This tool is for education and planning. It does not replace Medicare.gov, Social Security, SHIP, legal advice, tax advice, or a plan-specific coverage check.
Key takeaway: A Part D plan is not just a premium. Before you pick one, check your exact prescriptions, dosage, pharmacy, deductible, copays, restrictions, and total yearly cost in Medicare.gov Plan Finder.
What this Part D shopping tool does
This tool helps you...
- List every prescription you take, including dosage and refill schedule.
- Compare plan premiums, deductibles, copays, coinsurance, and estimated yearly drug costs.
- Check whether each medication is on the plan's formulary, which means the plan's covered drug list.
- Look for prior authorization, quantity limits, or step therapy before you enroll.
- Compare preferred, standard in-network, mail-order, and out-of-network pharmacy costs.
- Use Medicare.gov Plan Finder as the source of record before you trust a shortcut.
This tool does not...
- Replace Medicare.gov or the official plan documents.
- Recommend, rank, or endorse a carrier or plan.
- Guarantee that a drug, pharmacy, doctor, or cost will stay the same all year.
- Enroll you automatically.
- Require your Medicare number just to use the checklist.
- Tell you that one plan is best for everyone. Part D depends on your medications and pharmacy.
What to gather before you compare plans
Start with the boring details. They are the details that change the math.
- The exact name of each medication.
- The dosage, quantity, and how often you refill it.
- Whether you use brand-name, generic, or a specific formulation.
- Your preferred pharmacy and one backup pharmacy.
- Whether mail order works for any medication you take regularly.
- Any drug you may start soon, if your doctor has already discussed it with you.
How to compare a Part D plan without getting distracted
Look at total yearly cost first. A low premium can still be a poor fit if your drug is on a higher tier, has a high deductible, or costs more at your pharmacy.
Then check the formulary. Medicare says each Part D plan has its own formulary, and all plans must cover a wide range of prescription drugs that people with Medicare take. That does not mean every plan covers your exact medications the same way.
After that, check the pharmacy. Medicare explains that in-network pharmacies have contracts with plans, preferred in-network pharmacies may lower your out-of-pocket costs, and out-of-network pharmacies usually cost more.
The checks that matter most
| Check | Why it matters | What to write down |
|---|---|---|
| Formulary | The medication may be covered, excluded, or covered differently by plan. | Covered status and tier for each drug. |
| Restrictions | Prior authorization, quantity limits, and step therapy can change how easy it is to get the drug. | Any rule attached to the prescription. |
| Pharmacy | Preferred pharmacy pricing can be different from standard in-network pricing. | Your best local and mail-order option. |
| Total yearly cost | The premium is only one part of the bill. | Premium, deductible, copays, coinsurance, and estimated yearly drug cost. |
| Plan year | Part D formularies and costs can change each year. | The plan year you checked and the date you checked it. |
Use this as a shopping worksheet
- Enter your ZIP code in Medicare.gov Plan Finder.
- Add your prescriptions exactly as you take them.
- Add your preferred pharmacies.
- Sort by estimated yearly drug and premium cost, not just monthly premium.
- Open the details for any plan that looks close.
- Write down formulary tier, restrictions, deductible, and pharmacy pricing.
- Call the plan or pharmacy if a medication is expensive or unclear.
When to ask for help
Ask for help if one of your medications is expensive, missing from the formulary, or listed with a rule you do not understand. Ask again if two plans look similar but have different pharmacy costs. This is exactly the kind of Medicare detail that is easier to check before you enroll than after the plan year starts.
Official sources to check
- Medicare.gov Plan Finder
- Medicare.gov: What Part D drug plans cover
- Medicare.gov: What pharmacies can I use?
Related decisions
- Part D penalty calculator: check whether a gap in creditable drug coverage could add a penalty.
- Medicare Prescription Payment Plan calculator: think through whether spreading costs across the year may help after you choose coverage.