There's no one-size-fits-all Part D plan. Here's how prescription drug coverage actually works, what it costs in 2026, and how to choose the right plan for your medications.
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Medicare Part D, commonly called a Prescription Drug Plan or PDP, is coverage that helps pay for your prescription medications. It’s sold by private insurance companies approved by Medicare — and there is no one-size-fits-all plan. The plan your neighbor or friend bought may not be the best plan for you.
Who is eligible? If you have Medicare Part A or Medicare Part B, you can purchase a Prescription Drug Plan. No physical exam is required, and you cannot be denied coverage or charged more because of your current or past health conditions.
Not sure which Part D plan covers your specific medications?
Each plan sets its own premium for the calendar year, which is exactly why it’s wise to work with an experienced broker who can compare plans against your specific medications.
✓ 2026 Update — $2,100 Annual Out-of-Pocket Cap: Medicare Part D now includes a hard annual out-of-pocket maximum of $2,100 for covered prescription drugs. Once you reach this limit, you pay $0 for covered medications for the rest of the calendar year — a major change designed to protect beneficiaries from catastrophic drug costs.
Average 2026 Premium: $34.50/month (varies by plan and carrier)
Annual Out-of-Pocket Cap: $2,100 (2026)
Not always — it depends on what other coverage you already have.
If you already have creditable prescription drug coverage — coverage that is at least as good as Medicare’s standard Part D coverage — you may not need to sign up. Examples include employer or union health plans, TRICARE, or Veterans Affairs (VA) coverage.
If your Medicare Advantage Plan (Part C) already includes prescription drug coverage (an MAPD plan), you do not need a separate standalone Part D plan.
It can still be a good idea to purchase the lowest-cost plan available and hold on to it. You never know when you may suddenly need prescription medication — and signing up later can trigger a late enrollment penalty (see below).
If you don’t sign up for Part D when first eligible and don’t have other creditable coverage, you may face a permanent late enrollment penalty.
A 7-month window beginning 3 months before the month you turn 65, including your birthday month, and ending 3 months after.
⚠ How the penalty works: If you go without creditable prescription drug coverage for 63 consecutive days or more after your Initial Enrollment Period ends, you may owe a late enrollment penalty if you enroll later. The penalty is calculated as 1% of the “national base beneficiary premium” multiplied by the number of full, uncovered months you were eligible but didn’t have Part D or creditable coverage — and it’s added to your monthly premium permanently.
The national base beneficiary premium can increase or decrease each year, so your penalty amount may also change annually — but once assessed, the penalty itself generally applies for as long as you have Part D coverage.
Most Prescription Drug Plans organize medications into cost tiers. A typical structure looks like this, though plans can use more or fewer tiers:
| Tier | Drug Type |
|---|---|
| Tier 1 | Preferred Generics |
| Tier 2 | Generics |
| Tier 3 | Preferred Brand Names |
| Tier 4 | Non-Preferred Brand Drugs |
| Tier 5 | Specialty Drugs |
Yes. Higher-income beneficiaries pay an Income-Related Monthly Adjustment Amount (IRMAA) on top of their plan premium. IRMAA is based on your Modified Adjusted Gross Income (MAGI) from your tax return two years prior — so your 2026 premium is based on your 2024 income.
2026 IRMAA threshold: The surcharge applies if your 2024 MAGI was above $109,000 (individual) or $218,000 (married filing jointly). IRMAA is a cliff system — exceeding the threshold by even $1 triggers the full surcharge for that tier.
| Individual MAGI (2024) | Married Filing Jointly MAGI (2024) | 2026 Part D IRMAA (monthly) |
|---|---|---|
| $109,000 or less | $218,000 or less | $0 (plan premium only) |
| $109,001 – $137,000 | $218,001 – $274,000 | +$14.50 |
| $137,001 – $171,000 | $274,001 – $342,000 | +$37.40 |
| $171,001 – $205,000 | $342,001 – $410,000 | +$60.30 |
| $205,001 – $500,000 | $410,001 – $750,000 | +$83.20 |
| $500,001 or more | $750,001 or more | +$91.00 |
Figures based on 2026 CMS guidance. IRMAA brackets are adjusted annually. The Part D IRMAA surcharge is paid separately to Medicare — not to your plan carrier — and is typically deducted directly from your Social Security benefit.
“Extra Help” is a Medicare program specifically designed for this situation. It provides continuous drug coverage at low cost for people with limited income and savings — and could save you over $5,000 a year. Some State Pharmacy Assistance Programs offer similar support.
You must enroll with a private insurer that offers a standalone PDP, or choose a Medicare Advantage plan that includes drug coverage. There are literally hundreds of plan choices available — and they change from year to year.
This is where a local broker pays off. Finding a local insurance broker with the experience to evaluate your specific medications against available plans could save you hundreds, if not thousands, of dollars each year. Every plan must offer a minimum level of coverage required by law, but benefits, costs, and pharmacy networks vary — and “different” is sometimes better, depending on your needs.
Let us compare your medications against available Part D and MAPD plans in your area.
No. Every plan must offer a minimum level of coverage specified by law, but some offer better benefits, lower costs, and different pharmacy networks. Plans also change from year to year.
There are literally hundreds of different plan choices available, which is exactly why working with an experienced broker to narrow down the right options makes such a difference.
A standalone PDP pairs with Original Medicare or a Medigap plan. An MAPD (Medicare Advantage Prescription Drug) plan bundles drug coverage directly into your Medicare Advantage plan — you generally don’t need both.
Yes. The annual out-of-pocket cap applies across all Medicare Part D plans, including MAPD plans, for covered prescription medications.
Yes, during the Annual Election Period (October 15 – December 7), you can switch Part D plans, switch Medicare Advantage plans, or make other coverage changes for the upcoming year.
Medicare publishes detailed information every Fall in the Medicare & You handbook to help you choose and join a plan that suits your needs.
⚠ Medicare Disclaimer: This information is for educational purposes only and is not a complete description of benefits. Medicare plan availability and costs may vary by county. Contact a licensed Medicare agent for plan details. NISONA is an independent insurance agency and is not affiliated with Medicare or the Social Security Administration.
We want to make sure you get the coverage you need. With hundreds of Part D plans available, our friendly, knowledgeable advisors will compare your specific medications against available plans — no scripts, no pressure, no sales pitch.
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