KFF Brief Breaks Down What Medicare Actually Costs in 2026

Medicare beneficiaries face a range of out-of-pocket costs in 2026, from monthly premiums to deductibles and coinsurance, according to a brief published October 9, 2026 by KFF (Kaiser Family Foundation), a nonprofit health policy research and journalism organization. The KFF brief lays out, side by side, what people pay under Original Medicare, Medicare Advantage, and Medicare Part D drug plans, giving beneficiaries a baseline for comparing coverage during this year's Medicare Open Enrollment period, which runs from October 15 through December 7, 2026.

The brief does not announce new costs; it compiles and explains the premiums, deductibles, and cost sharing rules that the Centers for Medicare and Medicaid Services (CMS) already set for 2026 across every part of the program. For Medicare Plan Path readers, the value is less in any single number and more in seeing how the pieces fit together, because a plan's monthly premium is only one part of what a beneficiary actually spends over a year.

Four Cost Categories Beneficiaries Need to Track

Original Medicare (Parts A and B) charges a monthly Part B premium that CMS set at $202.90 for most enrollees in 2026, plus an annual Part B deductible, after which beneficiaries typically pay 20 percent coinsurance for most outpatient services with no annual cap. Part A, which covers hospital stays, has no premium for most people who paid Medicare payroll taxes for at least 10 years, but it carries a per benefit period deductible and daily coinsurance for longer hospital or skilled nursing stays.

Medicare Advantage plans, the private insurer alternative to Original Medicare, often advertise low or $0 premiums, but KFF's brief notes that beneficiaries still face copays, coinsurance, and plan specific annual out of pocket maximums that vary significantly by insurer and county. Medicare Part D, the standalone prescription drug benefit, adds its own deductible, copay tiers, and a catastrophic coverage phase that caps annual out of pocket drug spending under rules that took effect in 2025 and continue into 2026.

Higher income beneficiaries also pay more across the board through the Income Related Monthly Adjustment Amount (IRMAA), a surcharge CMS adds to Part B and Part D premiums for enrollees whose income exceeds set thresholds based on tax returns filed two years earlier. Someone who had a high income year in 2024 could see a 2026 premium surcharge even if their income has since dropped, a timing mismatch that catches many retirees off guard.

Key Takeaway

The sticker price on a Medicare Advantage or Part D plan rarely tells the whole story. KFF's 2026 breakdown is a reminder to add up premiums, deductibles, copays, and IRMAA surcharges together, not just compare monthly premiums, before choosing coverage during Open Enrollment, which ends December 7, 2026.

What This Means for Open Enrollment Decisions

This brief lands in the middle of the 2026 Medicare Open Enrollment period, making it a useful checklist rather than just background reading. Beneficiaries comparing Medicare Advantage and Medigap, or weighing whether to switch Part D plans, should treat each cost category in the KFF brief as a question to ask about any plan under consideration. What is the premium? What is the deductible? What does the plan charge for the specific drugs and services I use? Is there an annual out of pocket maximum, and what is it?

Medicare Advantage out of pocket maximums matter especially for anyone managing a chronic condition or anticipating a hospital stay, since that cap, not the premium, often determines total annual spending in a difficult health year. Medigap (Medicare Supplement) policies work differently, charging a higher flat premium in exchange for covering most of Original Medicare's cost sharing, which can mean more predictable bills but less flexibility to switch plans year to year because of medical underwriting outside specific enrollment windows.

Before December 7, 2026, Medicare Plan Path readers should pull their current Explanation of Benefits or Part D claims history to see which drugs and services they actually used this year, then compare that usage against next year's plan costs rather than relying on last year's premium alone. Anyone near an IRMAA income threshold should also check whether a life changing event, such as retirement or a reduced income, qualifies them to request a reconsideration of their surcharge through the Social Security Administration. Because plan costs and formularies change annually and vary by state and county, comparing options through Medicare's Plan Finder tool or with a licensed insurance agent remains the most reliable way to estimate actual 2026 costs for an individual situation.