KFF's New Brief Maps Out What Medicare Actually Costs in 2026

Medicare covers a wide range of medical care, but it was never designed to be free. According to a brief published October 9, 2026 by KFF, a nonpartisan health policy research organization, beneficiaries face a layered set of out-of-pocket costs across traditional Medicare, Medicare Advantage, and Medicare Part D, including monthly premiums, annual deductibles, copays, and coinsurance. The brief, titled "How Much Do People with Medicare Pay for Coverage?," focuses specifically on 2026 figures and lays out how those costs differ depending on which combination of Medicare coverage a person chooses.

This matters right now because Medicare's Fall Open Enrollment Period, officially the Annual Enrollment Period, runs October 15 through December 7, 2026. That is the window when most beneficiaries can switch between Medicare Advantage and traditional Medicare, change Part D drug plans, or move between Medicare Advantage plans. A clear picture of how costs stack up across these paths is exactly what readers need before making a change.

Three Different Cost Structures, Three Different Tradeoffs

Traditional Medicare, which includes Part A for hospital care and Part B for outpatient and physician services, charges a standard monthly Part B premium set annually by the Centers for Medicare & Medicaid Services, along with separate deductibles for each part and 20 percent coinsurance on most Part B services with no out-of-pocket cap unless a beneficiary has supplemental coverage. Medicare Advantage plans, offered by private insurers approved by CMS, often advertise low or $0 monthly premiums but use their own copay and coinsurance structures, and they are required to cap total annual out-of-pocket spending for Medicare-covered services, which traditional Medicare alone does not do. Medicare Part D, the standalone prescription drug benefit, carries its own premium, deductible, and cost-sharing tiers that vary by plan and by the specific drugs a beneficiary takes.

The KFF brief's value is in showing how these three systems interact rather than existing in isolation. A beneficiary's total annual spending depends on the combination they choose: traditional Medicare alone, traditional Medicare plus a Part D plan and a Medigap supplement, or a Medicare Advantage plan that may bundle drug coverage. Someone comparing options on paper can easily underestimate costs by looking at only one premium number and ignoring deductibles, specialist copays, or drug tier pricing.

Key Takeaway

The Medicare Annual Enrollment Period runs October 15 through December 7, 2026. Any plan switch made during this window takes effect January 1, 2027, so this is the time to compare total costs, not just advertised premiums, before committing to a plan for the coming year.

Why Premiums Alone Don't Tell the Full Story

A low headline premium is not the same as low total spending. Medicare Advantage plans frequently market $0 premiums, but out-of-pocket costs can still accumulate through copays for specialist visits, hospital stays, or durable medical equipment, up to the plan's annual out-of-pocket maximum. Traditional Medicare has no such cap on Part B coinsurance unless a beneficiary buys a Medigap policy, which carries its own monthly premium. Part D plans add another variable: a drug plan with a low premium can still cost more overall if a beneficiary's prescriptions fall into a higher cost-sharing tier or if the plan's formulary does not cover a needed medication at a lower tier.

This is the gap KFF's analysis is designed to close, by laying out 2026 cost figures across all three coverage paths so readers can see the fuller financial picture rather than comparing premiums in isolation. For Senior Plan Path readers, the practical lesson is to request a plan's full summary of benefits, not just its premium sheet, before enrolling or renewing.

What to Watch and Do Next

Three steps are worth taking before December 7, 2026. First, pull your current plan's Annual Notice of Change, which every Medicare Advantage and Part D plan is required to send each fall, and compare it against your actual prescriptions and expected medical visits for the coming year. Second, if you take regular medications, check whether your drugs are on a plan's formulary and which cost-sharing tier they fall into, since tier placement can shift year to year even if the plan premium stays flat. Third, if you are weighing traditional Medicare against Medicare Advantage, factor in whether you would need a Medigap policy and what that premium would add to your total, since Medigap underwriting rules can make it harder or more expensive to switch later outside specific enrollment windows.

None of this replaces a conversation with a licensed insurance agent or a session with your State Health Insurance Assistance Program, both of which can walk through your specific drug list and provider network against plan options available in your ZIP code. KFF's brief is a useful national-level reference for understanding how Medicare's cost structure works in 2026, but actual dollar amounts vary by plan, location, and individual health needs. Readers can review the full brief directly from KFF's October 2026 report for the detailed cost breakdowns referenced here.