Medicare’s prescription drug benefit went through its biggest structural overhaul in two decades, thanks to the Inflation Reduction Act. The donut hole is gone, out-of-pocket costs are capped for the first time, ten common drugs now cost less, and insulin is capped at $35 a month. What hasn’t changed: the plan that works best for you still depends entirely on which specific drugs you take and which pharmacies you use — and that decision requires the Medicare Plan Finder, not a TV commercial.
Key Answers Before You Choose a Plan
The questions below are ones we find seniors get wrong the most often — usually because the commercials focus on premiums and skip the costs that actually drive the bill.
Yes — and this is the most important change in Medicare’s history. Starting in 2025, Part D has a hard $2,000 annual out-of-pocket cap, which increased to $2,100 for this coverage year. Once you hit that amount in covered drug costs, you pay zero for the rest of the year. Before the Inflation Reduction Act, there was no cap, and seniors taking expensive specialty drugs could pay unlimited amounts.
The donut hole — the coverage gap where you briefly paid full drug costs — was eliminated as of 2025 and does not exist in this coverage year. What replaced it is a cleaner two-phase system: you pay 25% of drug costs after the deductible until you hit the $2,100 out-of-pocket cap, then $0 after that. Plans, drug manufacturers, and Medicare split the rest.
You have to use the Medicare Plan Finder at medicare.gov/plan-compare. Enter every drug you take, its dosage, and the pharmacies you use — and the tool will calculate your estimated total annual cost for each plan in your area, not just the premium. The mistake worth avoiding is comparing only the monthly premium. Premiums and copays trade off against each other, so a plan with a very low premium can cost more overall if it puts your medications on higher tiers. The Plan Finder shows the combined estimate.
Possibly, yes. For the first time, Medicare has negotiated prices with drug manufacturers on ten high-cost medications, with those prices taking effect this coverage year. The average reduction is at least 38% off the 2023 list price. If you take Eliquis, Enbrel, Entresto, Farxiga, Imbruvica, Januvia, Jardiance, Fiasp/NovoLog, Stelara, or Xarelto, your out-of-pocket cost on some plans dropped significantly. However, the savings you see depend on how your plan structures its copay tiers and whether you’ve met your deductible.
Yes. The Medicare Prescription Payment Plan (M3P), introduced in 2025, lets you elect to smooth out your out-of-pocket drug costs into roughly equal monthly installments across the year rather than paying large amounts at the pharmacy when you fill expensive prescriptions. This is optional — you opt in each year. If you switched to a new plan, you’ll need to re-enroll. It doesn’t reduce what you owe, only when you pay it.
Apply for Extra Help, also called the Low-Income Subsidy (LIS). It is a federal program run by Social Security that covers all or most Part D premiums, deductibles, and copays for people with limited income and resources. It is worth roughly $6,200 a year in drug cost savings. More than 2 million seniors who qualify never apply. The income limit is approximately $23,940 for individuals and $32,460 for married couples. Resources also have limits. You can apply at any time — there is no enrollment window.
You will owe a permanent late enrollment penalty added to your monthly premium for as long as you have Part D. The penalty is 1% of the national base premium ($38.99) for every full month you went without creditable drug coverage. Twelve missed months adds roughly $4.70/month forever. Twenty-four months adds about $9.40/month. The penalty compounds the longer you wait, and it does not reset if you switch plans.
How Part D Coverage Works — The Three Phases
The coverage structure changed substantially when the donut hole was eliminated. Here is what each phase means in plain terms, and roughly what it costs you.
If you expect to hit the OOP cap, you can elect the Medicare Prescription Payment Plan (M3P) to spread your costs into roughly equal monthly installments across the year. This is useful for people who take an expensive specialty medication at the start of the year and face a large cost in January. It does not reduce what you owe — only when you pay. You must re-enroll if you switched plans.
The Ten Drugs with Negotiated Prices — Who Benefits
For the first time in Medicare’s history, CMS negotiated directly with drug manufacturers on ten high-cost Part D drugs. The negotiated prices took effect this January. According to AARP, average out-of-pocket costs for these drugs fell roughly 50% for original Medicare enrollees in certain standalone plans. All Part D plans are required to include these drugs on their formularies at the negotiated price.
Your copay at the pharmacy will depend on which plan tier your drug is placed on and whether you’ve met your deductible — but all plans must cover these drugs at the negotiated price. In practice, many Part D enrollees who take Eliquis or Xarelto, two of the most common drugs among Medicare beneficiaries, are seeing meaningful reductions. The next round of negotiated prices — for 15 more drugs including Ozempic — is expected to take effect in 2027.
If you take any of these ten drugs, go to medicare.gov/plan-compare and enter your drug name, dosage, and pharmacy to see your actual estimated cost by plan. The difference between plans on a single specialty drug can be hundreds of dollars a month.
Late Enrollment Penalty — What It Will Cost You Forever
Missing your Part D enrollment window is one of the most expensive Medicare mistakes a senior can make. The penalty is permanent — it follows you even when you switch plans — and it grows the longer you wait. This calculator shows the real monthly and yearly cost.
You do not owe a late enrollment penalty if you had creditable drug coverage from another source — an employer plan, union plan, TRICARE, VA benefits, or certain other programs — without a gap of 63 days or more. If you retired and lost employer coverage, you have 63 days to enroll in Part D without penalty. After 63 days, the penalty clock starts. Qualifying for Extra Help also waives the penalty.
Standalone Part D vs. Medicare Advantage Drug Coverage — Which Is Better
You have two ways to get prescription coverage: a standalone Part D plan (PDP) added to original Medicare, or a Medicare Advantage plan with built-in drug coverage (MA-PD). Neither is universally better. It depends on what other health coverage you have and what your drugs cost on each option.
| Factor | Standalone Part D (PDP) | Medicare Advantage with Drug Coverage (MA-PD) |
|---|---|---|
| Who it works with | Original Medicare (Parts A and B) | Replaces original Medicare |
| Average monthly premium | Avg. ~$34.50 (standalone) | Avg. ~$11.50 for drug portion; avg. $14 total MA premium |
| Doctor and hospital choice | Any doctor who accepts Medicare | Typically restricted to plan network |
| Out-of-pocket drug cap | $2,100 per year | $2,100 per year |
| Formulary flexibility | Plan-specific; compare on Plan Finder | Plan-specific; compare on Plan Finder |
| Medigap compatibility | Yes — you can have a Medigap supplement | No — Medigap does not work with MA plans |
| Best for | Seniors with Medigap, those who want unrestricted provider choice | Seniors who want one plan covering everything at lower premiums |
Every year during open enrollment (October 15 – December 7), your current plan may have changed its formulary, tier structure, or copays. A drug that cost you $45 last year may now cost $90 on the same plan — or $12 on a different one. Premiums, deductibles, and copays vary widely between plans, and the Plan Finder is the only place that adds them up for your own drug list. The tool is free and typically takes a few minutes once you have your medication list handy.
Extra Help — The $6,200 Benefit Most Eligible Seniors Miss
Over 2 million seniors who qualify for Extra Help (the Low-Income Subsidy) are not enrolled. Many assume they don't qualify because they own a home or a car. They're wrong — those assets don't count. Here is the actual eligibility test.
You likely qualify for Extra Help if your income is below approximately $23,940 per year for an individual (roughly $2,015/month) or $32,460 for a married couple. The resource limit is approximately $18,090 for an individual or $36,100 for a couple — but here's what doesn't count toward resources: your home, your car, personal possessions, burial plots, and certain burial funds. Since 2024, if you qualify, you get the full subsidy. There is no longer a partial subsidy tier.
If you receive Medicaid, a Medicare Savings Program benefit, or Supplemental Security Income (SSI), you are automatically enrolled in Extra Help. Everyone else must apply.
If approved, Extra Help can cover your Part D monthly premium up to the plan benchmark, your annual deductible, and your drug copays — reducing them to as low as $5.10 for generics and $12.65 for brand-name drugs. For insulin, the copay can fall to $1.55–$4.50 per prescription. The program is estimated to be worth about $6,200 a year for a typical enrollee. You can apply at any time during the year — there is no enrollment window or deadline.
Your Situation — Which Answer Applies to You
Yes — these are among the ten Medicare-negotiated drugs effective this coverage year, and CMS confirmed the minimum discount is 38% off the 2023 list price. AARP's analysis found that average out-of-pocket costs for these ten drugs dropped roughly 50% compared to 2025 for enrollees in certain standalone Part D plans. The key phrase is "certain plans" — your savings depend on how your specific plan tiers the drug and your stage in the benefit year. Run your drugs through the Plan Finder to see your estimated cost on each plan available in your area. If your plan changed how it covers your drug after this year's formulary update, a plan switch may save you significantly more.
Insulin copays for any covered insulin product are capped at $35 per month per insulin, regardless of which benefit phase you're in. This applies even before you meet your deductible. It applies to every Part D plan and every MA-PD plan that covers the insulin. If you use multiple insulin products, the cap applies to each one separately. You should not be paying more than $35 per covered insulin per month at the pharmacy — if you are, ask your pharmacist to verify the billing or call your plan.
Probably, yes — at least check. Plans change their formularies, copay tiers, deductibles, and premium every single year. A plan that was the best deal for your drug list last year may have moved one of your medications to a higher tier or dropped a preferred pharmacy from its network. Staying on autopilot is the risky choice, because a plan you keep can change what it charges for your drugs without you changing anything. The check is quick on the Plan Finder.
You have a seven-month window starting three months before your 65th birthday to enroll in Medicare and Part D without a penalty. If you have creditable prescription drug coverage from a current employer plan, you can wait — but get it in writing and keep the documentation. If you retire and lose that coverage, you have 63 days to enroll in Part D without penalty. Missing that window starts the permanent penalty clock. When you enroll, use the Plan Finder with your current drug list to pick the plan — the plan with the lowest premium is not always the cheapest once copays are calculated.
Medigap covers Medicare Part A and B cost-sharing but does not cover Part D drug costs. You still need a standalone Part D plan. Your Medigap coverage does not affect which Part D plan you choose — but the combination means you'll generally want a standalone PDP rather than Medicare Advantage, since Medigap does not work alongside MA plans. The Plan Finder will show you standalone PDPs when you select that you have original Medicare.
Yes. Your home is excluded from the resource calculation for Extra Help. Your car is excluded too. The resources that count are things like checking and savings account balances, stocks, bonds, and retirement account funds — not real property or personal possessions. If your countable resources are under about $18,090 (individual) or $36,100 (couple) and your income falls below the Extra Help limits, apply through Social Security. The process takes about 15 minutes online or by phone, and the benefit is worth roughly $6,200 a year. Many seniors who qualify skip applying because they assume a house disqualifies them — it doesn't.
All Medicare Part D figures — the $2,100 out-of-pocket cap, $615 maximum deductible, $38.99 national base premium, $35/month insulin cap, and the list of ten Medicare-negotiated drugs — are sourced from CMS fact sheets and the Idaho DOI and Illinois Department on Aging's Medicare updates for this coverage year. Extra Help income limits ($23,940 individual / $32,460 married couple) and resource limits ($18,090 individual / $36,100 married couple) are drawn from SSA guidance and state SHIP program materials verified as of early this year; SSA applies exclusions before counting income and resources. The average 50% out-of-pocket reduction for negotiated drugs is from AARP's analysis of standalone Part D plans. The $6,200 Extra Help value estimate is from Humana's published figure. Late enrollment penalty calculation uses the base premium of $38.99 per CMS. Open enrollment dates (October 15 – December 7 annually) are from CMS. Average plan premiums ($34.50 standalone PDP, $14 MA plan, $11.50 MA-PD drug portion) are CMS projections. Medicare Advantage OOP limit for in-network services ($9,250) is from CMS. This page provides general educational information and is not medical, legal, or financial advice. Always verify plan-specific details and your drug's coverage on the Medicare Plan Finder at medicare.gov/plan-compare or by calling 1-800-MEDICARE before enrolling.
Key sources: CMS.gov · Medicare.gov · SSA.gov · KFF.org · AARP · BudgetSeniors.com