Medicare covers some diabetes supplies, but not all of them, and the coverage splits between Part B and Part D depending on what you need

Medicare Part B covers certain diabetes equipment and monitoring supplies when prescribed by your doctor: blood glucose meters, test strips, lancets, and lancing devices. It also covers continuous glucose monitors (CGMs) if you meet specific criteria. Medicare Part D (prescription drug coverage) covers insulin and oral diabetes medications, but only if your plan includes them on its formulary — the list of drugs it will pay for.

The catch is that coverage rules are strict about what counts as medically necessary, and you will hit a coverage gap called the donut hole if you spend enough on Part D drugs. Supplies like lancets and test strips have quantity limits. Insulin pumps and their supplies fall under Part B but require prior approval from Medicare before you order them.

What you actually pay depends on which parts of Medicare you have, whether you have a Medigap or Medicare Advantage plan layered on top, and which specific items and brands your doctor prescribes.

Key Takeaways

  • Medicare Part B covers blood glucose meters, test strips, lancets, and some continuous glucose monitors when your doctor prescribes them, but you pay 20 percent coinsurance after you meet your Part B deductible.
  • Medicare Part D covers insulin and diabetes pills, but only the drugs on your plan's formulary, and you will pay more once you enter the donut hole coverage gap.
  • Insulin pumps and pump supplies require prior authorization from Medicare before you order them, and approval can take one to two weeks.
  • Quantity limits explore to test strips and lancets — Medicare typically covers one test strip per finger stick and one lancet per test, which may not match your doctor's recommended testing schedule.
  • If your plan denies a supply or medication, you can request an appeal, and your doctor can submit documentation of medical necessity to support your case.

What Part B Covers: Meters, Strips, Lancets, and Monitors

Medicare Part B covers diabetes testing supplies as durable medical equipment (DME) when your doctor writes an order. This includes blood glucose meters, test strips, lancets, and lancing devices. You do not pay anything for the meter itself if you get it from a Medicare-approved DME supplier — Medicare covers the full cost. For test strips and lancets, you pay 20 percent coinsurance after you have met your Part B deductible (which is $240 in 2024, though this amount changes yearly).

Continuous glucose monitors (CGMs) are also covered by Part B, but Medicare has strict rules about who qualifies. You must have diabetes treated with insulin, and your doctor must document that you check your blood sugar at least four times daily or use an insulin pump. If you meet these criteria, Medicare covers the monitor and the sensors, again at 20 percent coinsurance after your deductible.

The quantity limits are where many people run into problems. Medicare typically covers one test strip per finger stick and one lancet per test. If your doctor recommends testing six times daily, Medicare will cover supplies for six tests per day — but if you test more often, you pay out of pocket for the extras. Some people find they need more strips than Medicare's quantity allows and end up buying additional strips themselves.

What Part D Covers: Insulin and Diabetes Medications

Medicare Part D is the prescription drug benefit, and it covers insulin and oral diabetes medications — but only if your specific plan includes them. Each Part D plan publishes a formulary listing which drugs it covers and at what cost tier. Insulin is usually covered, but the brand, type, and dosage your doctor prescribes may not be on your plan's formulary, or it may be on a higher cost tier that requires you to pay more.

When you first enroll in Part D, you pay a copay or coinsurance for each prescription. Once your total out-of-pocket spending reaches a certain threshold (which varies by year and plan), you enter the coverage gap, sometimes called the donut hole. In the donut hole, you pay a higher percentage of the drug cost — typically 25 percent for most drugs, though insulin has a $35 copay cap per month as of 2024. Once your out-of-pocket costs reach the catastrophic threshold, Medicare covers 95 percent of the cost for the rest of the year.

If your plan does not cover the insulin or medication your doctor prescribed, you can ask your doctor to request a formulary exception — a formal request for Medicare to cover a drug not on the plan's list. This usually takes a few days to a week, and your doctor needs to document medical reasons why you need that specific drug instead of alternatives on the formulary.

Insulin Pumps and Pump Supplies

Insulin pumps and their supplies — infusion sets, reservoirs, and batteries — are covered by Medicare Part B as DME. However, Medicare requires prior authorization before you order a pump. Your doctor must submit documentation showing that you have type 1 diabetes or type 2 diabetes treated with insulin, that you have been on insulin for at least three months, and that you have seen an endocrinologist or diabetes specialist within the past year (or have a documented reason why you have not).

Prior authorization typically takes one to two weeks. Once approved, you order the pump from a Medicare-approved DME supplier, and you pay 20 percent coinsurance after your Part B deductible. Pump supplies — the infusion sets and reservoirs you replace every few days — are also covered at 20 percent coinsurance, but Medicare limits the quantity. Most plans cover enough supplies for one set change every three days, which may not match your actual usage if you change sets more frequently.

If Medicare denies your pump request, your doctor can appeal the decision by submitting additional clinical documentation. Appeals can take several weeks, so starting the process early is important if you are planning to switch to pump therapy.

The Donut Hole and How It Affects Your Costs

The Part D donut hole is a coverage gap that kicks in once you and your plan have spent a combined $5,850 on covered drugs in 2024 (this threshold changes yearly). Once you enter the donut hole, you pay 25 percent of the cost for most drugs, though insulin has a $35 monthly copay cap. You stay in the donut hole until your out-of-pocket spending reaches $7,050 (also 2024 figures), at which point catastrophic coverage begins and Medicare covers 95 percent of costs.

For someone on insulin, the donut hole can mean a sudden jump in what you pay per month. If you take multiple diabetes medications or high-cost insulin, you can reach the donut hole by mid-year. Some people respond by skipping doses or rationing medication to stay under the threshold, which is dangerous. Instead, talk to your doctor about whether a lower-cost insulin or medication on your plan's formulary might work for you, or ask your plan about patient information programs that some drug manufacturers offer.

If you have limited income, you may may have access to for the Low-Income Subsidy (LIS), which reduces your Part D costs and eliminates the donut hole. You can check whether you may have access to by contacting Social Security or your local Medicaid office.

Medicare Advantage Plans and Supplemental Coverage

If you have a Medicare Advantage plan (Part C) instead of Original Medicare, your diabetes coverage works differently. Medicare Advantage plans must cover at least what Original Medicare covers, but they often have different copays, deductibles, and quantity limits. Some Advantage plans cover more supplies or have lower copays for diabetes medications than Original Medicare does. You need to check your specific plan's formulary and coverage rules.

If you have a Medigap (supplemental insurance) plan, it helps pay the coinsurance and deductibles that Original Medicare leaves you responsible for. For diabetes supplies covered by Part B, Medigap can reduce your 20 percent coinsurance to a much lower amount or eliminate it entirely, depending on which Medigap plan you have. Medigap does not cover Part D drugs, so the donut hole still applies to your medications.

What Is Not Covered

Medicare does not cover certain diabetes-related items that many people need. Glucose tablets, gel, or other fast-acting carbohydrates for treating low blood sugar are not covered — you pay out of pocket. Diabetes education classes are covered by Medicare if your doctor refers you to a certified diabetes educator, but only once per year (or twice if you are newly diagnosed). Nutritionist visits for diabetes meal planning are not covered unless they are part of a covered diabetes education program.

Certain brands of meters, strips, or monitors may not be covered if they are not on Medicare's approved list. If your doctor prescribes a specific brand that Medicare does not cover, you can either switch to an approved brand or pay out of pocket for the one your doctor recommended. Ask your DME supplier which brands are covered under your plan before you order.

How to Find Out What Your Specific Plan Covers

The easiest way to learn what your plan covers is to call the customer service number on the back of your Medicare card. Have your prescription list and your doctor's name ready. Ask specifically: Does my plan cover my insulin? What is the copay? Are my test strips covered, and how many per month? Does my plan cover a continuous glucose monitor?

You can also check your plan's website, which usually has a drug search tool where you can type in the name of your medication and see the copay and any restrictions. For DME like meters and strips, call your plan and ask which suppliers are in-network — using an out-of-network supplier means you pay more.

If you are not yet on Medicare or are in your initial enrollment period, use Medicare.gov's Plan Finder tool to compare plans side by side based on your current medications and supplies. This tool shows you the estimated annual cost for each plan, which helps you pick the one that works best for your diabetes care.

Frequently Asked Questions

Can I get a continuous glucose monitor if I do not use an insulin pump?

Yes. Medicare covers CGMs for people on insulin therapy who check their blood sugar at least four times daily. You do not need a pump. Your doctor must document your testing frequency and submit the prior authorization request to Medicare.

What happens if my plan stops covering my insulin brand?

Plans can change their formularies each year. If your insulin is removed, your plan must give you notice, and you can request a formulary exception. Your doctor can also ask for a transition period to switch you to a covered insulin. If the exception is denied, you can appeal or switch to a different Part D plan during the annual enrollment period.

Do I have to pay for test strips if I test more than Medicare allows?

Yes. Medicare's quantity limits are based on testing frequency, not actual need. If you test more often than the limit allows, you pay the full cost for extra strips out of pocket. Some people use a combination of covered strips and out-of-pocket strips to meet their testing needs.

Can my doctor override Medicare's quantity limits for supplies?

Your doctor can request a quantity exception by submitting documentation of medical necessity to Medicare. This takes time and is not always approved, but it is worth asking if you need more supplies than the standard limit allows.

What should I do if Medicare denies coverage for a supply my doctor prescribed?

Ask your doctor to submit an appeal with clinical documentation explaining why you need that specific supply. You can also file your own appeal by contacting your plan or Medicare directly. Appeals must be filed within 60 days of the denial notice.