Does Medicare Cover Insulin Under Part B or Part D?

Coverage at a glance

This block shows who pays for insulin in each case. It uses the fixed coverage columns for this site.

Coverage and costs change. Drug lists (formularies), tiers, and copays can change during the year and differ by plan. Always check with your insurance company or plan directly to confirm what is covered and what you will pay.

• Insulin you inject yourself, with a pen, a vial, or a syringe
• Original Medicare (Parts A and B): Not covered under Part B for self-injected use. Part B is not the payer here.
• Medicare Advantage (Part C): Covered through the plan's drug benefit in most plans. The $35 federal cap sets the most you pay for a covered insulin product; your plan may charge less.
• Medicare Supplement (Medigap): Pays nothing toward this cost. Medigap does not add drug coverage. It pays only toward the gaps in Original Medicare.
• Part D: Covered. You pay no more than $35 for a one-month supply of each covered insulin product. No deductible applies to insulin.
• Also possible: Extra Help can lower drug costs for people with low income. Medicaid and state aid may also help some people.
• Insulin used in a pump
• Original Medicare (Parts A and B): Covered under Part B when the pump is covered durable medical equipment. For the insulin itself, you pay no more than $35 for a one-month supply of each covered insulin product, and no deductible applies to the insulin. The pump itself and its supplies follow the usual Part B cost rule: 20% of the Medicare-approved amount after the Part B deductible.
• Medicare Advantage (Part C): Covered under the plan's Part B rules. Your cost is set by your plan. Check the plan for the exact amount.
• Medicare Supplement (Medigap): Pays part of your cost toward the Original Medicare benefit. If your letter pays your Part B coinsurance, it should cover the cost of the insulin ($35 or less). Many letters also pay some or all of the 20% share for the pump and its supplies. Medigap does not cover the pump insulin by itself.
• Part D: Not the payer for pump insulin. Do not file pump insulin under Part D.
• Also possible: Medicaid may help with costs for people who have both Medicare and Medicaid.
• Insulin given during a covered hospital or skilled nursing stay
• Original Medicare (Parts A and B): Covered under Part A as part of the stay. There is no separate drug bill for drugs given during the stay.
• Medicare Advantage (Part C): Covered as part of the stay under your plan's rules.
• Medicare Supplement (Medigap): Pays part of your cost toward the Part A gaps, based on your letter.
• Part D: Not the payer during a covered stay.
• Also possible: VA benefits may cover insulin for some veterans through VA care.

How you take insulin decides the payer

The rule is based on use, not on the brand. The same insulin can fall under two parts. How you take it is what counts. If the insulin goes into your body by your own hand, it is a self-given drug. Part D is built for drugs you take at home. Pens, vials, and syringes all fit that case. If the insulin is used in a durable pump that Medicare covers as medical equipment, the case changes. The pump is gear that gives the drug over time. A disposable patch pump is different: it is not Part B equipment, and insulin used with it falls under Part D. Part B covers some drugs that are given with gear or by a care team. Pump insulin fits that case. So the first step is not to ask what brand you use. The first step is to ask how the insulin gets into your body. That answer tells you which part to call. It tells you which cost rule to use. It also tells you which list to check.

Insulin under Part D: pens, vials, and syringes

Part D is the drug benefit. You get it from a stand-alone drug plan. Or you get it as part of a Medicare Advantage plan with drug cover. In both cases, the same insulin cap rule holds. For each covered insulin product, you pay no more than $35 for a one-month supply. That cap holds for the full year. It holds in each phase of the benefit. There is no deductible for insulin. You do not have to meet the plan deductible first for insulin. If you use two insulin products, the cap is per product. One product is capped at $35 a month. The second product has its own $35 cap. Your plan must list the insulin on its drug list for the cap to apply. If your insulin is not on the list, ask the plan what form of it is covered. You can also ask for an exception. Your doctor can help with that request. See our guide on what a formulary tier means for your copay for how tiers work.

Insulin under Part B: the pump case

Part B covers insulin that is used in a durable pump covered as medical equipment. Disposable patch pumps are not covered that way; insulin used with them falls under Part D. The pump must be medically needed. Your doctor must order it. The supplier must follow Medicare rules. In this case, Part B cost rules apply, not Part D rules. For the insulin itself, you pay no more than $35 for a one-month supply of each covered insulin product, and no deductible applies to the insulin. The pump itself and its supplies are a different cost: you usually pay 20% of the Medicare-approved amount for them, and the Part B deductible applies first. In 2026, the Part B deductible is $283 for the year. Once you meet it for those device costs, the 20% share is your main device cost for the rest of the year. If you have a Medigap plan, it may pay some or all of that 20% share. That depends on your letter. If your letter pays your Part B coinsurance, it should cover the cost of the insulin ($35 or less). If you are in a Medicare Advantage plan, the $35 cap still sets the most you pay for the insulin itself; your plan sets the cost for the pump device, and it may not be 20%. Read your plan terms or call the plan. The $35 cap is not Part D only. It also sets your cost for insulin used in a Part B-covered pump. The pump device itself runs on the separate Part B device cost rule above. Ask which rule the plan uses before you judge the cost. Our Medicare Supplement hub explains how Medigap pays toward Part B costs.

Sample situation

Rosa is 71 and has type 2 diabetes. She uses two insulin pens at home. Her son, Luis, helps her track her drug costs. Rosa has a stand-alone Part D plan. She feared the cost would rise when her plan's deductible phase began.

Luis called the plan and asked one clear question. He asked how Rosa's insulin is billed. The plan said both pens are on its drug list. Each pen is a covered insulin product. Rosa pays no more than $35 for a one-month supply of each one. She does not have to meet a deductible first for the insulin.

Later, Rosa's doctor raised the idea of a pump. Luis asked how the cost would change. He learned pump insulin is billed under Part B, not Part D. Rosa would pay no more than $35 for a one-month supply of each covered insulin product, with no deductible for the insulin. The pump itself would carry a 20% share after the Part B deductible, unless her other cover paid that share. With both paths clear, Rosa could weigh the pump on health grounds first, then on cost, using the steps in this guide.

What you pay in 2026, and what changes in 2027

For Part D insulin, the $35 cap stays the same in 2027. Medicare lists the cap as $35 per month's supply per product in both years. The wider Part D benefit does change. In 2026, the standard Part D deductible can be up to $615. In 2026, your total out-of-pocket cost for covered drugs is capped at $2,100. Once you reach that cap, you pay $0 for covered drugs for the rest of the year. In 2027, the standard deductible rises to $700. In 2027, the out-of-pocket cap rises to $2,400. These wider figures matter for your other drugs. They do not change the insulin cap. Insulin stays at no more than $35 a month per product, with no deductible. Keep the two ideas apart. One is the insulin rule. It is fixed and simple. The other is the full drug benefit. It shifts a bit each year. When you compare plans this fall, check both. Check that your insulin is on the list. Then check what your other drugs will cost under the new year's caps. The Medicare Advantage hub can help you weigh plans that bundle drug cover.

Insulin during a hospital or skilled nursing stay

There is a third case. It comes up less often, but it can cause mix-ups. If you are in a covered hospital stay, drugs given in the hospital are part of the stay. Part A is the payer. You do not get a separate Part D bill for insulin used in the hospital. The same is true in a covered skilled nursing stay. Drugs given as part of that stay are covered as part of the stay. When you go home, the normal rules return. Your pens go back under Part D. Your pump insulin goes back under Part B. If a bill shows a Part D charge for insulin used during a covered stay, ask for a review. Bills can mix dates. A clear list of your stay dates helps sort it out fast.

Steps to check your own cover

• Write down how you take each insulin: pen, vial, or pump.
• For pens and vials, call your Part D or Advantage plan. Ask if the exact product is on the drug list.
• Ask the plan to confirm the $35 cap in writing or in your plan account.
• For a pump, ask your doctor's office which supplier bills Part B.
• Confirm the $35 monthly cap for the insulin itself, then ask what you will pay for the pump and supplies after the Part B deductible, and if your Medigap letter pays that share.
• If your insulin is not on the list, ask what form is covered and how to seek an exception.
• Recheck each fall. Lists and tiers can change for the next year.

Common traps to avoid

One trap is to shop for insulin by brand alone. Brand matters less than use. A second trap is to think Medigap covers drugs. It does not. Since 2006, Medigap plans have not had drug cover. You need Part D for drugs you take at home. A third trap is to think the $35 cap covers all your diabetes costs. It covers the insulin product. Test strips, pumps, and other gear have their own rules. Ask about each item on its own. A fourth trap is to skip the plan check. The cap helps only if the product is covered by your plan. A short call now can save a long dispute at the drug store. Take notes on the call. Write the date, the name of the person, and what they said. Keep that note with your plan card.

What to do next

• [ ] List each insulin you use and how you take it.
• [ ] Match each one to Part D or Part B using this guide.
• [ ] Call your plan and confirm the product is covered.
• [ ] Confirm your cost: the $35 cap for insulin under Part D or in a Part B-covered pump, plus any 20% share for the pump device itself.
• [ ] Ask if Medigap or other aid pays any of your share.
• [ ] Mark a fall date to recheck your plan's drug list.

Claim-to-source map

• Claim: Insulin you inject yourself is covered under Part D; insulin used in a pump is covered under Part B. Source: Medicare.gov coverage rules for insulin and the Medications coverage map in MEDICARE materials — https://www.medicare.gov/coverage/insulin
• Claim: Part D covered insulin costs no more than $35 per month's supply per product, with no deductible. Source: Verified Figures Ledger A12 and A20, from Medicare.gov Part D costs — https://www.medicare.gov/basics/costs/help/drug-costs
• Claim: Insulin used in a Part B-covered pump costs no more than $35 per month's supply per product, with no deductible for the insulin; the pump device and supplies follow the general Part B rule of usually 20% of the Medicare-approved amount after the deductible (Verified Figures Ledger A16). Source: Medicare.gov insulin coverage and Costs pages — https://www.medicare.gov/coverage/insulin
• Claim: The 2026 Part B deductible is $283. Source: Verified Figures Ledger A2, CMS 2026 Parts A and B fact sheet — https://www.medicare.gov/basics/costs/medicare-costs
• Claim: The 2026 Part D standard deductible is up to $615 and the 2026 out-of-pocket cap is $2,100. Source: Verified Figures Ledger A9 and A10 — https://www.medicare.gov/basics/costs/help/drug-costs
• Claim: The 2027 Part D standard deductible is $700 and the 2027 out-of-pocket cap is $2,400. Source: Verified Figures Ledger A17 and A18, CMS CY2027 Rate Announcement — https://www.medicare.gov/basics/costs/help/drug-costs
• Claim: Drugs given during a covered inpatient stay are covered as part of the stay under Part A. Source: Medications category coverage map, Medicare.gov rules — https://www.medicare.gov/coverage/insulin
• Claim: Medigap does not include prescription drug coverage and pays only toward Original Medicare gaps. Source: Medicare Supplement spec, Medicare.gov Medigap rules — https://www.medicare.gov/health-drug-plans/medigap