Creditable coverage is prescription drug coverage expected to pay, on average, at least as much as Medicare's standard Part D plan. Having it lets you delay signing up for Part D without ever owing a late penalty, which matters because that penalty is permanent: once it attaches, it's added to your premium for as long as you have Medicare drug coverage. This guide explains what makes coverage creditable, the 63-day rule that triggers the penalty, what counts and what doesn't, how to estimate the surcharge, and why you should hold on to the notices your plan sends every year.
What creditable coverage means
When you become eligible for Medicare, you don't have to enroll in a Part D drug plan right away, as long as you have other drug coverage that's at least as good. That's the idea behind creditable coverage. Coverage is creditable when it's expected to pay, on average, at least as much as Medicare's standard Part D benefit.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage If your coverage clears that bar, you can put off Part D for as long as you keep it, and you won't face a penalty when you eventually enroll.
The flip side is just as important. If your drug coverage isn't creditable, or if you have no drug coverage at all, the clock toward a penalty starts running once your Part D enrollment window closes. So the first thing to find out is whether the coverage you already have counts.
The 63-day rule
Here's the rule that decides whether you owe a penalty. The Part D late enrollment penalty applies if you go 63 or more continuous days after the end of your Part D Initial Enrollment Period without either Part D coverage or other creditable drug coverage.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage Stay continuously covered, by creditable coverage or by a Part D plan, and no penalty applies. Let a gap of 63 days or longer open up, and the penalty attaches when you finally enroll.
What counts as creditable coverage
Several common kinds of drug coverage can be creditable. CMS's list of examples is deliberately open-ended (creditable coverage "includes, but is not limited to" the categories below), and whether a given plan qualifies is something that plan determines and tells you.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage
Read the employer and union rows below carefully, because this is where readers most often over-read the list. CMS says only that some employer-based drug coverage is creditable, and that coverage from a current or former employer or union "may be considered creditable."Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage That is a "can be," not a "usually is," and it is precisely why the annual determination and the notice exist. Treat every row in this table as "this kind of coverage can qualify," then get your own plan's answer in writing.
| Coverage type | Can it be creditable? |
|---|---|
| Employer or union group health plan (while you or a spouse work) | Some plans, not all. Check this year's notice |
| Retiree coverage from a former employer or union | Some plans, not all. Check this year's notice |
| Federal Employees Health Benefits (FEHB) Program | Some plans, not all. Check this year's notice |
| TRICARE for military retirees and families | Yes |
| VA drug benefits | Yes |
| Qualified State Pharmaceutical Assistance Program (SPAP) | Yes |
| Indian Health Service, Tribal, or Urban Indian program coverage | Yes |
| Medicare supplement (Medigap) policy | Certain policies |
Some things that feel like drug coverage are explicitly not creditable: prescription drug discount cards, free clinics, and drug-discount websites.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage Medicare.gov puts free samples from your doctor on that list too, and its reasoning covers the whole group: none of these is prescription drug coverage in the first place.Centers for Medicare & Medicaid Services. (2026). Final CY 2026 Part D Redesign Program Instructions. cms.gov. Retrieved Jul 10, 2026, from https://www.cms.gov/newsroom/fact-sheets/final-cy-2026-part-d-redesign-program-instructions However much they save you at the pharmacy, none of them stops the penalty clock.
Don't assume in either direction. The same type of plan can be creditable for one person and not for another, depending on how that specific plan is designed. That's why every entity offering drug coverage has to make the determination each year and tell you the answer. And there are two different tests a group health plan can use to reach that answer, which matters if yours comes back close to the line; see the 2026 note on testing further down this page.Centers for Medicare & Medicaid Services. (2026). Final CY 2026 Part D Redesign Program Instructions. cms.gov. Retrieved Jul 10, 2026, from https://www.cms.gov/newsroom/fact-sheets/final-cy-2026-part-d-redesign-program-instructions
COBRA continuation coverage is the case that trips people up most, because CMS doesn't name it among its examples of creditable coverage. That list isn't a closed one, though, and COBRA continues an employer's group health plan, a plan that still owes you an annual determination and disclosure of whether its drug coverage is creditable. CMS's own list of who must receive the annual notice names "Medicare eligible COBRA individuals and their dependents," which settles that COBRA drug coverage sits inside the disclosure regime and has to be told which side of the line it falls on.Centers for Medicare & Medicaid Services. (n.d.). Creditable Coverage — CMS (employers and plan sponsors). cms.gov. Retrieved Jul 30, 2026, from https://www.cms.gov/medicare/prescription-drug-coverage/creditablecoverage It does not settle whether COBRA is creditable; that still turns on the actuarial standard, plan by plan. So treat COBRA as neither automatically creditable nor automatically not: ask the plan administrator for this year's determination in writing before your Part D window closes. (COBRA works differently again for Part B. See COBRA instead of Medicare Part B.)
The annual notice, and why you keep it
Every year, your plan sponsor has to decide whether the drug coverage it offers is creditable and disclose that status to you in writing. That's the notice most people know as the Notice of Creditable Coverage.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage It has to reach you before the Annual Coordinated Election Period, the fall window medicare.gov calls Medicare Open Enrollment, so in practice the notice arrives before October 15, in time for you to choose between keeping your current coverage and picking up a Part D plan.Centers for Medicare & Medicaid Services. (n.d.). Creditable Coverage — CMS (employers and plan sponsors). cms.gov. Retrieved Jul 30, 2026, from https://www.cms.gov/medicare/prescription-drug-coverage/creditablecoverage
If a notice tells you the coverage is not creditable, the regulation requires it to say three specific things: that the coverage is not creditable, that there are limits on when during the year you can enroll in a Part D plan, and that you may be subject to a late enrollment penalty.Centers for Medicare & Medicaid Services. (n.d.). Creditable Coverage — CMS (employers and plan sponsors). cms.gov. Retrieved Jul 30, 2026, from https://www.cms.gov/medicare/prescription-drug-coverage/creditablecoverage Those three items are worth knowing even if you never got the notice, because they are the yardstick for the section that follows.
If the notice never came
This is the case that ruins people: a retiree keeps a former employer's drug plan, is never told it isn't creditable, and years later is handed a lifetime surcharge. Federal regulation contemplates exactly that situation. Under 42 CFR 423.56(g), if you establish to CMS that you were not adequately informed that your prescription drug coverage was not creditable, you may apply to CMS to have that coverage treated as creditable for purposes of the late enrollment penalty.Centers for Medicare & Medicaid Services. (n.d.). Creditable Coverage — CMS (employers and plan sponsors). cms.gov. Retrieved Jul 30, 2026, from https://www.cms.gov/medicare/prescription-drug-coverage/creditablecoverage
Read that at its actual strength, because it is a real door and not a guarantee. The regulation gives you the right to apply, and it conditions that right on your establishing to CMS that you were not adequately informed. It does not say CMS must grant it, and it does not lay out a process. What it does mean is that "nobody ever told me" is a recognized argument rather than a dead end, and that comparing what you actually received against the three things a non-creditable notice was required to contain is how you make it. If you're in this position, call 1-800-MEDICARE or your SHIP counselor (both below) before you accept the penalty as final.
Keep the notices you receive, because they are what let you answer the one question that can cost you money later. When you join a Medicare drug plan, it may send you a letter asking whether you had creditable prescription drug coverage. Complete that form and return it by the deadline in the letter. If you don't, the plan has no way to know you were covered, and you will be charged the late enrollment penalty even though you had creditable coverage the whole time.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage
How the penalty is calculated
The penalty is 1% of the national base beneficiary premium for each full month you were eligible for Part D but went without Part D or creditable coverage.Centers for Medicare & Medicaid Services. (n.d.). Avoid late enrollment penalties. medicare.gov. Retrieved Jul 15, 2026, from https://www.medicare.gov/basics/costs/medicare-costs/avoid-penalties That amount is added to your monthly Part D premium, and it stays there for as long as you have Part D. Because the national base premium can change from year to year, the dollar amount of the penalty can shift over time, but the structure is fixed: more months without coverage means a higher permanent surcharge.
That permanence is the whole reason creditable coverage is worth understanding before you decide to delay Part D. A few months of an avoidable gap can mean a small surcharge you carry for the rest of your life. There are limited exceptions, and the one that matters most is Extra Help, Medicare's low-income drug subsidy: generally there is no Part D late enrollment penalty at all if you qualify for it.Centers for Medicare & Medicaid Services. (n.d.). Avoid late enrollment penalties. medicare.gov. Retrieved Jul 15, 2026, from https://www.medicare.gov/basics/costs/medicare-costs/avoid-penalties If money is the reason you went without drug coverage, check Extra Help before you assume you owe a surcharge for life.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage For most people, though, the surcharge really does last as long as the drug coverage does.
A 2026 note on how plans test for creditable status
Under the Inflation Reduction Act, Medicare's standard Part D benefit was redesigned for 2026.Centers for Medicare & Medicaid Services. (2026). Final CY 2026 Part D Redesign Program Instructions - CMS. cms.gov. Retrieved Aug 22, 2026, from https://www.cms.gov/files/document/final-cy-2026-part-d-redesign-program-instruction.pdf CMS also revised the simplified determination test that group health plans outside the retiree drug subsidy program may use to judge their own drug coverage: under the existing method the plan has to be designed to pay at least 60% of participants' prescription drug expenses, and under the revised method at least 72%. For CY 2026 only, CMS lets those plans use either one (Final CY 2026 Part D Redesign Program Instructions, CMS).Centers for Medicare & Medicaid Services. (2026). Final CY 2026 Part D Redesign Program Instructions. cms.gov. Retrieved Jul 10, 2026, from https://www.cms.gov/newsroom/fact-sheets/final-cy-2026-part-d-redesign-program-instructions The word CMS uses is "only", so treat the choice between the two simplified methods as a one-year accommodation rather than a standing option.
One thing not to read into that higher bar: the simplified test is only one of the two routes CMS allows these plans, and the other, actuarial equivalence testing, is unaffected by the change.Centers for Medicare & Medicaid Services. (2026). Final CY 2026 Part D Redesign Program Instructions. cms.gov. Retrieved Jul 10, 2026, from https://www.cms.gov/newsroom/fact-sheets/final-cy-2026-part-d-redesign-program-instructions So coverage that misses 72% under the simplified method has not automatically stopped being creditable. What it means for you is narrower and more practical: some employer or retiree coverage that was creditable in 2024 or 2025 may be re-tested for 2026, and the answer can come back different. If your coverage is anywhere near the threshold, don't infer the result. Ask the plan or your benefits administrator for its current creditable-coverage determination in writing, because that determination, not your own arithmetic, is what protects you from the penalty.
Where to get help
If your plan sponsor won't give you a clear answer on whether your drug coverage is creditable, two free sources can help you check before a gap opens up.
Frequently Asked Questions
How do I know if my drug coverage is creditable?
Your plan sponsor is required to determine the status every year and disclose it to you in writing, in the Notice of Creditable Coverage, which normally arrives before October 15. If you can't find it, contact the plan's benefits administrator and ask directly whether the drug coverage is creditable. If you still can't get a clear answer, call 1-800-MEDICARE (1-800-633-4227) or your State Health Insurance Assistance Program (SHIP) at shiphelp.org.
What if I was never told my coverage wasn't creditable?
You have a route, and it is written into the regulation. If you establish to CMS that you were not adequately informed that your drug coverage was not creditable, you may apply to CMS to have that coverage treated as creditable for purposes of the Part D late enrollment penalty, under 42 CFR 423.56(g).Centers for Medicare & Medicaid Services. (n.d.). Creditable Coverage — CMS (employers and plan sponsors). cms.gov. Retrieved Jul 30, 2026, from https://www.cms.gov/medicare/prescription-drug-coverage/creditablecoverage That is a right to apply on a showing you have to make, not an automatic waiver, and the regulation doesn't describe the process. Start by gathering whatever the plan did send you, then compare it against what a non-creditable notice was required to contain: that the coverage is not creditable, that there are limits on when in the year you can enroll in a Part D plan, and that you may be subject to a late enrollment penalty.Centers for Medicare & Medicaid Services. (n.d.). Creditable Coverage — CMS (employers and plan sponsors). cms.gov. Retrieved Jul 30, 2026, from https://www.cms.gov/medicare/prescription-drug-coverage/creditablecoverage Then call 1-800-MEDICARE (1-800-633-4227) or your State Health Insurance Assistance Program (SHIP) at shiphelp.org.
Does a short gap in coverage trigger the Part D penalty?
No. The penalty is triggered only by a gap of 63 or more continuous days without Part D or creditable coverage after your Initial Enrollment Period ends. A gap shorter than 63 days does not trigger it.
Is COBRA creditable coverage?
Not automatically, and CMS doesn't name COBRA among its examples of creditable coverage. That list isn't a closed one, though, and the sponsor of the underlying group health plan still has to determine and disclose each year whether its drug coverage is creditable. Ask the plan administrator for that determination in writing rather than assuming either way, and don't let a 63-day gap open up while you wait for the answer.
How long does the Part D penalty last?
For as long as you have Part D coverage. The penalty is added to your monthly premium and stays there, which is why avoiding the 63-day gap in the first place matters so much. There are limited exceptions.Centers for Medicare & Medicaid Services. (n.d.). Creditable prescription drug coverage. medicare.gov. Retrieved Aug 22, 2026, from https://www.medicare.gov/health-drug-plans/part-d/basics/creditable-coverage The important one is Extra Help: generally there is no Part D late enrollment penalty if you qualify for Medicare's low-income drug subsidy.Centers for Medicare & Medicaid Services. (n.d.). Avoid late enrollment penalties. medicare.gov. Retrieved Jul 15, 2026, from https://www.medicare.gov/basics/costs/medicare-costs/avoid-penalties
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The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.