Medicare covers Dexcom G7 for most people with diabetes, but only if your doctor prescribes it and you meet specific requirements
Dexcom G7 is a continuous glucose monitor (CGM) — a small sensor you wear on your skin that checks your blood sugar throughout the day and sends readings to your phone or receiver. Medicare Part B covers the sensor, transmitter, and receiver for people with diabetes who use insulin, but the coverage rules are strict about who qualifies and what paperwork your doctor must file.
The key requirement is that your doctor must prescribe the device and document that you are using insulin therapy. Medicare will not cover Dexcom G7 for people who manage diabetes with diet, oral medication, or non-insulin injections alone. If you meet that requirement, Medicare typically covers 80 percent of the approved amount after you have paid your Part B deductible, and you pay the remaining 20 percent as coinsurance.
Key Takeaways
- Medicare Part B covers Dexcom G7 only for people with diabetes who use insulin, and your doctor must write a prescription and submit documentation to Medicare.
- You must meet your Part B deductible before coverage begins, and then Medicare pays 80 percent while you pay 20 percent coinsurance.
- Your doctor's office handles the prior authorization request, which can take one to two weeks, so start the process as soon as your doctor agrees to prescribe it.
- If Medicare denies coverage, you have the right to request a reconsideration, and Dexcom's patient support team can help you gather the medical records your doctor needs.
What Medicare requires before it will cover Dexcom G7
Your doctor must prescribe Dexcom G7 and submit a prior authorization request to Medicare before you can receive the device. Prior authorization means Medicare reviews your medical records to confirm you meet the coverage rules. Your doctor's office typically handles this step, but you should call them to confirm they have submitted the request and ask how long it usually takes — most offices complete it within one to two weeks.
Medicare requires documentation that you use insulin therapy. This can be insulin injections, an insulin pump, or insulin infusions. If you take other diabetes medications but not insulin, Medicare will deny the request. Your doctor's records should already show your insulin use, but if you have recently started insulin, make sure your doctor has updated your chart before they submit the prior authorization.
You must also have Part B coverage active at the time your doctor submits the request. If you have not yet enrolled in Part B or your coverage has lapsed, contact Medicare to restore it before your doctor files the paperwork.
How much you will pay out of pocket
Your costs depend on whether you have met your Part B deductible for the year. The Part B deductible amount changes each year — you can find the current year's amount on Medicare.gov or by calling 1-800-MEDICARE. Once you have paid this deductible through other Part B services or supplies, Medicare begins to pay its share.
After you meet the deductible, Medicare pays 80 percent of the approved amount for Dexcom G7, and you pay 20 percent coinsurance. The approved amount is set by Medicare, not by Dexcom's retail price, so your actual cost may be lower than the list price. Dexcom sensors need to be replaced every 10 days, so your coinsurance will recur monthly.
If you have a Medigap or Medicare Advantage plan, your out-of-pocket costs may be lower. Medigap plans often cover the 20 percent coinsurance, and Medicare Advantage plans vary — contact your plan directly to learn what you will pay for Dexcom G7.
What happens if Medicare denies your request
If Medicare denies coverage, your doctor's office will receive a denial letter explaining the reason. The most common reasons are that your records do not show insulin use, your prior authorization request was incomplete, or Medicare determined the device was not medically necessary based on your chart.
You have the right to request a reconsideration within 180 days of the denial date. Your doctor can submit additional medical records or a letter explaining why Dexcom G7 is medically necessary for you. Dexcom's patient support team (1-844-DEXCOM-1) can help you and your doctor gather the information Medicare needs, including records of your blood sugar readings, hospitalizations, or diabetes complications that support the medical need.
If the reconsideration is also denied, you can file a formal appeal with Medicare. This process is longer but gives you another chance to present your case. Your doctor or a patient advocate can help you prepare the appeal.
How to start the process with your doctor
Schedule an appointment with your doctor and tell them you are interested in using Dexcom G7. Bring your insurance card and any recent blood sugar logs or diabetes records you have. Your doctor will review whether Dexcom G7 is appropriate for your diabetes management and whether you meet Medicare's insulin requirement.
If your doctor agrees to prescribe it, ask them to submit the prior authorization request to Medicare right away. Confirm with their office that the request has been sent and ask for an expected approval date. While you wait, you can contact Dexcom directly to learn about the device, how to wear it, and what to expect when it arrives.
Once Medicare approves the request, your doctor will send the prescription to Dexcom or to a durable medical equipment (DME) supplier that Medicare has approved. Dexcom will contact you to confirm your shipping address and answer any setup questions. The first sensor usually arrives within one to two weeks after approval.
What to do if you do not use insulin
If you manage your diabetes without insulin, Medicare will not cover Dexcom G7 under Part B. However, you have other options. You can purchase Dexcom G7 out of pocket — the retail price varies, but Dexcom offers a patient information program for people without insurance or with high out-of-pocket costs. Contact Dexcom directly to learn whether you may have access to.
Some Medicare Advantage plans cover CGMs for people who do not use insulin, so if you are enrolled in an Advantage plan, contact your plan to ask about coverage. A few state Medicaid programs also cover CGMs for non-insulin users, though this varies by state.
Talk to your doctor about whether a CGM would help you manage your diabetes, even if Medicare does not cover it. Your doctor may have samples or know about other funding sources.
Common issues that delay or block coverage
Incomplete prior authorization paperwork is the most common reason approvals take longer than expected. Make sure your doctor's office has submitted all required documents, including your current insulin prescription and recent blood sugar records. If you have not seen your doctor recently, schedule an appointment so they can review your current diabetes management and update your medical record.
Another frequent issue is that Medicare's records do not match your doctor's records. If you have recently switched doctors or started insulin at a different clinic, Medicare may not have the updated information. Ask your current doctor to request your records from your previous provider and include them in the prior authorization submission.
If you have a Medicare Advantage plan instead of Original Medicare, the approval process may be different. Contact your Advantage plan directly to ask about their coverage rules for Dexcom G7, because some plans require different documentation or have their own prior authorization process.
Frequently Asked Questions
Do I need to use a specific type of insulin for Medicare to cover Dexcom G7?
No. Medicare covers Dexcom G7 for anyone using any form of insulin therapy — injections, pens, pumps, or infusions. The requirement is that you use insulin, not which insulin or how often you use it.
Can I get Dexcom G7 while I am waiting for Medicare's decision?
Yes, you can purchase it out of pocket or through Dexcom's patient information program while your prior authorization is pending. Once Medicare approves coverage, you can submit receipts to Medicare to request reimbursement, though reimbursement is not may provide and depends on Medicare's rules. Ask Dexcom about their reimbursement process before you purchase.
What if my doctor says I do not need Dexcom G7?
You can ask your doctor to explain their reasoning and discuss whether a CGM might help you manage your blood sugar better. If you disagree, you can seek a second opinion from another endocrinologist or diabetes specialist. Medicare will only cover the device if your doctor prescribes it, so finding a doctor who supports its use is necessary.
How often do I need to reorder sensors, and will I have to go through prior authorization again?
Sensors last 10 days and need to be replaced every month. Once Medicare approves Dexcom G7, you typically do not need another prior authorization for refills — your doctor sends new prescriptions to Dexcom or your DME supplier as needed. However, confirm this with your doctor's office and with Dexcom when your first sensor arrives.
Does Medicare cover the transmitter and receiver, or just the sensor?
Medicare covers the sensor, transmitter, and receiver as part of the same benefit. You will pay coinsurance on the total approved amount for all three components. The transmitter lasts about three months and the receiver lasts several years, so your monthly costs are primarily for the sensor replacements.