Medicare's Coverage of CGM Devices for Type 2 Diabetes

Medicare Part B covers continuous glucose monitors (CGMs) for people with type 2 diabetes, but only if you meet specific conditions. You must be taking insulin — either multiple daily injections or an insulin pump — and your doctor must order the device as medically necessary. If you take only oral medications or injectable non-insulin drugs like GLP-1 agonists, Medicare will not cover a CGM under current rules, even if your doctor recommends one.

The coverage includes the monitor itself, the sensors, and the transmitter. You pay 20% of the Medicare-approved amount after you meet your Part B deductible. The exact out-of-pocket cost depends on which device your doctor prescribes and which supplier you use, because Medicare-approved amounts vary by supplier and region.

Key Takeaways

  • Medicare Part B covers CGMs only for type 2 diabetes patients who use insulin — either multiple daily injections or a pump — not for those on oral or non-insulin injectable medications.
  • Your doctor must write an order stating the CGM is medically necessary, and you must have a face-to-face visit with your doctor within the past 12 months.
  • You pay 20% coinsurance after your Part B deductible, with the exact amount depending on the device model and your Medicare-approved supplier.
  • Durable medical equipment (DME) suppliers deliver and manage your CGM supplies, and you can choose which supplier to use as long as they are Medicare-enrolled.
  • Coverage rules change periodically, so confirm current requirements with your doctor or a DME supplier before ordering.

Which Type 2 Diabetes Patients may have access to for CGM Coverage

The insulin requirement is the main gate. If you inject insulin — whether once daily, multiple times daily, or through a pump — you meet this part of the requirement. If you take metformin, sulfonylureas, SGLT2 inhibitors, DPP-4 inhibitors, or GLP-1 drugs like semaglutide or tirzepatide without insulin, Medicare will not cover a CGM, regardless of how often you check your blood sugar or how unstable your readings are.

Beyond insulin use, your doctor must document that the CGM is medically necessary for your care. This typically means you have a history of hypoglycemic episodes (low blood sugar), wide swings in blood glucose, or difficulty managing your diabetes with current insulin regimens. Your doctor also must have seen you in person within the 12 months before the order — a telehealth visit counts, but a phone call does not.

If you use an insulin pump, coverage is more straightforward. Medicare assumes pump users benefit from real-time glucose data and usually approves CGMs without extensive documentation of medical necessity.

How to Order a CGM Through Medicare

Start by talking to your doctor. Tell them you want to use a CGM and ask whether they believe it is medically necessary for your diabetes management. If they agree, they will write an order that includes your diagnosis, the specific device they recommend, and a statement that it is medically necessary. Some doctors use a standard form; others write a letter. Either works as long as it includes those elements.

Next, choose a Medicare-enrolled durable medical equipment (DME) supplier. You can search for suppliers on the Medicare website or ask your doctor which suppliers they work with regularly. Call the supplier and give them your doctor's order, your Medicare number, and your contact information. The supplier will verify your coverage, confirm your out-of-pocket costs, and arrange delivery of the device and initial supplies.

The supplier will also handle reorders of sensors and transmitters. Most CGM sensors last 10 to 14 days, depending on the brand, so you will need regular resupply. The supplier manages this automatically once your initial order is set up, though you can change suppliers at any time if you prefer.

What You Pay Out of Pocket

After you meet your Part B deductible for the year, you pay 20% of the Medicare-approved amount for the CGM device, sensors, and transmitter. The deductible is set each year by Medicare — in 2024 it was $240, but confirm the current year's amount with your supplier or on Medicare.gov.

The actual cost to you depends on the device. A starter kit (monitor plus initial sensors) might have a Medicare-approved amount of $300 to $500, meaning you would pay $60 to $100 after your deductible. Sensor refills typically cost $50 to $100 per three-month supply at the 20% coinsurance rate. These are rough ranges; your supplier can quote your exact cost once they verify your coverage.

If you have a Medigap or Medicare Advantage plan, your out-of-pocket costs may be lower. Medigap plans often cover the 20% coinsurance. Medicare Advantage plans vary widely — some cover CGMs fully, others explore different cost-sharing rules. Check your plan documents or call your plan's customer service to confirm what you will pay.

CGM Devices Medicare Covers

Medicare covers several CGM systems, though the list can change. The most commonly covered devices are the Dexcom G6, Dexcom G7, FreeStyle Libre, and Medtronic Guardian. Your doctor chooses which device to prescribe based on your needs and preferences, and Medicare will cover whichever one they order, as long as it is on the covered list.

Each device works slightly differently. Some require fingerstick calibration; others do not. Some send readings to your phone; others use a separate receiver. Some integrate with insulin pumps. Ask your doctor which device they recommend for your situation, and ask the supplier about the practical differences before your device arrives.

If your doctor prescribes a device that is not on Medicare's covered list, Medicare will not pay for it. In that case, you would pay the full cost yourself or check whether the manufacturer offers a patient information program.

Common Reasons Medicare Denies CGM Coverage

The most common denial reason is lack of insulin use. If your claim is denied and you do not use insulin, that is why. Some people then ask their doctor whether starting insulin makes sense for their diabetes management — that is a conversation worth having with your doctor, but it is a medical decision, not just a way to get a CGM.

A second common reason is missing documentation. If your doctor's order does not clearly state that the CGM is medically necessary, or if you have not had a face-to-face visit with your doctor in the past 12 months, Medicare may deny the claim. Ask your doctor to resubmit with clearer language about medical necessity, or schedule a visit if yours is overdue.

A third reason is using a non-enrolled supplier. If you order from a supplier who is not enrolled in Medicare, Medicare will not pay. Always confirm the supplier is Medicare-enrolled before placing an order.

What Happens After Your CGM Arrives

Your supplier will usually include training on how to insert the sensor, read the data, and set alarms. Many suppliers offer phone or video training. Take advantage of it — learning to use the device correctly makes a real difference in how useful it is.

Once you are using the CGM, you can share data with your doctor. Most modern CGMs let you upload readings to a cloud portal that your doctor can access, or you can print reports to bring to appointments. This data helps your doctor adjust your insulin doses and spot patterns you might miss on your own.

If the device stops working or you have problems, contact your supplier first. They handle warranty issues and replacements. If you want to switch to a different device, ask your doctor to write a new order and choose a different supplier or ask your current supplier if they carry the new device.

Frequently Asked Questions

Can I get a CGM if I take a GLP-1 drug like Ozempic or Mounjaro but not insulin?

No. Medicare covers CGMs only for people using insulin. GLP-1 drugs are not insulin, so they do not meet the requirement. If your doctor believes a CGM would help your care, you would need to pay for it yourself or check whether the device manufacturer offers a discount program.

What if my doctor says I need a CGM but I have not seen them in person for over a year?

Schedule a face-to-face visit — in person or by telehealth — before your doctor writes the CGM order. Medicare requires this visit to be within 12 months of the order date. Once you have had the visit, your doctor can write the order and you can proceed with ordering the device.

Do I have to use the supplier my doctor recommends?

No. You can choose any Medicare-enrolled DME supplier. Your doctor writes the order, but you decide which supplier fills it. If you have had good experiences with a particular supplier or want to use one closer to home, you can do that. Just make sure they are enrolled in Medicare before you call.

If I switch from insulin to oral medications, do I lose CGM coverage?

Yes. Once you stop using insulin, Medicare will no longer cover CGM supplies. If you have sensors or transmitters already ordered, contact your supplier to cancel future shipments. If you later restart insulin, you can reorder a CGM by having your doctor write a new order.

How often can I get a new CGM device, not just sensors?

Medicare typically covers a new monitor and transmitter every three years. Sensors are replaced more frequently — usually every 10 to 14 days depending on the device. If your device breaks or malfunctions before three years, contact your supplier about warranty replacement.