What is Medicare Part D

Elder Care Planning

What is Medicare Part D?

Looking for more information on the four parts of Medicare? Here are more details on Medicare Part D, Medicare’s Prescription Drug Benefit.

Lynda Menegotti

Lynda Menegotti brings a deeply personal understanding of caregiving, shaped by years of supporting loved ones through ALS, cancer, and long-distance family care challenges. Through her work with Caring Village, she is passionate about helping families navigate the caregiving journey with compassion, support, and practical resources.

May 29, 2026

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Did you know that in 2016, roughly 41 million (of the 55 million people on Medicare) were enrolled in Medicare Part D (source)? If 41 million people have it – you may be wondering what Part D is, and whether or not you should get it. So far, we’ve explained at a high-level what Medicare is and given a brief overview of its four parts which include Parts A and B (referred to as Original Medicare), and Medicare Part C (Medicare Advantage Plans). Here is more information about Medicare Part D –  Medicare’s Prescription Drug Benefit.

What is Medicare Part D?

Medicare Part D is the prescription drug benefit option for those already enrolled in Medicare Part A and/or B. It is a voluntary outpatient prescription drug benefit for those on Medicare. The plans are operated by private insurance companies that follow the rules of Medicare. If you want to get Part D coverage, you have to select this option and enroll in a private Medicare prescription drug plan (PDP) or a Medicare Advantage Plan with drug coverage (MAPD).

How Much Does Part D Cost?

According to the Center for Medicare and Medicaid Services (CMS), the 2017 Part D base beneficiary premium range is from $10-$100 per month. The costs for the drugs themselves will vary by the plan purchased and the cost of the prescription under that plan.

Can I Get Drug Coverage if I Opt Out of Part D?

Yes, if you are enrolled in a Medicare Advantage Plan (Part C) then you are able to receive prescription drug coverage. Through Part C coverage you will have access to both medical services and prescription drugs. This is a good option for people who choose to receive all their Medicare benefits in one policy, usually through a health maintenance organization (HMO) or a preferred provider organization (PPO).

Under Part B, you are eligible for a limited set of drugs. Medicare Part B covers injectable and infusible drugs administered often by a physician and not at home.

How Do You Join a Medicare Drug Plan?

Visit the Medicare Plan Finder on Medicare’s website – Medicare.gov. There you can review the plans available and make the best decision possible. Once you choose a Medicare drug plan (part C or Part D), you can join by:

  • Enrolling on the Medicare Plan Finder or on the plan’s website.
  • Completing a paper enrollment form.
  • Call 1-800-MEDICARE (1-800-633-4227)