Medicare Part D

Waterloo Medicare Part D in 2027: how the $2,400 ceiling actually works

WATERLOO, Iowa — Starting Jan. 1, 2027, no one with Medicare Part D drug coverage will pay more than $2,400 out of pocket for covered prescriptions in a calendar year. It is one of the biggest structural changes to the drug benefit in nearly two decades, and it lands right as the Annual Enrollment Period (Oct. 15 – Dec. 7) runs in Black Hawk County.

If the old "donut hole" ever caught you off guard at the pharmacy counter, this is the year to pay attention. The gap is gone, the math is simpler, and there is a new tool that lets you spread drug costs across the year instead of paying a big bill in January.

What actually changes in 2027

For years, Part D worked in four confusing phases: deductible, initial coverage, the coverage gap, and catastrophic. People with expensive prescriptions could hit thousands of dollars in out-of-pocket costs before catastrophic coverage kicked in.

That is over. As of 2025, Medicare cut the benefit down to three phases — deductible, initial coverage, and catastrophic — and the annual out-of-pocket ceiling is $2,100 in 2026 and $2,400 in 2027. Once your spending on covered drugs reaches that amount, you pay nothing for the rest of the calendar year on drugs your plan covers.

The maximum allowable deductible is $615 in 2026 and $700 in 2027. Individual plans can set a lower deductible or none at all — that varies plan by plan, so read your Annual Notice of Change carefully.

What counts toward the $2,100 (2026; $2,400 in 2027)

Only your true out-of-pocket spending on drugs covered by your Part D plan counts. That includes what you pay at the pharmacy for covered prescriptions and manufacturer discounts that flow through the benefit.

What does NOT count:

• Your monthly Part D premium.
• Drugs your plan does not cover.
• Prescriptions bought outside your plan's network without an approved exception.

This is why it still matters to check whether your specific medications are on your plan's formulary each year.

The Medicare Prescription Payment Plan

Here is the piece a lot of people miss. Even with the cap ($2,100 in 2026, $2,400 in 2027), you could still owe a large sum in a single month — say, if a costly prescription is filled in January and eats up much of your annual limit at once.

The Medicare Prescription Payment Plan (sometimes called "M3P") is a new option that lets you pay $0 at the pharmacy and instead get a monthly bill from your Part D plan, spreading your yearly drug costs across the remaining months of the year. It does not lower what you owe overall, and it does not charge interest or fees. It just smooths the timing.

You have to opt in. You can sign up before the plan year starts or any time during the year. If a single fill would cost you more than $600, your plan is required to let you know the program exists.

The program tends to help most if you have high drug costs early in the year, or predictable high-cost refills. It may not help — and could actually feel worse — if your drug costs are low and steady, because you would trade small pharmacy payments for a monthly bill.

How this connects to your Waterloo choices

Waterloo is in Black Hawk County, where residents choose Part D coverage either as a stand-alone drug plan added to Original Medicare or as part of a Medicare Advantage plan that includes drug coverage. The cap ($2,100 in 2026, $2,400 in 2027) and the payment plan option apply to both.

During the Annual Enrollment Period ending Dec. 7, you can:

• Switch from one Part D plan to another.
• Join, drop, or change a Medicare Advantage plan.
• Move between Original Medicare and Medicare Advantage.

From Jan. 1 through March 31, the Medicare Advantage Open Enrollment Period gives Advantage enrollees one more chance to switch Advantage plans or return to Original Medicare.

A note on higher incomes

If your 2024 income was above $109,000 as a single filer (or $218,000 filing jointly), you will pay an Income-Related Monthly Adjustment Amount (IRMAA) on top of your Part D premium in 2026. IRMAA does not affect the cap ($2,100 in 2026, $2,400 in 2027) — it is a separate premium surcharge tied to your tax return from two years earlier.

Mistakes to avoid this fall

• Assuming the cap means every drug is now cheap. It caps your total, but early-year fills can still be expensive.
• Skipping the Annual Notice of Change your plan mailed you. Formularies, tiers, and pharmacy networks change every year.
• Signing up for the payment plan without doing the math. If your drug costs are low, monthly billing may not help.
• Waiting until Dec. 8 to make changes. After the deadline, options narrow considerably.