Part D redesign changes have reshaped how millions of Medicare beneficiaries pay for prescription drugs. The Inflation Reduction Act of 2022 triggered the biggest overhaul of Medicare drug coverage since Part D launched in 2006. Starting in 2025, the law eliminated the infamous “donut hole” and capped annual out-of-pocket drug spending for the first time.
For 2026, that cap sits at $2,100. Before the Part D redesign, beneficiaries with serious conditions like cancer or multiple sclerosis could spend $10,000 or more per year on medications. Understanding these changes matters. They affect what you pay at the pharmacy, which plan you should pick, and how you budget for the year.
What the Part D Redesign Eliminated and What Replaced It
For nearly two decades, Part D had four confusing coverage phases. Beneficiaries moved through a deductible, an initial coverage period, the coverage gap known as the donut hole, and finally catastrophic coverage. The donut hole was the most painful stretch. Enrollees paid a larger share of drug costs there until they spent enough to escape it. Even worse, catastrophic coverage still required 5% coinsurance with no ceiling. As a result, high-cost patients faced unlimited exposure.
The Part D redesign replaced that maze with three simple phases. First comes the annual deductible, which cannot exceed $615 in 2026, according to CMS program instructions. Next is the initial coverage phase, where you pay 25% coinsurance or a set copay. Finally, catastrophic coverage begins once your out-of-pocket spending hits the annual cap. At that point, you pay $0 for covered drugs for the rest of the year. The 5% endless coinsurance is gone.
The cap started at $2,000 in 2025. It adjusts each year based on drug spending growth, which is why it rose to $2,100 for 2026. The cap counts your deductible, copays, and coinsurance. However, it does not count your monthly plan premiums. Payments made on your behalf by the Extra Help program or most manufacturer assistance also count toward the cap. That quirk helps many people reach $0 cost sharing faster than they expect.
How the Part D Redesign Shifted Costs Behind the Scenes
The savings for beneficiaries did not appear out of thin air. The Part D redesign shifted financial responsibility onto insurance plans and drug manufacturers. In the old system, Medicare paid 80% of costs in the catastrophic phase. Under the new structure, plans like UnitedHealthcare, Humana, Aetna, Cigna, and Blue Cross affiliates shoulder 60% of catastrophic costs for most drugs. Manufacturers now pay a 20% discount in that phase as well. This gives insurers a stronger reason to manage drug spending carefully.
Here is how the three phases break down for a typical enrollee in 2026:
| Phase | You Pay | When It Applies |
|---|---|---|
| Deductible | 100% of drug costs | Until you meet your plan’s deductible (up to $615) |
| Initial Coverage | 25% coinsurance or plan copays | Until your out-of-pocket total reaches $2,100 |
| Catastrophic | $0 for covered drugs | Rest of the calendar year |
These shifts had side effects. Because plans absorb more risk, many tightened their formularies and expanded prior authorization. Some stand-alone drug plans left certain markets entirely. Premiums also came under pressure, though a federal stabilization demonstration limited year-over-year increases. In most cases, beneficiaries still came out far ahead. KFF estimated that millions of enrollees benefit from the cap, especially those taking expensive brand-name drugs for cancer, rheumatoid arthritis, or blood clots.
The redesign also arrived alongside other Inflation Reduction Act changes. Insulin copays are capped at $35 per month’s supply. Recommended vaccines, such as the shingles shot, cost $0 under Part D. In 2026, the first 10 negotiated drug prices took effect for medications including Eliquis, Jardiance, Xarelto, and Entresto. CMS projects those negotiated prices will save Part D enrollees roughly $1.5 billion in out-of-pocket costs in 2026 alone.
What Beneficiaries Should Do Now to Capture the Savings
Start by rereading your plan’s Annual Notice of Change. Every September, your insurer mails this document. It lists next year’s deductible, copay tiers, and formulary changes. Because the Part D redesign pushed plans to restructure benefits, these notices matter more than ever. A drug that cost you a flat copay last year may move to a coinsurance tier this year. Check every medication you take, not just the expensive ones.
Next, compare plans during Open Enrollment, which runs October 15 through December 7. The Medicare Plan Finder at Medicare.gov shows your estimated annual drug costs under each plan. Enter your exact drug list and preferred pharmacies. For example, two plans with similar premiums can produce very different totals once deductibles and tiers are factored in. If you want free one-on-one help, contact your State Health Insurance Assistance Program. SHIP counselors are trained, unbiased, and available in every state.
❤️ Get Free Medicare Guides
Free · No spam · Unsubscribe anytime
Also consider the Medicare Prescription Payment Plan. This program, sometimes called “smoothing,” lets you spread out-of-pocket costs into monthly installments across the year. It does not lower your total costs. However, it prevents a single $2,100 bill at the pharmacy counter in January. Anyone with Part D can opt in through their plan, and starting in 2026 enrollment renews automatically. Finally, check whether you qualify for Extra Help. This federal subsidy now covers everyone up to 150% of the federal poverty level, and it dramatically reduces deductibles and copays.
Frequently Asked Questions
Is the Medicare donut hole really gone?
Yes, the coverage gap ended permanently on January 1, 2025. The Part D redesign replaced it with a simple three-phase benefit. Once you hit the annual cap, your covered drugs cost $0 for the rest of the year.
Does the $2,100 cap include my premiums?
No, monthly premiums do not count toward the cap. Only your deductible, copays, and coinsurance for covered drugs count. Typically, drugs not on your plan’s formulary do not count either, so formulary exceptions matter.
Do Medicare Advantage members get the same protections?
Yes, the redesign applies to all plans with Part D drug coverage. That includes Medicare Advantage prescription drug plans from carriers like Humana and UnitedHealthcare. The same cap, phases, and payment plan option apply across the board.
Compare Medicare Options
Ready to explore your Medicare coverage choices? Comparing plans from multiple carriers is the most effective way to find the right coverage at the best rate for your situation.
(paid link)
Official Sources & Resources
For verified information on Medicare regulations and consumer protection:
- Medicare.gov (Official Site): medicare.gov
- CMS (Centers for Medicare & Medicaid Services): cms.gov
- NAIC (National Association of Insurance Commissioners): naic.org
- KFF Medicare Research: kff.org/medicare
- Social Security Administration: ssa.gov
Content last reviewed July 2026. If you notice any outdated information, please contact us.