Prescription medications are a fact of life for most Medicare beneficiaries — and without the right coverage, those costs can add up fast. That is where Medicare Part D comes in. It is the part of Medicare specifically designed to help cover prescription drug costs.

But Part D can feel confusing with its coverage stages, formularies, and annual changes. This guide breaks it all down in plain English so you can make a smart choice about your Medicare Part D coverage.

What Is Medicare Part D?

Medicare Part D is a voluntary prescription drug benefit available to everyone enrolled in Medicare. It is offered through private insurance companies approved by Medicare — not through the government directly.

You can get Part D coverage in two ways:

• Standalone Prescription Drug Plan (PDP) — pairs with Original Medicare and a Medigap plan
• Medicare Advantage plan with drug coverage (MA-PD) — bundles Part D into your Medicare Advantage plan

What Does Part D Cover?

Part D plans cover a wide range of prescription medications, organized into a formulary (the plan list of covered drugs). Each plan formulary is different, so it is critical to verify that your specific medications are covered before enrolling.

Part D plans typically organize drugs into tiers:

• Tier 1 — Preferred generics (lowest cost)
• Tier 2 — Non-preferred generics
• Tier 3 — Preferred brand-name drugs
• Tier 4 — Non-preferred brand-name drugs
• Tier 5 — Specialty drugs (highest cost)

How Do the Coverage Stages Work?

Thanks to the Inflation Reduction Act, Medicare Part D coverage stages were simplified starting in 2025. Here is how they work in 2026:

Stage 1: Annual Deductible

You pay 100% of your drug costs until you reach the annual deductible of $615 in 2026. Some plans cover certain generic drugs before you meet the deductible.

Stage 2: Initial Coverage

After meeting your deductible, you pay 25% of drug costs and your plan pays 75%. This continues until your total drug costs reach a set threshold.

Stage 3: Catastrophic Coverage

Once your true out-of-pocket spending reaches the annual cap of approximately $2,150 in 2026, you pay $0 for covered drugs for the rest of the year.

What Happened to the Donut Hole?

Good news — the infamous Medicare donut hole (coverage gap) was eliminated as of January 1, 2025. Previously, beneficiaries faced a period where they paid a higher percentage of drug costs. Now, thanks to the Inflation Reduction Act, you move directly from the initial coverage period to catastrophic coverage with a hard out-of-pocket cap.

Key Part D Benefits for 2026

• $2,150 annual out-of-pocket cap — no more unlimited drug spending
• $35/month insulin cap — applies to all insulin products under Part D
• Free adult vaccines — all recommended vaccines covered at $0
• Medicare Prescription Payment Plan — spread your drug costs into predictable monthly payments throughout the year
• Drug price negotiation — Medicare can now negotiate prices on select high-cost drugs

How to Choose the Right Part D Plan

Not all Part D plans are created equal. Here is what to compare:

• Formulary coverage — Are your specific medications covered?
• Monthly premium — base premium averages around $41/month in 2026
• Pharmacy network — Is your preferred pharmacy included?
• Tier placement — Where do your drugs fall on the cost tiers?
• Star rating — Medicare rates plans 1-5 stars for quality and service

Need help finding the right Part D plan for your medications?
Call 1-888-781-6026 — our licensed advisors compare plans at no cost to you.

Can I Get Part D Through Medicare Advantage?

Yes. Most Medicare Advantage plans include Part D drug coverage. These are called MA-PD plans. If you enroll in a Medicare Advantage plan with drug coverage, you do not need a separate standalone Part D plan.

When to Enroll in Part D

• Initial Enrollment Period — 7-month window around your 65th birthday
• Annual Election Period — October 15 through December 7 each year
• Special Enrollment Periods — if you lose other creditable drug coverage

Important: If you delay enrollment without other creditable coverage, you may face a late enrollment penalty — an extra 1% of the national base premium for each month you were without coverage.

Frequently Asked Questions

Is Medicare Part D required?

No, but if you do not have other creditable drug coverage and delay enrolling, you will pay a permanent late enrollment penalty.

How much does Part D cost?

Premiums vary by plan and location. The 2026 national base premium is approximately $41/month, but actual premiums range from under $10 to over $100 depending on the plan.

Can I change my Part D plan?

Yes, during the Annual Election Period (October 15 – December 7) each year. Review your plan annually since formularies, premiums, and pharmacy networks can change.

Get Help Choosing the Right Part D Plan

The right Part D plan depends on your specific medications, your preferred pharmacy, and your budget. Our licensed advisors make the comparison easy.

Call 1-888-781-6026 for a free Part D plan comparison.

Or visit eMedicareGuide.com to get started.