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Medicare Part D 2027: Drug Coverage, Costs and How to Choose a Plan

Reviewed by Russell Noga, Licensed Medicare Insurance Broker (all 50 states) — Last updated October 21, 2026

Key Takeaway

In 2027, Part D out-of-pocket drug costs are capped at $2,400 for the year, and the highest allowed deductible is $700. If you have a Medicare Supplement plan, a standalone Part D plan is how you get drug coverage.

Medicare Part D is prescription drug coverage from private insurance companies approved by Medicare. Original Medicare and Medicare Supplement plans do not cover most prescriptions, so a Part D plan fills that gap. This guide covers what Part D pays for, what it costs in 2027, when to enroll and how to choose the right plan for your medications.

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How Medicare Part D Works

Part D plans are sold by private insurance companies. Each plan has its own list of covered drugs, called a formulary, and its own premium, deductible and copays.

✔
You need Medicare Part A or Part B to join a Part D plan
✔
Standalone Part D plans work with Original Medicare and a Medicare Supplement plan
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Most Medicare Advantage plans already include drug coverage
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Each plan sorts drugs into tiers, and lower tiers usually cost less
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Plans can change their formulary, premium and costs every year

Part D Costs in 2027

Medicare Part D 2027 cost stages: up to $700 deductible, copays, then $0 after $2,400 out of pocket

CMS sets the limits every plan must follow. For 2027, the key numbers are:

Part D cost 2026 2027
Highest allowed deductible $615 $700
Yearly out-of-pocket cap $2,100 $2,400
Insulin, per month’s supply $35 max $35 max
Average standalone plan premium About $35 About $36

Source: CMS 2027 Medicare Part D figures. Premiums and deductibles vary by plan and area.

Good to know: Once your out-of-pocket drug costs reach $2,400 in 2027, you pay $0 for covered drugs for the rest of the year.

The 3 Part D Coverage Stages

Your costs change as you fill prescriptions through the year.

1. Deductible

✔You pay full price for covered drugs
✔Up to $700 in 2027
✔Some plans have no deductible

2. Initial Coverage

✔You pay a copay or coinsurance
✔Your plan pays the rest
✔Lasts until you hit the yearly cap

3. Catastrophic

✔Starts at $2,400 out of pocket
✔You pay $0 for covered drugs
✔Lasts the rest of the year

See Medicare Supplement and Part D options in your area

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Medicare Supplement and Part D Work Together

A Medicare Supplement plan covers your share of hospital and doctor costs, but plans sold today do not include drug coverage. That is why most people pair their Medicare Supplement plan with a standalone Part D plan.

Medicare Supplement

✔Hospital and doctor costs
✔Any doctor that takes Medicare
✔Predictable yearly costs

Part D Drug Plan

✔Prescription drugs
✔Choose a plan that covers your medications
✔$2,400 yearly cap in 2027

Don’t skip Part D: Even if you take few medications today, going without Part D or other creditable drug coverage can lead to a lifelong late enrollment penalty.

When to Enroll in Medicare Part D

Medicare Part D enrollment periods: initial enrollment, October 15 to December 7, and late penalty

Part D has its own enrollment periods, separate from your Medicare Supplement open enrollment window.

Initial Enrollment

✔7 months around your 65th birthday
✔Join without a penalty
✔Line it up with your Medicare Supplement plan

Annual Enrollment

✔October 15 to December 7
✔Join, switch or drop a plan
✔New coverage starts January 1

Special Enrollment

✔Moving, losing coverage or other events
✔Limited time to act
✔Rules vary by situation

The Part D Late Enrollment Penalty

If you go 63 days or more in a row without Part D or other creditable drug coverage after your Initial Enrollment Period ends, Medicare adds a penalty to your premium.

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The penalty is 1% of the national base premium for each full month you went without coverage
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It is added to your monthly premium for as long as you have Part D
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Creditable coverage from an employer or union can protect you from the penalty
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People who qualify for Extra Help do not pay the penalty

How to Choose a Part D Plan

1
List your medications. Write down every drug, dose and how often you take it.
2
Check each plan’s formulary. Make sure your drugs are covered and see which tier they are on.
3
Compare total yearly cost. Add the premium, deductible and copays, not just the monthly premium.
4
Check your pharmacies. Preferred pharmacies can lower your copays.
5
Review your plan every fall. Formularies and costs change each year, so compare again from October 15 to December 7.

See how each company scored in the official 2027 CMS ratings in our guide to the best Medicare Part D plans.

The Bottom Line

A Medicare Supplement plan and a Part D plan together give you broad coverage for doctors, hospitals and prescriptions. A licensed insurance agent at MedigapWise can help you compare both at no cost.

Compare Medicare Supplement and Part D plans

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Medicare Part D 2027 — Frequently Asked Questions

➤ What is Medicare Part D?

Medicare Part D is prescription drug coverage sold by private insurance companies approved by Medicare. You can buy it as a standalone drug plan to go with Original Medicare and a Medicare Supplement plan, or get it built into most Medicare Advantage plans.

➤ What is the Part D out-of-pocket maximum for 2027?

In 2027, your out-of-pocket costs for covered Part D drugs are capped at $2,400 for the year. Once you reach that amount, you pay nothing more for covered drugs for the rest of the year.

➤ What is the highest Part D deductible in 2027?

Part D plans can charge a deductible of up to $700 in 2027, up from $615 in 2026. Many plans have a lower deductible, and some have none.

➤ Do I need Part D if I have a Medicare Supplement plan?

Medicare Supplement plans sold today do not cover prescription drugs, so most people with a Medicare Supplement plan also buy a standalone Part D plan. Skipping it without other creditable drug coverage can lead to a late enrollment penalty.

➤ When can I enroll in Medicare Part D?

You can first enroll during your Initial Enrollment Period, the 7 months around your 65th birthday. After that, you can join or change plans each year during the Annual Enrollment Period, October 15 to December 7, with coverage starting January 1.

➤ What is the Part D late enrollment penalty?

If you go 63 days or more without Part D or other creditable drug coverage after your Initial Enrollment Period, a penalty is added to your premium. It equals 1% of the national base premium for each full month you went without coverage, and you usually pay it for as long as you have Part D.

➤ How much does a Part D plan cost in 2027?

Premiums vary by plan and area. CMS projects the average standalone Part D premium at about $36 a month for 2027, and many areas have plans that cost much less. Your total cost also depends on your drugs, deductible and copays.

➤ Is insulin covered by Part D?

Yes. Covered insulin costs no more than $35 for a month’s supply under Part D, and you do not have to meet your deductible first.

➤ Can I spread my drug costs out over the year?

Yes. The Medicare Prescription Payment Plan lets you pay your out-of-pocket drug costs in monthly amounts across the year instead of all at once at the pharmacy. You can sign up through your Part D plan.

➤ Does it cost anything to compare Part D plans with MedigapWise?

No. Our licensed insurance agents can help you compare Part D plans alongside your Medicare Supplement plan at no cost, and you are never required to enroll.

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