Understanding Medicare Part D Prescription Drug Coverage

James Neil | Jul 02 2025 14:00

Navigating the world of Medicare can be overwhelming—especially when it comes to understanding your options for prescription drug coverage. That’s where Medicare Part D comes in. This blog will break down how Medicare Part D prescription drug coverage works, who’s eligible, what the different coverage tiers mean, and how much you can expect to pay.

 

What Is Medicare Part D?

 

Medicare Part D is a federal program that helps Medicare beneficiaries pay for prescription drugs. It is offered through private insurance companies that are approved by Medicare, and you can get it as a stand-alone plan or as part of a Medicare Advantage plan (Part C) that includes drug coverage.

Who Is Eligible for Medicare Part D?

 

You’re eligible for Medicare Part D if:

  • You are enrolled in either Medicare Part A or Part B (or both).

  • You live in the service area of a Medicare Part D plan.

You can enroll during your Initial Enrollment Period (IEP), which begins three months before the month you turn 65 and lasts for seven months. If you miss this window, you can join during the Annual Enrollment Period from October 15 to December 7, but be aware that late enrollment penalties may apply.

How Does Medicare Part D Coverage Work?

 

Medicare Part D plans have a tiered structure, which means your medications are divided into different levels based on their cost and the type of drug. While specific tiers can vary from plan to plan, here’s a general breakdown:

  • Tier 1: Preferred generics (lowest copayment)

  • Tier 2: Non-preferred generics

  • Tier 3: Preferred brand-name drugs

  • Tier 4: Non-preferred brand-name drugs

  • Tier 5: Specialty drugs (highest copayment)

Each plan has its own formulary —a list of covered medications. It’s essential to make sure your prescriptions are included in the plan’s formulary before enrolling.

What Are the Costs?

 

There are three stages of costs in a typical Medicare Part D plan:

  1. Deductible Stage: If your Medicare plan has a deductible, you pay 100% of your drug costs until you meet the full deductible (up to $590 in 2025, depending on the plan).

  2. Initial Coverage Stage: After you reach your full deductible (if your plan has a deductible), you’ll pay 25% of the cost as coinsurance for your generic and brand-name drugs until your out-of-pocket spending on covered Part D drugs reaches $2,000 in 2025 (including certain payments made on your behalf, like through the Extra Help   program). Then, you’ll automatically get  "catastrophic coverage.”

  3. Catastrophic Coverage: After reaching the out-of-pocket limit, you pay nothing for covered drugs for the rest of the year.

Why Enroll Through Medicare Benefits Group?

 

At Medicare Benefits Group, we help you find the right Medicare Part D prescription drug coverage for your needs. We’ll walk you through comparing plans, understanding formularies, and calculating costs—so you don’t have to navigate it alone.

 

Need help choosing a Part D plan? Contact Medicare Benefits Group today for personalized guidance and peace of mind when it comes to your prescription drug coverage.