- Your prescriptions — Make sure each medication is on the plan’s formulary
- Drug tiers — Plans usually place drugs into cost levels that affect your copay or coinsurance
- Pharmacy network — Some plans charge less if you use preferred pharmacies
If you’re shopping for Medicare prescription drug coverage, one of the most important things to understand is that Part D costs can change as the year goes on.
Many people focus on the monthly premium, but the way a plan is structured can affect what you pay at the pharmacy, whether your medications are covered, and how much you spend after you’ve filled several prescriptions.
→ Ask a Doctor - Medical Consultation - CPS (US+) — free, takes about 60 seconds.
Part D plans are built around coverage phases. Those phases are not just insurance jargon — they help explain why a drug might cost one amount early in the year and another later.
If you know how the phases work, you can compare plans more effectively and avoid surprises.
What Medicare Part D covers
Medicare Part D helps cover outpatient prescription drugs, including many medications you pick up at a retail pharmacy or through mail order.
You can get this coverage through a stand-alone Part D plan if you have Original Medicare, or through many Medicare Advantage plans that include drug coverage.
Every plan has its own list of covered drugs, called a formulary. That means two plans can both be “Part D” and still cover different medications, use different cost-sharing rules, or require different pharmacies.
→ See what you could be approved for — free, takes about 60 seconds.
Before you compare plans, check these basics
- Your prescriptions — Make sure each medication is on the plan’s formulary.
- Drug tiers — Plans usually place drugs into cost levels that affect your copay or coinsurance.
- Pharmacy network — Some plans charge less if you use preferred pharmacies.
- Prior authorization or step therapy — The plan may require approval or try certain drugs first.
The main Part D coverage phases
Most Part D plans use a coverage structure that moves through different phases over the course of the year. The exact dollar amounts can change annually, and your plan’s rules matter, but the basic pattern is the same.
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