If you take insulin and have Medicare, here is news worth knowing: a covered one-month supply of insulin now costs you no more than $35. This protection comes from the Inflation Reduction Act, it works automatically, and it has been in place since 2023.
What the $35 insulin cap is
The Inflation Reduction Act created a cap so that a covered one-month supply of insulin costs no more than $35 for people with Medicare. That is the short version, and it really is that straightforward.
A few details make it easier to understand:
- The cap applies per covered insulin product, per month. If you use more than one type of covered insulin, each one is capped separately.
- It began in 2023 and continues in 2026, so this is a stable, ongoing protection, not a one-time deal.
- It works automatically. You do not apply, sign up, or fill out any forms to get it.
In other words, when you fill a covered insulin at the pharmacy, your plan applies the cap for you. There is nothing extra you need to do.
What you actually pay
You pay no more than $35 for a covered month’s supply of insulin. Just as important, no Part D deductible applies to insulin. That means you do not have to meet a deductible first before the cap kicks in. Even in January, when many other drug costs may still be working through your deductible, your covered insulin is capped at $35 right out of the gate.
If you get a longer supply, such as a three-month fill, the cap is applied for each month’s supply, so the math scales accordingly. The key idea is simple: a covered month’s supply should never cost you more than $35.
This is a big change from the way things used to be. In the past, insulin costs could swing a great deal depending on the time of year and where you were in your plan’s phases. The $35 cap replaces that uncertainty with a clear, predictable number.
Part D insulin vs. Part B insulin
Most insulin is self-administered, so it falls under Part D (either a standalone Part D plan or a Medicare Advantage plan that includes drug coverage). The $35 cap applies to these Part D-covered insulins.
But the cap also reaches further. It applies to insulin used with a Part B durable insulin pump, too. So whether you take insulin by pen or vial through your drug plan, or you use insulin through a covered pump, the $35-per-month protection follows you. If you would like a broader look at how Medicare handles this medication, our guide on whether Medicare covers insulin walks through the details.
How to make sure you get it
Because the cap is automatic, most people simply see the lower price at the pharmacy without doing anything. Still, there is one thing worth confirming.
Different plans cover different insulins on their formularies, which are the lists of drugs each plan covers. The $35 cap applies to covered insulins, so it is still worth confirming that your specific insulin is on your plan’s list. If a particular insulin is not on your plan’s formulary, the cap may not apply to that exact product the way you expect.
Here are two easy ways to check:
- Look up your insulin with our Formulary Lookup to confirm it is covered by your plan.
- Run your medications through our Drug Cost Calculator to see your expected costs for the year, insulin included.
If your insulin is not on your plan’s list, that does not necessarily mean you are stuck. You and your prescriber can ask your plan for a coverage exception, and during the Annual Enrollment Period you may be able to switch to a plan that covers your insulin. Never change how you take your insulin on your own, though. Any dosing or medication decisions should always go through your doctor.
Who this helps
The $35 cap helps anyone with Medicare who relies on insulin, and it makes the biggest difference for people who use multiple insulins or who used to face high costs early in the year. Because there is no deductible to meet first and the price is capped each month, you can budget with confidence and avoid those unwelcome surprises at the counter.
It is also worth knowing that insulin costs still count toward your overall Part D out-of-pocket total. Once your covered drug spending reaches the annual limit, you pay $0 for covered drugs the rest of the year. You can read more about that protection in our guide to the $2,000 drug cap.
A quick word of reassurance
The insulin cap is one of the clearest, friendliest changes Medicare has made in recent years. A covered month’s supply of insulin costs no more than $35, there is no deductible to clear first, and it happens automatically.
If you would like help making sure your insulin is covered or comparing plans that fit your medications, I am glad to walk through it with you, no pressure at all. Just reach out through our contact page and we will take it one step at a time.
Medical & coverage disclaimer: This article is general education — not medical advice or a guarantee of coverage. Whether a specific drug is covered, and what you’ll pay, depends on your individual Part D or Medicare Advantage plan, its formulary, and the plan year, and can change. Always confirm with your plan or a licensed agent, and talk to your doctor about your treatment.