Choosing the wrong Part D prescription drug plan can cost you hundreds or even thousands of dollars each year. The best plan depends on your specific medications, preferred pharmacy, and whether your drugs are listed on the plan's formulary at a favorable tier. Thanks to the Inflation Reduction Act of 2022, 2026 is shaping up to be the best year ever for Part D coverage, with an out-of-pocket cap that significantly lowers costs.
Using the Medicare Plan Finder
The Medicare Plan Finder on Medicare.gov is your most powerful tool for comparing Part D plans. To get started, visit the website and enter your zip code, current medications, and preferred pharmacy. The tool will show you plans available in your area, estimated annual costs, and coverage details.
Formulary Tiers: Why the Same Drug Costs Different Amounts
Plans organize their covered drugs into tiers, typically ranging from Tier 1 (lowest cost, generic drugs) to Tier 5 (highest cost, specialty drugs). The same drug can be on different tiers across plans, so it's important to check where your medications fall. A plan with a low premium might have higher copays for your specific drugs, making it more expensive overall.
Pharmacy Networks: Preferred vs. Standard Savings
Most Part D plans have network pharmacies. Using a "preferred" pharmacy in your plan's network can reduce your costs significantly. Standard pharmacies may still be covered but at higher copays. Always verify that your go-to pharmacy is in the plan's preferred network before enrolling.
The 2026 Out-of-Pocket Cap and Prescription Payment Plan
In 2026, the Inflation Reduction Act introduces a $2,000 out-of-pocket cap on Part D drug costs. Once you spend that amount in a calendar year, you pay nothing for covered drugs for the rest of the year. Additionally, the Prescription Payment Plan allows you to spread your costs over monthly payments, making high-cost drugs more manageable.
The Ten Negotiated Drugs and IRA Savings
For the first time, Medicare has negotiated prices on ten high-cost drugs. These negotiated prices apply to Part D plans starting in 2026, potentially saving enrollees billions. If you take any of these drugs—such as Eliquis, Jardiance, or Xarelto—you'll see lower costs at the pharmacy.
Late Enrollment Penalty and Annual Plan Review
If you go without creditable prescription drug coverage for 63 days or more after your initial enrollment period, you may incur a late enrollment penalty. This penalty adds to your monthly premium permanently. To avoid this, enroll in a Part D plan as soon as you're eligible. Each year during the Annual Enrollment Period (October 15 to December 7), review your plan because formularies, premiums, and networks change.
Putting It All Together: Your Part D Shopping Checklist
- Make a list of all your current prescriptions, including dosages and frequencies.
- Identify your preferred pharmacy.
- Visit Medicare.gov and use the Plan Finder to compare plans.
- Check each plan's formulary to see which tier your drugs are on.
- Estimate your total annual costs, including premiums, deductibles, and copays.
- Consider the out-of-pocket cap and whether you might benefit from the Prescription Payment Plan.
- Verify pharmacy network preferences.
- Enroll during the Annual Enrollment Period or a Special Enrollment Period if you qualify.
By following this step-by-step process, you can confidently select a Part D plan that meets your needs and saves you money in 2026.