Medicare Part D

$2,100 Part D Cap Arrives for Rolla Medicare Members

# How Medicare Part D Works in 2027: The Deductible, the Cap, and the Three…

ROLLA, Mo. — If you take prescription drugs and you're on Medicare, 2027 brings another year of the lower out-of-pocket cap that reshaped Part D, with the cap stepping up from $2,100 in 2026 to $2,400 in 2027. The old "donut hole" is gone, and there's a way to spread your drug costs across the year instead of paying big bills all at once.

Here's a plain-English walk-through of how Medicare Part D will work in 2027, and what Rolla-area readers should keep in mind before the Annual Enrollment Period ends on December 7, 2026.

The headline number: a $2,100 out-of-pocket cap

For 2027, Medicare has set the Part D out-of-pocket cap at $2,400 (up from $2,100 in 2026). Once your out-of-pocket spending on covered prescription drugs hits that amount in the calendar year, you pay $0 for your covered drugs for the rest of the year.

This cap applies whether you get your Part D coverage through a standalone prescription drug plan or as part of a Medicare Advantage plan that includes drug coverage. It's a program-wide rule set by the Centers for Medicare & Medicaid Services (CMS), not a plan-specific perk.

The cap is a big deal for anyone who takes expensive brand-name or specialty medications. In prior years, people with high drug costs could spend many thousands of dollars before catastrophic protection kicked in. In 2027, once you reach $2,400, you're done for the year.

The deductible: up to $700 in 2027

Before your plan starts sharing costs, you may have to meet a deductible. For 2027, the maximum Part D deductible is $700 (it was $615 in 2026). Individual plans can charge less than that — some charge no deductible at all — but no Part D plan is allowed to charge more.

During the deductible phase, you pay the full negotiated price of your covered drugs until you hit that dollar amount. If your plan has a $0 deductible, you skip this phase entirely and move straight into the next one.

The three phases of Part D coverage

As of 2025, the old "coverage gap" (often called the donut hole) is gone. That leaves three phases in 2027:

1. Deductible phase. You pay the full cost of your covered drugs until you meet your plan's deductible (up to $700 in 2027). 2. Initial coverage phase. After the deductible, you pay a copay or coinsurance for each prescription, and your plan pays the rest. You stay here until your total out-of-pocket spending reaches $2,400. 3. Catastrophic phase. Once you've spent $2,400 out of pocket on covered drugs, you pay $0 for the rest of the calendar year for your covered prescriptions.

That's it. No more confusing middle phase where costs suddenly jumped.

The Medicare Prescription Payment Plan: smoothing out the bills

Even with a $2,400 cap, hitting that number in January or February can sting. That's why CMS created the Medicare Prescription Payment Plan — sometimes called "M3P" or drug cost smoothing.

Here's how it works: instead of paying your pharmacy directly when you pick up a prescription, you can opt in and have your Part D drug costs billed to you in monthly installments spread across the rest of the plan year. You don't pay more overall — you just spread it out.

This is optional. It doesn't lower your drug prices, and it doesn't change your cap. But for someone facing a big bill at the pharmacy counter in January, it can turn a $1,500 charge into more manageable monthly payments. You can sign up through your Part D plan.

What Rolla readers should know locally

Rolla is in Phelps County, and Medicare plan availability is set at the county level. That means the number of standalone Part D plans and Medicare Advantage plans with drug coverage offered in Rolla is the same as elsewhere in Phelps County. When you compare options at Medicare.gov, entering your ZIP code will pull up the plans available in your county.

The rules above — the $700 deductible ceiling, the $2,400 cap, the three phases, the payment plan option — apply to every Part D plan nationwide in 2027, including plans sold in Phelps County. The 2027 plan lineup for your area is detailed in each plan's Annual Notice of Change and on Medicare.gov's Plan Finder.

A quick note on IRMAA

If you're a higher-income beneficiary, you may pay an extra amount on top of your Part D premium called IRMAA (Income-Related Monthly Adjustment Amount). For 2026, IRMAA surcharges begin for single filers with income above $109,000 (and correspondingly higher thresholds for married filers). Social Security uses your tax return from two years earlier to decide whether IRMAA applies.

Key deadlines to circle

• Annual Enrollment Period (AEP): October 15 – December 7, 2026. This is when you can join, switch, or drop a Part D or Medicare Advantage plan for 2027.
• Medicare Advantage Open Enrollment: January 1 – March 31. If you're already in a Medicare Advantage plan, you get one chance in this window to switch to another MA plan or return to Original Medicare (with a standalone Part D plan).

Missing AEP usually means waiting a full year to change your drug coverage, unless you qualify for a Special Enrollment Period.