion for patients who do not use insulin at all. Medicare now permits CGM coverage for individuals with diabetes who have experienced problematic hypoglycemia—specifically, recurring level 2 hypoglycemic events or even a single level 3 hypoglycemic event—regardless of whether they take insulin (source). This represents a meaningful shift toward supporting patients whose glucose instability poses serious health risks even without insulin dependence.
Additional eligibility requirements include that the patient or their caregiver must have received sufficient training to operate the device correctly, and the CGM must be ordered by a healthcare provider (source). These conditions are designed to ensure that devices are used safely and appropriately.
Cost Sharing and Approved Devices
Once a patient meets the Part B deductible, Medicare covers 80% of the approved amount for a CGM and its supplies, leaving the patient responsible for the remaining 20%—provided the supplier accepts assignment (source). Patients who work with suppliers that do not participate in Medicare or refuse assignment may face higher out-of-pocket costs, so verifying the supplier’s status beforehand is important.
When it comes to brand selection, Medicare does not restrict coverage to a single manufacturer. Any CGM that has received FDA approval is eligible for coverage under the program (source). This flexibility gives patients and their providers room to select a device that best suits the individual’s medical needs and lifestyle preferences.
Private Insurance and CGM Coverage
Private insurance can also cover continuous glucose monitors, but the rules are less standardized than Medicare’s. Employer-sponsored and Marketplace plans may limit coverage to particular CGM brands, require prior authorization, or apply their own medical-necessity criteria before approving the device. The American Diabetes Association specifically advises patients to check which diabetes devices and supplies their plan covers, what they will cost, and whether an exception is available if the preferred CGM is not on the plan’s formulary (source).
Individual insurers can impose detailed requirements. For example, UnitedHealthcare’s current commercial CGM policy uses prior authorization and medical-necessity criteria for certain devices, with coverage depending on factors such as diabetes diagnosis, treatment needs, device type, and continued clinical benefit (source). Because these rules can differ by insurer and even by plan, patients should confirm whether the CGM is covered under the pharmacy or medical benefit, whether a preferred brand must be used, what documentation the prescriber needs to submit, and what deductible, copay, or coinsurance will apply before the device is ordered.
The Role of the Prescribing Provider
A physician or other qualified healthcare provider plays a central role in the CGM coverage process across all insurance types. Providers typically submit documentation supporting the medical necessity of the device, which serves as the foundation of any insurance approval. For Medicare specifically, the ordering provider must meet program requirements, and the patient’s condition must align with the eligibility criteria described above.
Patients who believe they may qualify for CGM coverage are encouraged to discuss the option with their diabetes care team. Providers familiar with insurance processes can help navigate documentation requirements and ensure the appropriate criteria are clearly established in the patient’s medical record—an important step toward a smoother approval process.
Learn More About CGM Insurance Coverage
Continuous glucose monitors have transformed how millions of people manage diabetes, offering real-time data that supports better decisions and safer daily living. Medicare’s expanded 2023 coverage criteria opened the door for a broader range of patients, including those without insulin dependence who experience dangerous glucose lows. Private insurance plans also frequently provide coverage, though terms vary.
Understanding eligibility requirements, cost-sharing structures, and the role of a prescribing provider empowers patients to pursue the coverage they may already qualify for. Working with a knowledgeable healthcare provider and reviewing insurance plan details are practical first steps toward accessing a CGM through insurance benefits.