Diabetes and Medicare: What's Covered for Insulin, CGMs, Test Strips and Supplies

If you have diabetes and you’re approaching Medicare — or thinking about moving from a Medicare Advantage plan to Original Medicare with a Supplement — you probably have a specific list of questions.

Who pays for my insulin? What about my CGM? Are my test strips covered? What happens to my pump? Will a Medigap plan pay for my supplies?

These matter because Medicare doesn’t put everything diabetes-related into one bucket. Some medications, equipment and supplies fall under Part B. Others fall under Part D. Knowing which is which can change the answer when you’re comparing options.

The simple version: Part B vs Part D

A good starting point:

But — as usual with Medicare — there are exceptions. The biggest involves insulin pumps, where the type of pump you use can determine whether both the pump and the insulin inside it bill to Part B or Part D.

What diabetes supplies does Part B cover?

Part B covers certain diabetes equipment and supplies as durable medical equipment when Medicare’s requirements are met:

• Blood glucose monitors
• Blood glucose test strips
• Lancets and lancet holders
• Glucose control solutions
• Certain continuous glucose monitors (CGMs)
• Supplies associated with covered CGMs
• Certain durable insulin pumps
• Insulin used in a qualifying Part B-covered durable pump

Medicare generally pays 80% of the Medicare-approved amount after the Part B deductible, leaving you responsible for the remaining 20%.

That 20% is exactly why this matters when comparing Original Medicare plus Medigap against Medicare Advantage.

Are CGMs covered by Medicare?

They can be. Part B may cover a continuous glucose monitor and related supplies, including sensors, when Medicare’s eligibility requirements are met.

Generally Medicare requires that you have diabetes and either:

• Take insulin, or
• Have a documented history of certain problems with low blood sugar

Your provider must determine that you qualify and that you or your caregiver have had sufficient training to use the device.

If Part B covers your CGM, standard cost-sharing applies — 80% Medicare, 20% you, after the deductible.

Meters, test strips and lancets

These are generally Part B, not Part D. Part B can cover meters, test strips, lancets, lancet holders and glucose control solutions.

Medicare also has rules about how many supplies it routinely covers. The quantity can differ depending on whether you use insulin, and additional supplies may be covered when medically necessary and properly documented.

There’s a second issue people miss: where you get them. With Original Medicare, make sure your DME supplier is properly enrolled in Medicare, and understand whether the supplier accepts Medicare assignment. Where and how you buy an item affects what Medicare pays and what you owe.

Does Medicare cover insulin?

Yes — but which part covers it depends on how you take it.

Insulin you inject yourself

If you inject with a syringe or pen, the insulin is generally covered through your Part D plan, assuming your plan covers that insulin. Part D may also cover the supplies used to administer it: syringes, needles, alcohol swabs, gauze.

This is worth sitting with for a moment, because it catches people out:

Insulin used in a durable pump

Here’s where it gets interesting. If you use a durable external insulin pump that qualifies as Medicare-covered DME, Part B can cover both the pump and the insulin used in it. That insulin is processed under Part B rather than Part D.

Disposable and patch pumps

These work differently. Part B does not cover disposable insulin pumps as durable medical equipment. Part D may cover certain disposable or patch pumps and the insulin used with them — products such as certain Omnipod or V-Go systems.

That distinction matters enormously. Two people can both say “I use an insulin pump” and have their pump and insulin processed through entirely different parts of Medicare.

Which is why we ask for the actual name of your pump.

Is insulin really capped at $35?

For covered insulin, Medicare limits what you can be required to pay.

A one-month supply of each covered insulin product will generally cost no more than $35, and the deductible does not apply to the insulin itself. For 2026 and later, Part D’s insulin cost-sharing calculation can actually produce an amount below $35 for certain products.

For insulin delivered through a qualifying Part B-covered durable pump, Medicare likewise limits your insulin cost-sharing to no more than $35 for a month’s supply, with the Part B deductible not applying to the insulin.

How does this work with a Medicare Supplement?

This is where people get tangled up. A Medigap plan does not become the primary insurance for your diabetic supplies.

With Medigap you still have Original Medicare Part A and Part B. Medicare pays first. Your Supplement then helps with certain Medicare-approved out-of-pocket costs, according to the plan you hold.

Say Part B approves a CGM. Original Medicare generally pays 80% of the approved amount after the deductible, leaving 20% coinsurance. Depending on which Medigap plan you have, the policy may pay some or all of that Part B cost-sharing.

So the question isn’t “does this Medigap company cover my CGM?” The better question is:

Does Medicare Part B cover my CGM — and if so, how does my specific Medigap plan handle my Part B cost-sharing?

Medigap plans generally follow Medicare’s coverage determination. They aren’t creating a separate network or formulary for your Part B-covered equipment. Your Part D plan is separate, and absolutely does need reviewing for your prescriptions.

What about High-Deductible Plan G?

If you’re considering High-Deductible Plan G, understanding your diabetes expenses becomes especially important.

High-Deductible Plan G doesn’t mean Medicare stops covering your care. Original Medicare still processes covered services and equipment by its own rules. But you’re responsible for Medicare-approved cost-sharing until you satisfy the Medigap plan’s annual high deductible.

Someone regularly using Part B-covered CGMs and DME should understand how quickly those costs contribute to that deductible. It’s a good example of why a Supplement premium shouldn’t be judged in isolation.

How is this different with Medicare Advantage?

Medicare Advantage plans must cover Part A and Part B benefits, but they administer them through the private insurer. That can mean different copays or coinsurance, DME suppliers, pharmacy requirements, networks, prior authorisation rules and plan procedures.

If the plan includes drug coverage, it administers the Part D benefit too. So someone with diabetes may have several separate pieces to evaluate inside a single plan:

This is why someone with diabetes shouldn’t pick a plan on a $0 premium, a dental benefit or an over-the-counter allowance. The medical and prescription coverage you’ll actually use is the thing that matters.

Advantage or Supplement, for someone with diabetes?

There isn’t one answer that’s right for everyone.

Original Medicare + Medigap + Part D: your Part B-covered equipment and supplies process through Original Medicare, your Medigap plan may help with approved Part B cost-sharing, and your prescriptions and Part D-covered supplies run through your separate drug plan.

Medicare Advantage: the plan administers your Medicare-covered medical benefits, and with an MA-PD plan, your drug benefit as well.

The right comparison looks at the entire picture — not the premium.

Don’t forget diabetic shoes and inserts

Part B may also cover therapeutic shoes and inserts for people with diabetes who meet Medicare’s requirements for severe diabetes-related foot disease. When eligible, Medicare can cover either certain custom-molded shoes or extra-depth shoes plus a specified number of inserts.

After the Part B deductible you generally pay 20% of the approved amount under Original Medicare when the supplier accepts assignment — and again, a Medigap policy may help with that cost-sharing.

Give your agent the whole picture

If you have diabetes, don’t hand your agent only a list of prescriptions. Tell us about the equipment too. We want to know:

• Which insulin do you use?
• Pens or syringes?
• Do you use a pump — and which exact one?
• Do you use a CGM, such as Dexcom or FreeStyle Libre?
• Where do you currently get your CGM and supplies?
• Do you use traditional test strips and lancets?
• What other diabetes medications do you take?
• Which doctors and specialists matter to you?
• Which pharmacy do you prefer?

Those details genuinely change how we evaluate your options.

Frequently asked questions

Does Medicare cover a continuous glucose monitor? It can, under Part B, when Medicare’s requirements are met — generally that you have diabetes and either take insulin or have a documented history of certain low-blood-sugar problems.

Is my insulin covered by Part B or Part D? Depends how you take it. Injected by syringe or pen, generally Part D. Delivered through a qualifying durable pump, Part B can cover both pump and insulin. Patch or disposable pumps generally fall to Part D.

Do I still need Part D if I have a Medicare Supplement? Generally yes. Medigap supplements Part A and Part B; it doesn’t replace drug coverage.

Is all my diabetes care capped at $35? No. The cap applies to covered insulin. Pumps, tubing, CGM supplies and test strips follow their own rules.

Are test strips Part B or Part D? Generally Part B, as durable medical equipment — along with meters, lancets and control solutions.

Does Medicare cover diabetic shoes? Part B may cover therapeutic shoes and inserts for people meeting Medicare’s requirements for severe diabetes-related foot disease.

Why does my agent need my pump’s exact name? Because the model determines whether your pump and insulin run through Part B or Part D — and that changes which plan actually suits you.

Let us help you sort it out

Medicare is complicated on its own. Add insulin, CGMs, pumps, DME, Part B, Part D, Advantage and Supplement coverage, and it’s easy to see why people get confused.

We help people understand how their coverage fits together and compare options based on how they actually use their healthcare — not on which plan looks good in a brochure. If you’re approaching eligibility, reviewing current Advantage coverage, or considering a move to Original Medicare with a Supplement, reach out for a free, no-obligation review or call 904-654-5450. Kate Spilsbury (RSSA®, CMIP®) is an independent, licensed agent based in Jacksonville, serving Northeast Florida and Camden County, GA.

Mere Benefits — Simply For Your Benefit.

This article is educational and not medical, tax, or legal advice. Coverage is subject to Medicare eligibility requirements, medical necessity, plan rules and applicable Medicare guidelines. Formularies, pharmacy networks, DME suppliers and plan benefits can change — always verify coverage for your specific medications, equipment and supplies before making a decision. Mere Benefits is not connected with or endorsed by the U.S. government or the federal Medicare program. We don’t offer every plan available in your area.