Part D Drug Plan Premiums to Jump in 2027 for Some

Most Part D Enrollees Face Small Increases, But Not All

Monthly premiums for Medicare Part D stand-alone prescription drug plans (PDPs) will rise modestly for most enrollees in 2027, but people who stay in certain current plans without comparing options could see increases of $50 a month or more, according to a brief published October 2, 2026, by KFF, a nonprofit health policy research organization. A Part D PDP is a stand-alone drug plan that people with Original Medicare buy separately to cover prescription costs, as opposed to drug coverage bundled into a Medicare Advantage plan.

KFF's analysis also found a modest reduction in the overall number of stand-alone PDPs available for 2027. The brief does not name every plan affected, but it draws a clear line: enrollees who take no action during the upcoming enrollment period are the ones most exposed to the largest premium jumps. The report arrives less than two weeks before the Medicare Annual Enrollment Period, also called Open Enrollment, which runs October 15 through December 7, 2026, for coverage that takes effect January 1, 2027.

Why Premium Changes Vary So Widely Between Plans

Part D premiums are set plan by plan, not as a single national rate, because each insurer prices its own formulary, drug tiers, and projected claims costs. That structure is why two people on the same medications can see very different renewal notices: one plan's insurer may hold pricing steady or offer a modest adjustment, while another raises premiums sharply to cover rising drug costs or to offset enrollment losses elsewhere in its book of business.

This pattern has become more pronounced since the 2025 Part D redesign under the Inflation Reduction Act, which capped annual out-of-pocket drug costs at $2,000 and shifted more of the cost burden for expensive claims onto insurers and manufacturers. Since that change took effect, insurers have adjusted premiums and plan offerings from year to year as they recalibrate to the new cost structure. KFF's finding of a modest reduction in the number of 2027 PDPs fits that broader trend of insurers consolidating or exiting plans that no longer fit their pricing models.

The Enrollees Most Likely to See Large Increases

The people most exposed to steep premium jumps are typically those who have stayed in the same plan for several years without checking whether a cheaper, comparable option exists. Medicare's default is auto-renewal: if you take no action, you keep your current plan into 2027, even if the premium rises substantially. KFF's brief underscores that this default can be costly for enrollees whose plan's premium is increasing well above the modest, sub-$10 range seen elsewhere in the market.

What Medicare Plan Path Readers Should Do Before December 7

If you have a stand-alone Part D plan, watch for your insurer's Annual Notice of Change (ANOC), which should arrive by late September each year and spells out your plan's 2027 premium, deductible, and formulary changes. Compare that notice against other plans available in your area using Medicare's Plan Finder tool at Medicare.gov, entering your current prescriptions to see accurate, drug-specific cost estimates rather than relying on premium alone.

A few practical steps can limit your exposure to the kind of large increase KFF describes:

• Reread your ANOC closely for any premium change, not just a general percentage, since KFF's analysis shows the range runs from under $10 to $50 or more per month depending on the plan.
• Run your specific medications through the Medicare Plan Finder tool to compare total annual cost, including premiums, deductibles, and copays, not premium alone.
• Check whether a Medicare Advantage plan with drug coverage in your area offers a lower total cost for the same medications, since switching between stand-alone PDPs and Advantage plans is also allowed during Open Enrollment.
• Make any plan change by December 7, 2026, since the new plan selection takes effect January 1, 2027, and changes cannot be made retroactively.

Because plan pricing and formularies change every year, comparing options annually, even if you were satisfied with your plan in 2026, is the most reliable way to avoid an unexpected premium increase. If the comparison process feels overwhelming, a licensed Medicare agent can walk through your specific medications and local plan options with you before the December 7 deadline.

Read the full analysis from KFF's October 2, 2026 brief on the 2027 Part D stand-alone plan market.