Medicare Part D

Medicare Part D in 2026: The New $2,100 Cap Explained

ZEPHYRHILLS, Fla. — If you take prescription drugs and you're on Medicare, 2026 brings one of the biggest changes to Part D in years. There's a firm limit on what you'll pay out of pocket for covered drugs at the pharmacy, the old "donut hole" is gone, and the program now moves through just three phases instead of four.

Part D in 2026: what's new, and what it means in Zephyrhills

Zephyrhills is in Pasco County, where Part D coverage is offered either as a stand-alone drug plan added to Original Medicare or built into a Medicare Advantage plan. The rules below apply the same way no matter which route you take.

The 2026 numbers you should know

Two figures set the guardrails for Part D this year, according to the Centers for Medicare & Medicaid Services (CMS):

• Maximum deductible: $615. A plan can set its deductible anywhere from $0 up to $615. It can't go higher.
• Out-of-pocket cap: $2,100. Once your out-of-pocket spending on covered drugs hits $2,100 for the year, you pay $0 for covered drugs the rest of the calendar year.

That $2,100 cap is the headline change. Before 2024, there was no annual limit at all on what a person could spend on Part D drugs. The cap was $2,000 in 2025 and now rises slightly with inflation to $2,100 for 2026.

The three phases of Part D coverage

With the coverage gap eliminated as of 2025, Part D now works in three straightforward phases each calendar year:

1. Deductible phase. You pay 100% of the cost of your covered drugs until you meet your plan's deductible (up to $615). If your plan has a $0 deductible, you skip this phase.

2. Initial coverage phase. You pay a copay or coinsurance, and your plan pays the rest. This continues until your out-of-pocket spending reaches the $2,100 cap.

3. Catastrophic phase. Once you hit $2,100 in out-of-pocket costs on covered drugs, you pay nothing more for covered drugs for the remainder of the year.

One important note: only what you pay for covered drugs counts toward the $2,100. Premiums don't count, and drugs your plan doesn't cover don't count either.

The Medicare Prescription Payment Plan

New in 2025 and continuing in 2026, the Medicare Prescription Payment Plan lets you spread your out-of-pocket drug costs across the calendar year in monthly bills instead of paying the full amount at the pharmacy counter.

It doesn't lower your total costs — you still owe the same amount. But it can help if a big bill would hit all at once, like an expensive prescription filled in January. Every Part D plan is required to offer this option. You have to opt in; ask your plan how to sign up.

A word on higher-income surcharges (IRMAA)

If your income is above certain thresholds, you pay an Income-Related Monthly Adjustment Amount (IRMAA) on top of your Part D premium. For 2026, IRMAA begins when a single filer's modified adjusted gross income tops $109,000 (or $218,000 for a couple filing jointly), based on your 2024 tax return.

Most people in Zephyrhills won't owe IRMAA, but if you do, Social Security will notify you by mail.

Dates to circle

• October 15 – December 7: Medicare Annual Enrollment Period. You can join, switch, or drop a Part D plan. Changes take effect January 1.
• January 1 – March 31: Medicare Advantage Open Enrollment Period. If you're already in a Medicare Advantage plan, you can switch to another one or return to Original Medicare (and add a stand-alone Part D plan).

Even if your drugs and pharmacy haven't changed, plan formularies and cost-sharing can change year to year. Reviewing your plan during AEP is one of the most useful hours you'll spend.