List every prescription
Include the exact drug name, dosage, quantity and how often each prescription is filled.
Medicare Part D
The lowest premium is not always the lowest-cost plan. A useful comparison starts with your exact medications, dosage, pharmacy and expected yearly spending.
How Part D works
Medicare Part D helps pay for covered brand-name and generic prescription drugs. Coverage is offered by Medicare-approved private insurance companies.
Each plan has a formulary—its list of covered drugs—and places medications into cost-sharing tiers. Your cost can also depend on the deductible, coverage rules and whether your pharmacy is preferred by the plan.
You can receive Part D through a standalone prescription drug plan with Original Medicare or through most Medicare Advantage plans. Medigap policies sold today do not include prescription drug coverage.
A better comparison
Plan names and premiums tell only part of the story. The details below determine how the coverage works for you.
Include the exact drug name, dosage, quantity and how often each prescription is filled.
Confirm the formulary tier and look for prior authorization, step therapy or quantity limits.
The same medication can cost differently at a preferred, standard, mail-order or out-of-network pharmacy.
Add premiums and expected prescription costs instead of choosing a plan by premium alone.
What affects your cost
| Cost factor | Why it matters |
|---|---|
| Monthly premium | The recurring amount paid to keep the drug plan. A low premium does not necessarily mean the lowest total cost. |
| Yearly deductible | The amount you may pay before the plan begins paying its share. Some plans cover certain tiers before the deductible. |
| Drug tier | A plan groups covered medications into tiers that help determine your copay or coinsurance. |
| Pharmacy status | Preferred pharmacies may offer lower cost sharing than standard pharmacies under the same plan. |
| Coverage rules | Prior authorization, step therapy and quantity limits can affect how a covered prescription is accessed. |
| Yearly out-of-pocket limit | Covered Part D drug costs are capped annually; the Medicare-set amount can change each year. |
Premiums, deductibles, formularies, pharmacy networks and cost sharing can change each plan year.
2026 Part D protection
$2,100annual out-of-pocket cap for covered Part D drugsIn 2026, once your qualifying out-of-pocket spending for drugs covered by your plan reaches $2,100, you pay no copayment or coinsurance for covered Part D prescriptions for the rest of the calendar year.
This limit applies to covered Part D drugs. Premiums and costs for medications outside the plan's coverage do not work the same way.
The right order
A low premium cannot make up for an important medication being excluded or placed under difficult coverage rules.
Start with formulary coverage, tier and restrictions.
Combine plan premiums with expected prescription spending.
Compare preferred locations, mail order and convenience.

Personal prescription review
Justin reviews your exact prescriptions, dosage, pharmacy preferences and Medicare coverage before helping you compare available Part D options.
MedigapRx is based in Fort Lauderdale and provides personal Medicare guidance in Florida and additional licensed states—with annual reviews and support when coverage questions arise.
Review My PrescriptionsCommon questions
Part D is optional, but going 63 days or more without Part D or other creditable drug coverage after you are eligible may result in a late enrollment penalty if you enroll later.
No. The premium is only one part of the cost. A plan may also have a deductible, copays or coinsurance, and your costs depend on the medications and pharmacy you use.
Yes. People who keep Original Medicare and add a Medigap policy commonly choose a separate Part D plan for outpatient prescription coverage.
Usually not. Most Medicare Advantage HMO and PPO plans include Part D. If you want drug coverage, you generally need to choose a Medicare Advantage plan that includes it.
Yes. Formularies, pharmacy arrangements, premiums and cost sharing can change, and your medications may change too. An annual review helps confirm the plan still fits.
Your next step
Bring your medication list and preferred pharmacy for a personal Part D review.