Medicare Part D Overview

By Eric Hood from AdobeStock

If you’ve been researching Medicare, you have probably seen Medicare Part D coverage mentioned frequently.

But what is Medicare Part D?

This overview provides a simple explanation of what Medicare Part D coverage is, who may benefit from it, and how it works.

What Is Medicare Part D?

Medicare Part D helps cover the cost of many brand-name and generic prescription drugs. Coverage is available through:

• A standalone Prescription Drug Plan (PDP) that works alongside Original Medicare
• A Medicare Advantage Prescription Drug plan (MAPD), which combines medical and prescription drug coverage into one plan

Each plan has its own list of covered medications, known as a formulary, along with its own costs and pharmacy network.

Who Can Enroll in a Part D Plan?

To enroll in a Medicare Part D plan, you must:

• Be enrolled in Medicare Part A and/or Part B
• Live in the plan’s service area.

Even if you do not currently take prescription medications, enrolling when first eligible may help you avoid a late enrollment penalty later on.

What Does Medicare Part D Cover?

Part D plans generally cover many commonly prescribed medications, including drugs used to treat:

• High blood pressure
• Diabetes
• High cholesterol
• Infections
• Chronic health conditions

Plans are required to cover a broad range of medications across different therapeutic categories, but covered drugs and costs can vary by plan.

Choosing the Right Plan

When comparing Medicare Part D plans, it’s important to review:

• Whether your prescriptions are covered
• Preferred pharmacy options
• Monthly premium costs
• Deductibles and copays
• Estimated annual out-of-pocket expenses

Because plans and formularies can change each year, reviewing your coverage annually is recommended.

Understanding Medicare Part D Costs

Medicare Part D plans can include several types of costs, depending on the plan you choose and the medications you take. These may include:

• Monthly Premium – The amount you pay each month to maintain coverage
• Deductible – The amount you may pay out of pocket before the plan begins to help with costs.
• Copays or Coinsurance – Your share of the cost for covered prescriptions
• Out-of-Pocket Expenses – Total yearly drug costs can vary based on your prescriptions and pharmacy usage

Many plans also offer lower costs when using preferred in-network pharmacies.

When Can You Enroll?

You can typically enroll in a Medicare Part D plan during:

• Your Initial Enrollment Period when you first become eligible for Medicare
• The Annual Enrollment Period (October 15 – December 7)
• Certain Special Enrollment Periods, if you qualify

Got Medicare Questions?

This information is for educational purposes only and is not affiliated with or endorsed by Medicare or the federal government. Benefits, premiums, formularies, and provider networks may change annually.