Medicare Insulin Copay Cap: $35 Limit in 2026

If you have Medicare drug coverage in 2026, a one-month supply of each covered insulin product costs no more than $35, and you do not pay a deductible for that insulin.[1] The same monthly ceiling applies to insulin used with a traditional pump under Part B, and Medicare Advantage plans that cover insulin follow the same patient-cost rule.[2] That is the federal Medicare insulin copay cap. It is a per-product monthly limit on covered insulin, not the yearly Part D out-of-pocket cap, and it does not apply to GLP-1 weight-loss drugs.

What the Medicare insulin copay cap is in 2026

The cap comes from the Inflation Reduction Act. For Part D, it took effect on January 1, 2023. For insulin used in a durable pump under Part B, it took effect on July 1, 2023.[3][7] A CMS model had tested a similar $35 monthly insulin copay in participating plans. The law later applied the protection to covered insulin in all Part D plans.[7]

Medicare’s consumer page states the rule in plain language: the cost of a one-month supply of each Part B- and Part D-covered insulin product is no more than $35, and you do not have to pay a deductible for insulin. If you get a three-month supply, your costs cannot be more than $35 for each month’s supply of each covered insulin product, so you will generally pay no more than $105 for a three-month supply of one covered insulin.[1] A two-month fill follows the same math. You generally pay no more than $70 for a two-month supply of one covered insulin product.[12]

That “each” word matters. If your doctor has you on two different covered insulins, such as a long-acting insulin and a mealtime insulin, the cap applies to each product. You could owe up to $35 for each one-month fill, not $35 for all of your insulin combined.[1]

For 2026, CMS also codified a slightly more precise Part D formula. The Part D deductible still does not apply to covered insulin. The cost-sharing amount for a one-month supply of each covered insulin product must not exceed the “applicable” amount, which is the lesser of $35, 25 percent of the maximum fair price if Medicare has negotiated a price for that insulin, or 25 percent of the plan’s negotiated price.[3][4] In practice, $35 remains the ceiling you will hear at the pharmacy. Some fills may come in below $35 if 25 percent of the plan’s price (or of a negotiated maximum fair price) is lower. The law does not let a plan charge more than that applicable amount for a month’s supply of a covered insulin product before you reach the yearly out-of-pocket threshold.[4][9]

HHS’s Assistant Secretary for Planning and Evaluation reported in July 2026 that average monthly out-of-pocket spending for insulin among Medicare users fell from $42.79 in 2018 to $12.04 in 2025, a 72 percent decline.[6] That average is not a promise of your exact copay. It does show that insulin costs for people with Medicare have become more predictable than they were several years ago. CMS has also noted that more than 3.3 million people with Medicare use one or more of the common forms of insulin.[7]

Which insulin the $35 cap applies to

The cap applies to a “covered insulin product.” Under federal law, that means an insulin product that is a covered Part D drug under your prescription drug plan or Medicare Advantage plan with drug coverage, and that is approved or licensed and marketed as insulin.[4] CMS’s definition also includes a product that combines more than one type of insulin, or that combines insulin with a non-insulin drug. It does not include a compounded drug product that contains insulin.[8]

Two practical points follow from that definition.

First, the insulin has to be covered by the plan. Plans use a formulary (a list of covered drugs). If your insulin is on that list, or if the plan later covers it after a coverage determination or appeal, it is a covered insulin product and the monthly cap applies.[8] If your insulin is not covered, there is no $35 price to cap. The next step is usually a conversation with your prescriber about a covered alternative, or a request that the plan cover the insulin you already use. The Medicare insulin copay cap follows coverage. It does not create coverage for a product the plan does not cover.

Second, the cap is about the insulin product itself. Medicare is clear that some related items sit outside the $35 limit. If your Part D plan covers a disposable insulin patch pump, the pump is treated as a supply, not as the insulin. The insulin for that pump is still capped. The pump itself might cost more than $35.[2]

Part D, Medicare Advantage, and Part B: where insulin is billed

Medicare covers insulin in more than one place. Which “part” pays depends on how you take it.

Medicare Part D (a standalone drug plan, or the drug benefit inside many Medicare Advantage plans) may cover injectable insulin you take with a pen or a needle, insulin that is inhaled, and insulin used with pumps that are not covered as durable medical equipment under Part B. Those non-DME pumps include disposable pumps changed after two or three days (often called patch pumps) and certain reusable pumps that use disposable insulin cartridges.[1][2] Part D may also cover certain supplies used to inject insulin, such as syringes, needles, gauze, and alcohol swabs. Those supplies are not the $35 insulin cap.[1]

Medicare Part B covers insulin if you use an insulin pump covered under Part B’s durable medical equipment benefit. Part B does not cover insulin that you self-administer with pens, disposable patch pumps, or the insulin used with those disposable pumps. It also does not cover insulin-related supplies such as syringes, needles, alcohol swabs, or gauze.[1] For insulin used in a covered durable pump, Medicare caps the Part B coinsurance at $35 for a one-month supply and $105 for a three-month supply, and it does not apply the Part B deductible to that insulin.[5] Standard Medicare cost-sharing still applies to the pump itself, the tubing, and other pump supplies.[5]

That split is why a doctor’s order sometimes needs extra wording. CMS tells suppliers that an order for pump insulin should say whether the insulin is for a durable pump (billed to Part B) or for a disposable pump (billed to the drug plan). The goal is to send the claim to the right payer so you are not stuck with a denial while the pharmacy and supplier sort it out.[10]

Medicare Advantage plans (Part C) cover insulin, and the same monthly patient-cost protection applies when the plan is covering your insulin.[2] If you are comparing Original Medicare plus a Part D plan with a Medicare Advantage plan that includes drug coverage, insulin is one item to check on both sides, along with the plan’s formulary and pharmacy network. Our Medicare Advantage (MAPD) page explains how those plans package medical and drug coverage. The insulin cap itself is a federal rule, not a North Carolina add-on.

If you have Original Medicare Part B and a Medigap policy that pays your Part B coinsurance, Medicare says that policy should cover the $35 (or less) cost for your Part B-covered insulin.[1][2] That Medigap help applies to the Part B pump insulin, not to Part D pharmacy insulin.

What you can still pay extra for

The cap is narrower than many families first assume. You can still owe more than $35 in a month if you fill more than one covered insulin product. You can still owe plan cost-sharing for syringes, needles, alcohol swabs, and gauze. Under Part B, you pay those supply costs in full unless you have Part D coverage for them.[1] You can still owe standard cost-sharing for a durable insulin pump and its tubing.[5] You can still owe more than $35 for a patch pump if your drug plan covers the device, because the device is not the insulin product.[2]

You can also owe the plan’s normal cost-sharing for other diabetes medicines that are not insulin. GLP-1 medicines used for weight loss are the example families ask about most often. They are not insulin, and they are not under the $35 insulin cap. Medicare describes a separate GLP-1 pathway, including a $50 monthly copay under the Medicare GLP-1 Bridge for certain eligible people, which is a different rule from the insulin cap.[11] We covered that program in our GLP-1 Bridge guide. A weight-loss GLP-1 prescription does not ride along under the insulin copay cap.

Compounded products that contain insulin are also outside the covered-insulin definition CMS uses for the cap.[8] If a pharmacy is mixing a custom compound, do not assume the $35 limit applies. The cap also does not erase premiums. You still pay your Part D or Medicare Advantage premium, and you still have other medical cost-sharing. The insulin rule is a monthly limit on what you pay for covered insulin at the counter (or through the DME supplier for pump insulin). It is not a waiver of the rest of Medicare.

How this cap differs from other Medicare drug rules

Several 2025 and 2026 drug-cost rules get talked about in the same breath. They do different jobs.

The Medicare insulin copay cap is a monthly, per-product limit on covered insulin. It applies from the first fill of the year because the deductible does not apply to that insulin.[1][9]

The yearly Part D out-of-pocket cap is a different rule. It is an annual ceiling on what you pay for covered Part D drugs in total, after which your cost-sharing for those covered drugs drops to $0 for the rest of the year. Insulin copays you do pay still count toward that yearly total, but the two caps are not the same number and they do not start at the same time. We explained the annual cap in our Part D out-of-pocket cap guide.

The Medicare Prescription Payment Plan is also a different rule. It is an option to spread your out-of-pocket Part D costs across the calendar year, not a reduction in the insulin copay itself. See our 2026 Prescription Payment Plan article if you want that mechanism. Extra Help is a separate income-and-resource program that can lower Part D costs further, including insulin below $35 for people who qualify.[2] That program has its own rules, which we covered in our Extra Help guide. If a fill rings up above $35 for a covered insulin, the first question is whether the claim processed as a covered insulin product under Part D or Part B. If it did not, the cap never attached.

A practical check for North Carolina families

For households in Greensboro and the rest of the Piedmont, the federal cap is the same as it is in any other state. What still varies is the plan. During Open Enrollment, and any time a doctor changes an insulin, line up three facts: which insulin you actually take (brand, biosimilar, vial, or pen), whether each one is on the plan’s formulary, and whether you take it with a durable pump, a patch pump, or a pen or syringe.

If you use a durable pump, ask whether the insulin is billed to Part B as DME. If you use a patch pump or inject, ask whether the drug plan is the payer. If you fill a 90-day supply by mail, the cap is still $35 (or less) per month’s supply of each covered product, not $35 for the whole bottle.[1][9] CMS’s Part D rule also requires plans to apply the insulin cost-sharing protection to covered insulin obtained from an in-network or out-of-network pharmacy or provider, though other out-of-network rules can still affect how a claim is processed.[9]

If a charge looks wrong, bring the pharmacy receipt. You can also call 1-800-MEDICARE, and North Carolina’s State Health Insurance Assistance Program (SHIP) offers free counseling through the national SHIP locator Medicare lists on its insulin materials.[2] Our team can sit with you and read the plan’s insulin list next to what you already take. We do not replace your doctor. We can help you see whether the insulin you rely on is covered, and whether a pump-versus-pen billing issue is why a fill did not cap.

Practical takeaways

• In 2026, a one-month supply of each covered insulin product under Part D or Part B costs no more than $35, and the deductible does not apply to that insulin.[1]
• The cap is per covered insulin product. Two covered insulins can mean two copays, each no more than $35 for a month’s supply.[1]
• A three-month supply of one covered insulin is generally no more than $105. A two-month supply is generally no more than $70.[1][12]
• For 2026 Part D, the monthly amount is the lesser of $35, 25 percent of a negotiated maximum fair price if one applies, or 25 percent of the plan’s negotiated price, so some people may pay less than $35.[3][4]
• Injectable, inhaled, and disposable-pump insulin usually go through Part D. Insulin for a traditional durable pump usually goes through Part B. Medicare Advantage plans that cover insulin use the same patient-cost protection.[1][2]
• Syringes, needles, alcohol swabs, gauze, durable pumps, tubing, and patch-pump devices are not the insulin product. They can cost more than $35.[1][2][5]
• GLP-1 weight-loss drugs are not insulin and are not under this cap.[11]
• If a covered insulin fill is billed above $35, ask the pharmacy whether the claim processed as a covered insulin product, and whether it went to Part D or Part B.

How we can help

Have more questions or want to get in touch? Seniors Insurance Hub is an independent Medicare and senior insurance advisory serving Greensboro and the Piedmont. We can review your current insulin list next to your Part D or Medicare Advantage drug coverage, explain how the Medicare insulin copay cap fits with the rest of your plan, and help you prepare questions for your doctor or pharmacist. Call us at (336) 937-7501 or visit https://thesih.com/contact/.

Citations

1. Medicare.gov, "Insulin" (2026)
2. Medicare.gov, "3 Things to Know About Medicare Insulin Costs" (2026-04)
3. Centers for Medicare & Medicaid Services, "Contract Year 2026 Policy and Technical Changes to the Medicare Advantage Program, Medicare Prescription Drug Benefit Program, Medicare Cost Plan Program, and Programs of All-Inclusive Care for the Elderly (CMS-4208-F)" (2025-04-04)
4. Legal Information Institute, Cornell Law School, "42 U.S. Code § 1395w-102 - Prescription drug benefits" (current)
5. Centers for Medicare & Medicaid Services, "Billing Medicare Part B for Insulin with New Limits on Patient Monthly Coinsurance (MLN4443820)" (2026-02)
6. HHS Office of the Assistant Secretary for Planning and Evaluation, "The Changing Insulin Affordability Landscape: Lower Out-of-Pocket Costs and Expanded Access Pathways" (2026-07-20)
7. Centers for Medicare & Medicaid Services, "Part D Senior Savings Model" (page stating IRA $35 cap beginning 2023-01-01)
8. Legal Information Institute, Cornell Law School, "42 CFR § 423.100 - Definitions" (current, including 2026 amendments)
9. Legal Information Institute, Cornell Law School, "42 CFR § 423.120 - Access to covered Part D drugs" (current)
10. Centers for Medicare & Medicaid Services, "Medicare Coverage of Diabetes Supplies (MLN7674574)" (2026)
11. Medicare.gov, "Weight loss drugs" (2026)
12. Medicare.gov, "Medicare Coverage of Diabetes Supplies, Services, & Prevention Programs" (2026)