Medicare Part B covers FreeStyle Libre glucose monitors, but only under specific conditions

Medicare Part B will pay for a FreeStyle Libre reader and sensors if your doctor prescribes them and you meet the program's requirements. The coverage is not automatic — you need a prescription from your doctor stating that you have diabetes and require continuous glucose monitoring, and you must use a Medicare-approved supplier to obtain the device. Part B treats the reader and sensors as durable medical equipment, which means you pay a portion of the cost through your deductible and coinsurance.

The amount Medicare pays depends on whether you have already met your Part B deductible for the year. Once you have, Medicare typically covers 80 percent of the approved amount, and you pay the remaining 20 percent. If you have not met your deductible, you pay the full cost of the deductible first, then the 20 percent coinsurance on top.

Key Takeaways

  • Your doctor must write a prescription for continuous glucose monitoring, and the prescription must state that you have diabetes and need the device to manage your condition.
  • You must order the FreeStyle Libre through a Medicare-approved durable medical equipment supplier, not directly from the manufacturer or a retail pharmacy.
  • Medicare covers both the reader device and the sensors, but you pay 20 percent coinsurance after you meet your Part B deductible.
  • The reader is covered once every three years, and sensors are covered based on your prescription — typically one sensor per month or as your doctor prescribes.

How to get a prescription from your doctor

Start by scheduling an appointment with the doctor who manages your diabetes — this is usually your primary care doctor, endocrinologist, or diabetes educator. Bring your current blood sugar logs or meter readings if you have them, and be ready to explain why you think continuous glucose monitoring would help you manage your diabetes. Your doctor will decide whether continuous glucose monitoring is medically necessary for your situation.

If your doctor agrees, they will write a prescription that includes your diagnosis (type 1 or type 2 diabetes), the specific device (FreeStyle Libre), and the frequency of sensor replacement your doctor thinks you need. The prescription goes to the durable medical equipment supplier, not to a pharmacy. Your doctor's office can send it directly, or you can pick up a paper copy and send it yourself.

Finding a Medicare-approved supplier

You cannot buy a FreeStyle Libre directly from Abbott (the manufacturer) or from a retail pharmacy and expect Medicare to pay. You must use a supplier that Medicare has enrolled and approved to sell durable medical equipment. The easiest way to find one is to search the Medicare Supplier Directory at dmepos.cms.gov. Enter your ZIP code and search for "continuous glucose monitoring" or "glucose monitors." The directory will show you suppliers in your area, their contact information, and whether they are currently accepting new patients.

Call at least two suppliers before you choose one. Ask whether they accept Medicare assignment (meaning they bill Medicare directly and you only pay your coinsurance), how long delivery usually takes, and whether they offer customer support if the device malfunctions. Some suppliers are faster or more responsive than others, and this matters because you do not want to run out of sensors while waiting for a replacement order.

What happens after you order

Once you have chosen a supplier and sent your prescription, the supplier will verify your Medicare coverage and contact you about payment. They will tell you what your deductible status is and what you owe out of pocket. If you have not met your Part B deductible, you will pay the full deductible amount first. After that, you pay 20 percent of the Medicare-approved amount for the reader and for each sensor.

The supplier ships the reader and your first set of sensors to your home. Delivery usually takes one to two weeks, though this varies by supplier. The supplier should also provide instructions on how to use the device. If you have questions after it arrives, contact the supplier's customer service line — they can troubleshoot problems or arrange a replacement if the device is defective.

Sensor refills and the three-year reader rule

After you receive your first reader, Medicare will cover a replacement reader only once every three years. However, sensors are covered more frequently — typically one sensor per month, or whatever frequency your doctor prescribes. You will need to reorder sensors from your supplier on a regular schedule, usually monthly.

Each time you reorder sensors, the supplier will bill Medicare and you will pay your 20 percent coinsurance (assuming you have met your deductible). Keep track of when you received your reader, because if you need a replacement before three years have passed, Medicare will deny the claim and you will have to pay out of pocket.

What Medicare does not cover

Medicare Part B does not cover lancets, test strips for fingerstick testing, or lancing devices — those are covered under Part D (prescription drug coverage) if your plan includes them. Part B also does not cover the FreeStyle Libre if you do not have a prescription, if your supplier is not Medicare-approved, or if you have already received a reader within the past three years.

If you have a Medigap or Medicare Advantage plan, your supplemental coverage may reduce your out-of-pocket cost, but the rules vary by plan. Contact your supplemental plan directly to ask whether they cover the 20 percent coinsurance for glucose monitors.

Frequently Asked Questions

Do I need prior authorization before I order?

Some Medicare Advantage plans require prior authorization, but Original Medicare Part B does not. However, your supplier may contact Medicare on your behalf to verify coverage before they ship the device. This is normal and usually takes a few days. If you have a Medicare Advantage plan, call your plan first to ask whether you need approval before ordering.

What if my doctor says I need more than one sensor per month?

Medicare will cover the frequency your doctor prescribes. If your doctor writes that you need two sensors per month, the supplier will bill for two. You will need to provide documentation of medical necessity if Medicare questions the frequency, so ask your doctor to note in the prescription why you need more sensors than the standard monthly amount.

Can I use my FreeStyle Libre with a different phone or app?

The FreeStyle Libre reader is a standalone device and does not require a phone or app to work. You can also use the FreeStyle Libre app on a compatible smartphone if you choose, but the app is optional. Medicare covers the reader itself, not the app or any smartphone you might use with it.

What if I have a gap in my Medicare coverage?

If your Part B coverage lapses, Medicare will not pay for sensors or a replacement reader during that gap. If you need sensors while uninsured, contact your supplier about paying out of pocket, or ask your doctor whether there are other glucose monitoring options available to you during the gap.

Does Medicare cover the FreeStyle Libre 3?

Medicare covers FreeStyle Libre continuous glucose monitoring devices that are FDA-approved and prescribed by your doctor. Coverage rules are the same regardless of which version of the FreeStyle Libre your doctor prescribes. Confirm with your supplier that the specific model your doctor wants is in stock and that they can ship it to you.