The best Part D plan is the plan that covers your prescriptions at the pharmacies you actually use. The lowest premium may not produce the lowest total cost.
Enter the full medication list
Use Medicare Plan Compare and enter the exact drug, dosage, quantity and frequency. Add preferred pharmacies and mail order if you would use it.
Check six details
- Is every medication on the formulary?
- Which tier applies?
- Are prior authorization, step therapy or quantity limits required?
- Is your pharmacy preferred or merely in network?
- What are the deductible, premium and expected annual cost?
- What happens if a medicine changes?
2026 protections and limits
No Part D plan may have a deductible above $615 in 2026. Out-of-pocket spending on covered Part D drugs is capped at $2,100. The Medicare Prescription Payment Plan can spread out-of-pocket prescription costs through the calendar year, but it does not reduce the total cost.
Review every fall
Plans can change premiums, formularies, tiers and pharmacy contracts. Read the Annual Notice of Change and repeat the comparison during the October 15 through December 7 Annual Enrollment Period. Keep proof of creditable drug coverage if you delay Part D.In the RetireNerd Medicare Series
- Medicare Explained: The Complete, Easy-to-Follow Guide
- How Much Does Medicare Cost in 2026? A Realistic Monthly Budget
- Medicare for Married Couples: What Spouses Need to Handle Separately
- Does Medicare Cover Dental, Vision and Hearing?
- What Does Medicare Cover for Free? Preventive Services Explained
- What Medicare Does Not Cover: 10 Gaps to Plan For
- Original Medicare vs. Medicare Advantage: How to Choose
- When to Sign Up for Medicare: Deadlines, Work Coverage and Penalties
- Medicare Part D: How to Compare Drug Plans Every Year
Official resources
- Medicare.gov
- Medicare Plan Compare
- Free, unbiased SHIP counseling
- Sign up for Medicare through Social Security
Educational information only. Medicare rules, costs and plan details can change. Confirm decisions with Medicare, Social Security, your current benefits administrator and a licensed professional when appropriate.