Medicare Part D

Does your drug coverage ride alone or come bundled?

URBANDALE, Iowa — If you take even one prescription, Medicare gives you two very different ways to pay for it. You can pair Original Medicare with a stand-alone Part D drug plan, or you can pick a Medicare Advantage plan that bundles drug coverage inside it. Both lead to drug coverage in 2027, but the plumbing behind them is not the same — and moving from one path to the other changes more than just your pharmacy card.

The two structures, side by side

A stand-alone Part D plan (often called a PDP) is a drug-only policy. You keep Original Medicare — Part A for hospital, Part B for doctor visits — and the PDP sits next to it to handle prescriptions. Many people on this path also buy a Medigap (Medicare Supplement) policy to help with Part A and Part B cost sharing.

A Medicare Advantage plan with drug coverage (an MA-PD) is a single plan from a private insurer that replaces how you get your Part A, Part B and Part D benefits. Medical care and prescriptions share one card, one insurer and often one deductible structure.

So the first question is not "which plan is better." It is "which structure do I want to live inside?"

What stays the same in 2027

The Part D rulebook is set by Medicare, so some things are identical no matter which path you pick:

• The Part D out-of-pocket cap on covered drugs is $2,100 in 2026 and $2,400 in 2027. Once you hit it, you pay nothing for the rest of the year on covered prescriptions.
• The maximum Part D deductible a plan can charge is $615 in 2026 and $700 in 2027 (plans can set it lower).
• The old "donut hole" coverage gap was eliminated starting in 2025. Part D now has three phases: deductible, initial coverage, and catastrophic.
• The Medicare Prescription Payment Plan is available on both paths. It lets you spread your drug costs across the calendar year in monthly installments instead of paying big bills at the pharmacy.
• Higher-income enrollees pay an IRMAA surcharge on Part D. For 2026, IRMAA begins above $109,000 for a single filer.

In other words, the cap, the deductible ceiling, and the smoothing option travel with you.

What changes when you move between them

This is where many Urbandale readers get surprised. Switching your drug coverage usually drags other pieces of your coverage along for the ride.

Moving from stand-alone Part D to a Medicare Advantage plan: You are not just changing your pharmacy benefit. You are also changing how your medical care is delivered — networks of doctors and hospitals, prior authorization rules, and whether you need referrals. If you had a Medigap policy, it will no longer pay secondary to Original Medicare the way it did, because you are now using an Advantage plan instead.

Moving from Medicare Advantage back to Original Medicare + a stand-alone Part D: You regain the ability to see any provider nationwide who accepts Medicare. But if you want a Medigap policy to go with it, you may be medically underwritten in Iowa outside of certain guaranteed-issue windows, which means an insurer can look at your health history before deciding whether to sell you one. That is the single biggest "gotcha" people miss.

Formularies reset. Each plan — PDP or MA-PD — has its own drug list, its own tiers, and its own preferred pharmacies. A medication that was on a low tier in your old plan may land on a higher tier in the new one, or require a step-therapy or prior-authorization step.

When you can actually switch

Two windows matter most:

• Annual Enrollment Period: October 15 – December 7. Open to everyone with Medicare. You can move between Original Medicare + PDP and Medicare Advantage, change PDPs, or change MA plans. Changes take effect January 1.
• Medicare Advantage Open Enrollment: January 1 – March 31. If you are already in an Advantage plan, you can switch to a different Advantage plan or drop back to Original Medicare (and pick up a stand-alone Part D plan). You cannot use this window to move from Original Medicare into Advantage.

Special Enrollment Periods also exist for life events — moving, losing other coverage, qualifying for Extra Help, and more.

The Urbandale picture

Urbandale is in Polk County, where both stand-alone Part D plans and Medicare Advantage plans that include drug coverage are offered for 2026. The exact counts, carriers and plan names are listed on medicare.gov's Plan Finder, which you can filter by ZIP code. Availability is set at the county level, so a neighbor on the other side of the Polk–Dallas county line may see a different list than you do.

If you are weighing the two paths, the practical test is less about plan counts and more about three personal questions: Which doctors do you want to keep? Which prescriptions are you on, and how are they covered under each plan's formulary? And do you want (or already have) a Medigap policy?

Where to get unbiased help

• medicare.gov — Plan Finder shows every PDP and MA-PD available at your Urbandale ZIP code and lets you enter your drug list.
• 1-800-MEDICARE (TTY 1-877-486-2048), 24/7.
• Iowa SHIIP (the State Health Insurance Assistance Program) offers free, one-on-one Medicare counseling to Iowans. SHIP counselors do not sell insurance.