What is the Part D late enrollment penalty?

If you go 63 or more days without creditable drug coverage after becoming eligible, Medicare adds 1 percent of the national base premium to your Part D premium for every month you waited, and the penalty lasts as long as you have Part D. Even if you take no medications today, a cheap plan now is almost always smarter than a permanent penalty later.

How does the $2,100 cap work in 2026?

Once your out-of-pocket spending on covered drugs reaches $2,100 in 2026, you pay nothing more for covered prescriptions the rest of the year. The old coverage gap or donut hole is gone. If your medications are expensive, you can also spread costs across the year with the Medicare Prescription Payment Plan.

Why is the cheapest Part D premium often the wrong plan?

Because premiums are only one of four costs: premium, deductible (up to $615 in 2026), copays per drug tier, and pharmacy pricing. A plan with a $0 premium can put your specific medication on an expensive tier or leave it off the formulary entirely. We price your exact drug list across every plan before recommending one.

Do I need Part D if I have a Medicare Advantage plan?

Usually your Advantage plan includes drug coverage, and in that case you must not enroll in a stand-alone Part D plan; doing so can automatically cancel your Advantage plan. If your Advantage plan lacks drug coverage, or you are on Original Medicare or a Medigap plan, a stand-alone Part D plan is how you avoid the penalty.

Can I change my drug plan every year?

Yes, during the Annual Enrollment Period, October 15 to December 7, and we recommend re-shopping every fall. Formularies and pricing change annually, and last year's winner regularly loses next year. Our clients get this re-check automatically.

Medicare Part D Drug Plans in 2026 | The Medicare Professor

How Part D works in 2026

Part D is optional prescription coverage sold by private carriers under Medicare rules. You pay a monthly premium (the national base average is about $34.50 in 2026), a deductible of up to $615 depending on the plan, and then copays or coinsurance for each prescription. Once your own spending on covered drugs hits $2,100, the plan pays 100 percent of covered medications for the rest of the year.

2026 Part D feature	The number	What it means for you
Maximum deductible	$615	Plans may charge less; many waive it on generic tiers
Out-of-pocket cap	$2,100	Hard yearly ceiling on covered drug spending
Average base premium	About $34.50/mo	Actual premiums vary widely by plan and state
Payment smoothing	$0 to enroll	The Medicare Prescription Payment Plan spreads costs across the year
Late enrollment penalty	1% per month delayed	Permanent surcharge added to your premium

The four questions that pick your plan

Is every one of your drugs on the formulary? A missing medication makes a plan a non-starter no matter the premium.
What tier is each drug on? The same generic can be tier 1 on one plan and tier 3 on another, which changes your copay every single month.
Is your pharmacy preferred? Preferred-pharmacy pricing can cut copays sharply; mail order sometimes beats both.
What is the true yearly total? Premium plus deductible plus 12 months of copays. That number, not the premium, is the plan price.

This is exactly the calculation we run for every client, on every plan we represent, every Annual Enrollment Period. It takes us minutes and routinely saves clients hundreds of dollars a year.

Professor's note

Bring your dosages, not just drug names. A different strength can sit on a different tier, and the plan that wins at 20mg can lose at 40mg. Precision in, savings out.

Part D drug plans: small premiums, big fine print.

How Part D works in 2026

The four questions that pick your plan

Part D questions

Want your exact drug list priced across every plan?