Medication-by-medication review
How to Compare Medicare Part D Plans Using Your Prescriptions
A plan with the lowest premium can be expensive when one medication is uncovered, placed on a costly tier or tied to a pharmacy you cannot conveniently use.
Quick answer: Compare Part D plans using the exact drug name, strength, form, quantity, refill frequency and pharmacies you can use. Then review the projected annual premium and drug cost, formulary tiers, restrictions and pharmacy access together.
What Information Should You Gather?
Prescription details
- Exact drug name
- Strength and dosage form
- Quantity and days’ supply
- How often it is refilled
Pharmacy details
- Specific local store locations
- Backup pharmacy
- Mail order, if practical
- Specialty-pharmacy needs
Bring the prescription bottles, a current pharmacy printout or the prescriber’s medication list. Do not omit a drug because it is inexpensive today; the plan still needs to cover it reliably.
Which Numbers Matter?
| Cost | Why it matters |
|---|---|
| Monthly premium | A predictable expense, but only one part of the annual total. |
| Part D deductible | Up to $615 in 2026; tiers may be treated differently. |
| Copayments or coinsurance | Varies by drug, tier, pharmacy and coverage stage. |
| Part D IRMAA | A separate income-related amount paid in addition to the plan premium when applicable. |
| Annual covered-drug cap | Qualifying out-of-pocket spending is capped at $2,100 in 2026. |
Use the full 2026 Part D cost guide to understand which expenses count toward the annual limit.
What Should You Check Beyond the Dollar Estimate?
- Whether every drug is on the formulary
- The tier assigned to each prescription
- Prior authorization, step therapy and quantity limits
- Preferred, standard and specialty-pharmacy requirements
- Transition-fill and exception procedures
- Customer-service and plan-quality information
A projected price assumes the information entered is correct and the plan processes the prescription as expected. Read the formulary and plan documents when a medication is essential or expensive.
Are You Comparing a Standalone PDP or an MAPD Plan?
Standalone Part D
Pairs with Original Medicare and is commonly used with Medigap. The comparison centers on prescriptions and pharmacies.
Medicare Advantage with Part D
The drug benefit is only one part of the decision. Doctors, hospitals, referrals, prior authorization and medical costs must also fit.
Enrolling in a standalone drug plan can disenroll you from many Medicare Advantage plans. Confirm the effect before submitting an application.
Why Should You Recheck the Plan Every Fall?
Part D premiums, formularies, tiers, restrictions and pharmacy contracts can change for January 1. Your medications can also change during the year.
- Read the Annual Notice of Change.
- Update the medication and pharmacy list.
- Run a new Medicare Plan Compare comparison.
- Review all coverage—not only the item that changed.
- Submit an election only after verifying effective dates and plan compatibility.
If a current plan removes a medication or changes its coverage, use the guide to what to do when a Medicare plan no longer covers a prescription.
Brokerage scope: Thompson Medicare Brokerage can compare the Medicare plans it represents in Missouri and Illinois. Medicare.gov and 1-800-MEDICARE provide information about all plans available in your area.
Part D Plan Comparison Questions
Should I choose the Part D plan with the lowest premium?
Not automatically. Compare premium and expected drug costs together, using the exact prescriptions and pharmacies you use.
Can two pharmacies show different prices for the same plan?
Yes. Preferred and standard network status, supply length and negotiated pricing can change the member cost.
What if Medicare Plan Compare shows my drug as not covered?
Check the exact spelling, strength and formulation. Then review covered alternatives and whether an exception may be appropriate.
Do I need to compare every year if my prescriptions did not change?
Yes. The plan’s premium, formulary, cost sharing, restrictions or pharmacy network may change for the new year.
Can a standalone Part D plan be added to any Medicare Advantage plan?
No. Adding a standalone PDP can disenroll someone from many Medicare Advantage plans. Verify compatibility before enrolling.
Explore the Complete Part D Series
Start with the hub or go directly to the cost, formulary, pharmacy, enrollment or plan-comparison question you need to solve.
Official Sources
Compare Part D Coverage Using Your Actual Prescriptions
Thompson Medicare Brokerage helps people in Missouri and Illinois compare the Medicare plans we represent using their medications, dosages, pharmacies and expected yearly costs. Consultations are no-cost and no-obligation.
Thompson Medicare Brokerage is a non-government insurance agency. This page provides general educational information and is not medical advice. Plan availability, formularies, pharmacy networks, premiums, cost sharing, restrictions and enrollment rights vary by plan, location and year. Check current plan documents and official Medicare information.