What's the Best Medicare Plan for Someone With Diabetes? A Broker's Honest Answer

How Original Medicare covers diabetes supplies and medications

Part B covers blood glucose monitors, test strips, lancets, and insulin pumps at 80% after your $283 annual deductible (2026). It also covers diabetes self-management training and A1C tests up to twice a year at no cost.

Part D handles oral diabetes medications and insulin pens/vials. Since 2025, insulin copays are capped at $35/month per covered product. That cap applies to both standalone Part D and Medicare Advantage drug plans.

Medigap vs. Advantage: which controls out-of-pocket costs better

• Medigap (Plan G or N) + Part D: You see any Medicare-accepting doctor nationwide. Plan G covers the Part A deductible ($1,676 in 2026) and all Part B coinsurance. You pay the Part B deductible, then essentially nothing else for Medicare-covered services.
• Medicare Advantage (Part C): Often $0 premium with drug coverage built in. But you're locked into a network, and copays for specialist visits and supplies add up if you need frequent endocrinology visits, lab work, and device fittings.

If your diabetes care involves multiple specialists and frequent supply orders, Medigap usually gives you more predictable costs. Advantage can work well if you're stable on oral medications with fewer providers.

Part D formulary traps that hit diabetics hardest

Not all Part D plans cover every insulin brand or CGM sensor at the same tier. Switching from Humalog to Novolog might save you $200 a year on one plan but cost more on another. Always check the formulary before you enroll.

Watch for step therapy and prior authorization requirements on newer medications like Ozempic or Mounjaro. Some plans force you to try metformin or a sulfonylurea first, even if your endocrinologist disagrees.

How to pick the right plan based on your specific medications

Start with your medication list. Every drug, every dose, every device. Then compare Part D plans on medicare.gov's Plan Finder or call us. We run your exact prescriptions through every available plan to find your lowest annual cost.

A broker does this for free. We're not guessing. We're running the numbers.

CGM and pump coverage: what Medicare actually pays

Medicare Part B covers continuous glucose monitors (like Dexcom and Libre) as durable medical equipment when prescribed by your doctor. You pay 20% after the deductible unless you have a Medigap plan that picks up that coinsurance.

Insulin pump supplies also fall under Part B. If you're on a pump and a CGM, your 20% coinsurance adds up fast without supplemental coverage.

The enrollment window matters more than you think

Your Medigap Open Enrollment Period starts the month you turn 65 and are enrolled in Part B. During those six months, no insurer can deny you or charge extra because of diabetes. Miss that window and underwriting kicks in. That can mean higher premiums or outright denial.

For Medicare Advantage and Part D, Open Enrollment runs October 15 through December 7 each year. Review your plan annually because formularies change.

Related resources

• Medicare Supplement Plan G: Full Breakdown
• Medicare Advantage vs. Medigap: Which Is Right for You?
• Medicare Part D Enrollment: What You Need to Know
• Medicare Open Enrollment Period Explained