How to Get a Freestyle CGM Through Medicare Part B

Walmart cannot sell you a Freestyle CGM as a Medicare Part B benefit

Medicare Part B covers continuous glucose monitors (CGMs) like the FreeStyle Libre, but only when prescribed by a doctor and dispensed through a pharmacy or durable medical equipment (DME) supplier — not through Walmart's retail counter. Walmart does sell the FreeStyle Libre without insurance, but that purchase does not count toward Medicare coverage. If your doctor prescribes a CGM, Medicare will pay its share only if the device comes from a Medicare-enrolled pharmacy or DME company.

The distinction matters because Medicare's payment rules are strict about where the device originates. A Walmart purchase is a retail transaction; a Medicare-covered CGM is a medical device ordered through the healthcare system. You cannot buy it at Walmart and then submit the receipt to Medicare for reimbursement.

Key Takeaways

Medicare Part B covers the FreeStyle Libre and other CGMs only when your doctor writes a prescription and the device comes from a Medicare-enrolled pharmacy or DME supplier.
Walmart sells the FreeStyle Libre without a prescription, but that retail purchase is not a Medicare-covered transaction.
Your out-of-pocket cost through Medicare is typically 20% of the approved amount after you meet your Part B deductible, not the retail price Walmart charges.
You must use a Medicare-enrolled supplier; the device cannot be purchased at retail and resubmitted for Medicare payment.
If your doctor prescribes a CGM, ask them which Medicare-enrolled suppliers they work with, or call Medicare at 1-800-MEDICARE to find one in your area.

What Medicare Part B covers for CGMs

Medicare Part B covers continuous glucose monitors for people with diabetes who meet specific medical criteria. The FreeStyle Libre, Dexcom G6, Dexcom G7, and Medtronic Guardian are among the devices Medicare recognizes. Coverage includes the sensor itself and, in some cases, the reader device you use to check your glucose levels.

To be covered, you must have a prescription from your doctor stating that you have diabetes and that a CGM is medically necessary for your care. Your doctor may need to document that you use insulin or that you have frequent episodes of low blood sugar. The exact requirements depend on the specific device and your situation.

How to get a CGM through Medicare instead of buying at Walmart

Start by talking to your doctor about whether a CGM makes sense for your diabetes management. If your doctor agrees, ask them to write a prescription and tell you which Medicare-enrolled suppliers they work with. Many doctors have relationships with specific DME companies or pharmacies that handle CGM orders regularly.

If your doctor does not have a supplier recommendation, call Medicare at 1-800-MEDICARE and ask for a list of Medicare-enrolled suppliers in your area that carry the CGM your doctor prescribed. You can also search the Medicare Supplier Directory online at dmepos.cms.gov. Once you have a supplier, contact them with your prescription, and they will handle the paperwork with Medicare.

The supplier will verify your coverage, confirm that you meet Medicare's requirements, and arrange for the device to be shipped to you or picked up. This process usually takes one to two weeks. You will pay your Part B coinsurance (typically 20% of the approved amount) after you meet your annual deductible.

The cost difference between Walmart and Medicare

Walmart's retail price for a FreeStyle Libre sensor pack varies but is often higher than what Medicare pays. When you buy at Walmart without insurance, you pay the full retail price upfront. Through Medicare, you pay only your coinsurance share — usually 20% of Medicare's approved amount — after your Part B deductible.

For example, if Medicare's approved amount for a month's supply of sensors is $100, you would pay $20 (your 20% coinsurance) after meeting your deductible. The supplier bills Medicare for the rest. The exact approved amount varies by device and region, so ask your supplier what your out-of-pocket cost will be before you start.

If you have a Medigap or Medicare Advantage plan, your coinsurance may be lower or covered entirely. Check your plan documents or call your plan's customer service to understand your specific costs.

What happens if you buy the FreeStyle Libre at Walmart instead

Buying the FreeStyle Libre at Walmart is a straightforward retail purchase — you pay the full price and own the device. Medicare will not reimburse you for a retail purchase, even if you have a prescription from your doctor. The transaction does not go through the Medicare system, so there is no claim to submit.

Some people choose to buy at Walmart because they want the device when ready and do not want to wait for the Medicare process. Others do it because they are not sure whether Medicare will cover them and want to avoid delays. If cost is your concern, it is worth asking your doctor and a Medicare supplier what your actual out-of-pocket expense would be, because it may be less than the Walmart retail price.

Frequently Asked Questions

Can I buy a FreeStyle Libre at Walmart and then ask Medicare to pay for it?

No. Medicare only covers CGMs that come from Medicare-enrolled suppliers. A retail purchase at Walmart is not a Medicare transaction, and you cannot submit a Walmart receipt for reimbursement. You must order through a Medicare-enrolled pharmacy or DME supplier from the start.

Does my Medicare Advantage plan cover CGMs the same way?

Medicare Advantage plans must cover at least what Original Medicare covers, but they may have different rules about which suppliers you can use or what your coinsurance is. Contact your plan directly to ask whether they cover the CGM your doctor prescribed and which suppliers are in-network.

What if my doctor says I do not meet Medicare's requirements for a CGM?

Medicare has specific medical criteria for CGM coverage, and not everyone with diabetes qualifies. If your doctor says you do not meet them, you can ask your doctor to appeal to Medicare with additional medical information, or you can buy the device at Walmart or another retailer out of pocket. You can also ask Medicare directly whether you meet the criteria by calling 1-800-MEDICARE.

How long does it take to get a CGM through Medicare?

Once your doctor sends the prescription to a Medicare-enrolled supplier, the process usually takes one to two weeks. The supplier verifies your coverage with Medicare, confirms you meet the requirements, and arranges shipment. Walmart can sell you one the same day, but you pay full retail price.

Can I use any pharmacy or DME supplier, or does it have to be a specific one?

You can use any Medicare-enrolled supplier that carries the CGM your doctor prescribed. Ask your doctor for a recommendation, or search the Medicare Supplier Directory at dmepos.cms.gov. Different suppliers may have slightly different processes, but all Medicare-enrolled suppliers follow the same coverage rules.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.