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How can I pick the best Medicare Part D prescription drug plan for my needs?


Your goal in choosing a Medicare Part D prescription drug plan is to select a plan that:

  • Covers all your drugs with the lowest out-of-pocket cost.
  • Provides good service.
  • Checks the box on any other personal requirements you might have.

But Part D plans can change their costs and coverage every year, just as the prescription drugs you take can change. And there are a lot of options out there, so consider this when selecting a plan.

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Depending on your state, you may have from 15 to 24 stand-alone Part D plans to choose from in 2024, according to KFF, formerly the Kaiser Family Foundation. Comparing that many plans can be overwhelming, but several tools and resources can help you assess the right plan for your needs.

Here’s how to determine your best Part D plan when you first sign up or during Medicare’s annual open enrollment period from Oct. 15 to Dec. 7 for coverage starting January 1.

Tip: Don’t look just at a plan’s premiums. Also compare the coverage and total costs for your medications. Your answers to these questions will help narrow the field.

How does the Part D plan cover my prescriptions?

Using the Medicare Plan Finder, make sure the drugs you take are part of a plan’s formulary, what insurers call a list of covered drugs. Otherwise, you’ll pay full price for drugs that your plan won’t cover.

After you’ve entered all of your medications, you can see how much you’ll pay for them with each plan. Two plans that cover your medicines may have very different costs, depending on the copayments they charge for your drugs.

To find potential costs in the Plan Finder, type in your ZIP code, choose Medicare drug plan (Part D) and type in your drugs, dosages and the pharmacies you use. You can sort plans by Lowest drug + premium cost. Click on Plan Details to see how much you would pay for your medications under each plan. You’ll also see an estimate of your drug costs by month.

Most Part D plans have four or five pricing tiers, starting with the lowest copayments:

  • Preferred generic medications.
  • Generics not on the preferred list.
  • Preferred brand-name drugs.
  • Other brand-name drugs.
  • A separate high-priced tier for specialty medications (on some, not all).
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That’s not how you’ll see the information presented in the Plan Finder, but this can help you understand why you might see different prices for the same prescription when you compare plans in your area.

You may uncover other information by going to the website of a plan you’re interested in, including how the plan regulates your medicines. You’ll want to know whether a plan imposes any restrictions, such as requiring your doctor to complete prior authorization forms before a drug will be covered or using a lower-cost drug before the plan will cover a similar but more expensive medication. That’s known as step therapy.

Other options: Call 800-MEDICARE (800-633-4227) for help, or work with representatives from your State Health Insurance Assistance Program (SHIP).

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Does the Part D plan cover the pharmacies I use?

This can be just as important in determining the price you pay for your prescriptions as the plan’s formulary. Many Part D plans have preferred pharmacies that charge lower copayments than other pharmacies in the plan’s network.

You can enter up to five pharmacies in the Plan Finder to determine if they’re preferred in-network pharmacies, standard in-network pharmacies that have higher copayments, or not in a plan’s network. Click view your pharmacies to see what your out-of-pocket costs would be for your medications at different pharmacies.

One example: If you use a preferred in-network pharmacy, the least expensive Part D plan in one area could charge $0 for a 30-day supply of 5 milligrams of amlodipine, the generic equivalent of the blood pressure medication Norvasc. The same prescription could be more than $40 per year at another in-network pharmacy that’s not on the plan’s preferred list and more than $600 at a nearby out-of-network pharmacy.

What are the total costs for the plan and my drugs?

Several factors can affect the total cost for a Part D plan during the year, including premiums, deductibles and copayments for your medications. Plans were allowed to charge a deductible of up to $505 in 2023, and that will rise to $545 in 2024, while some plans have no deductible.

Video: Will Medicare Part D Pay for All of My Prescription Drugs?

Premiums can vary, but a plan with low premiums may cost you more if it has high copayments for your drugs. When you’re in the Plan Finder, you can sort the plans by Lowest drug + premium cost to find out which plan’s total costs will be least expensive for you for the year.

The Plan Finder also shows your estimated total monthly drug costs for each plan. That can be helpful if you’re looking for a plan that spreads expenses throughout the year rather than charging the biggest bills in the first few months.

Part D currently has no coverage caps, but after you spend $7,400 out of your pocket in 2023, you reach Medicare’s catastrophic coverage level. After that, you pay 5 percent or less of your drugs’ retail costs.

The Inflation Reduction Act of 2022 changed the rules starting in 2024. You’ll reach the catastrophic level after spending $8,000 out of pocket, and you won’t have to pay additional costs the rest of the year. Starting in 2025, out-of-pocket costs are capped at $2,000 for people who have Part D.

How does the Part D plan rate for customer service?

The Plan Finder can show you each plan’s star ratings, which the Centers for Medicare & Medicaid Services award to Part D and Medicare Advantage plans based on several quality measures. For Part D plans, the categories include accuracy of pricing, complaints, customer service and members’ experiences. 

Five stars is the highest rating; one star is the lowest. Part D plans receive star ratings based on up to 12 measures, as well as an overall star rating.

Keep in mind

  • Three ways to enroll. After you find the best prescription drug plan for your needs, you can sign up through the Medicare Plan Finder, by calling the Medicare help line at 800-MEDICARE (800-633-4227) or by contacting the plan directly. You can also find contact information for Part D plans in your area in the Plan Finder or by calling the Medicare help line, as well as by reaching out to your State Health Insurance Assistance Program (SHIP).
  • One plan at a time. If you switch to another Part D plan, the old one is automatically canceled as soon as the new coverage becomes effective. If you switch plans during the open enrollment period of Oct. 15 to Dec. 7, your new coverage automatically begins Jan. 1.
  • Financial help is available. If your income is below a certain level, you can qualify for the Extra Help program, which can help pay your Part D premiums and copayments. Eligibility is expanding in 2024.

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