Medicare Part D: The Complete 2026 Prescription Drug Coverage Guide

Plans, costs, penalties and enrollment explained in plain English — with a licensed agent one call away at 1-800-MEDIGAP.

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Quick answer

Medicare Part D is optional prescription drug coverage sold by private insurers approved by Medicare. In 2026, out-of-pocket drug costs are capped at $2,100 per year, the coverage gap (donut hole) is eliminated, and the base premium averages about $40/month, per CMS.

Medicare Part D helps pay for the prescription drugs you fill at the pharmacy. This guide breaks down how it works in 2026 and how to choose a plan that fits your medications.

What is Medicare Part D and who needs it?

Medicare Part D is voluntary prescription drug coverage offered through private insurance plans approved by Medicare. Original Medicare (Part A and Part B) does not cover most retail prescription drugs, so Part D fills that gap. You can get it as a standalone Prescription Drug Plan (PDP) that pairs with Original Medicare and a Medigap policy, or built into a Medicare Advantage plan (MA-PD). Roughly 50 million Americans have Part D coverage, according to KFF. Even if you take few medications today, enrolling when first eligible protects you from lifelong late penalties. A licensed agent at 1-800-MEDIGAP can confirm whether you need a plan.

How much does Medicare Part D cost in 2026?

Part D costs include a monthly premium, an annual deductible, and copays or coinsurance per prescription. In 2026, the maximum deductible a plan can charge is $615, and the base beneficiary premium averages about $40 per month, per CMS. Premiums vary by plan and region. Higher-income enrollees pay an income-related monthly adjustment (IRMAA) on top of the premium. The biggest 2026 change: your total out-of-pocket spending on covered drugs is capped at $2,100, after which you pay $0 for covered medications for the rest of the year.

What changed for Part D in 2026?

The Inflation Reduction Act reshaped Part D. As of 2025 the coverage gap, or donut hole, was eliminated, and for 2026 the annual out-of-pocket cap rises to $2,100. Insulin is capped at $35 per month, and many adult vaccines (like shingles) are free. The Medicare Prescription Payment Plan lets you spread your out-of-pocket drug costs into monthly installments instead of paying a large amount at the pharmacy. These protections apply to every Part D and Medicare Advantage drug plan nationwide.

When can you enroll in Medicare Part D?

Your first chance is your Initial Enrollment Period — the seven-month window around your 65th birthday (three months before, your birthday month, and three months after). After that, the Annual Enrollment Period runs October 15 to December 7 each year, when you can join, switch, or drop a plan for the following year. If you miss your initial window and lack other creditable drug coverage, you may owe a permanent late enrollment penalty. Special Enrollment Periods exist for events like losing employer coverage or moving. Call 1-800-MEDIGAP to find your window.

How do you choose the right Part D plan?

The best plan is the one that covers your specific drugs at the lowest total yearly cost — not just the lowest premium. Start by listing your medications, then check each plan's formulary (its covered-drug list) and pricing tiers. A $0-premium plan can cost more overall if your drugs sit in expensive tiers or require prior authorization. Also confirm your pharmacy is in-network. Comparing plans every year matters because formularies and prices change annually. Our licensed agents at 1-800-MEDIGAP run your drug list against available plans at no cost to you.

Explore Part D & Prescription Drugs

Medicare Part D Medicare Prescription Payment Plan Medicare Prescription Drug Plans 2026 Medicare Part D Formulary Part D Late Enrollment Penalty Medicare Part D Out-of-Pocket Maximum 2026 Medicare Donut Hole 2026 Creditable Drug Coverage Medicare Extra Help Low-Income Subsidy How to Qualify for Extra Help Best Part D Plan 2026 Compare Part D Plans 2026

Frequently asked questions

Is Medicare Part D mandatory?+

No. Part D is optional, but if you go without creditable drug coverage after becoming eligible, you may owe a permanent late enrollment penalty when you eventually sign up. Most people enroll when first eligible to avoid that lifelong cost, even if they take few medications.

What is the Part D out-of-pocket maximum in 2026?+

In 2026, your out-of-pocket spending on covered Part D drugs is capped at $2,100. Once you reach it, you pay nothing for covered medications for the rest of the calendar year. This cap applies to all Part D and Medicare Advantage drug plans, per CMS.

Does Part D cover all my medications?+

Not necessarily. Each plan has a formulary — its own list of covered drugs organized into cost tiers. Two plans can cover the same drug at very different prices, and some require prior authorization. Always check that your specific medications are covered before enrolling.

Can I have Part D with a Medigap plan?+

Yes. If you have Original Medicare and a Medigap (Medicare Supplement) policy, you add a standalone Part D Prescription Drug Plan for your medications. Medigap policies sold today do not include drug coverage, so a separate Part D plan is how you cover prescriptions.

How much is the Part D late enrollment penalty?+

The penalty equals 1% of the national base beneficiary premium for each full month you went without creditable drug coverage after eligibility. It is added to your premium permanently for as long as you have Part D, and it rises as the base premium changes each year.

What is the Medicare Prescription Payment Plan?+

It is a 2025-and-later option that lets you pay your out-of-pocket Part D drug costs in monthly installments instead of all at once at the pharmacy. It does not lower your total cost, but it smooths large bills over the year. Enrollment is free and voluntary.

Did the donut hole go away?+

Yes. The Part D coverage gap, known as the donut hole, was eliminated starting in 2025. For 2026, coverage moves through a deductible phase and an initial phase until you reach the $2,100 out-of-pocket cap, after which covered drugs cost you $0.

How do I get free help choosing a Part D plan?+

Call 1-800-MEDIGAP (1-800-633-4427). A licensed agent will take your medication list, compare available plans in your area, and help you enroll at no cost. We also explain Extra Help, penalties, and how Part D works with Medigap or Medicare Advantage.

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