Tens of millions of Medicare beneficiaries face a projected $27 jump in their annual Part B deductible for 2027, bringing the amount to $310 before outpatient coverage kicks in. The projection, drawn from intermediate assumptions in the 2026 Trustees Report issued on June 9, 2026, follows a 2026 baseline deductible of $283. The final figure will be locked in later this year when the Centers for Medicare and Medicaid Services publishes its official notice for calendar year 2027.
Why a $27 deductible increase hits beneficiaries right now
The gap between $283 and $310 is not abstract. Every dollar added to the Part B deductible is money beneficiaries must pay out of pocket for doctor visits, lab work, and other outpatient services before Medicare shares the cost. A $27 increase represents roughly a 9.5 percent rise in a single year, which lands hardest on enrollees living on fixed incomes who have little room to absorb higher medical costs at the start of each benefit period.
The projection rests on what the Trustees call “intermediate assumptions” about economic growth, health care utilization, and demographic trends. Those assumptions blend expected enrollment growth with per-beneficiary spending forecasts. If actual 2026-2027 enrollment growth or per-beneficiary spending deviates by more than 3 percent from those baseline estimates, the final deductible CMS sets could land at least $10 below the current $310 figure. That scenario is plausible but not guaranteed: enrollment trends and spending patterns can shift quickly when new drugs enter the market or when provider reimbursement rates change.
Trustees Report and CMS-8094 supply the $310 projection
The $310 figure comes from Appendix V.E of the 2026 Trustees Report, which contains intermediate projections for Medicare cost-sharing amounts and premiums. The Office of the Actuary within CMS prepares these estimates each year, and the Board of Trustees, which includes senior federal officials, signs off on the report before publication. The 2026 edition was released on June 9, 2026, making it the most current authoritative source for forward-year Part B cost projections.
Separately, the federal Unified Agenda lists the upcoming rulemaking under identifier CMS-8094, which covers Medicare Part B monthly actuarial rates, premium rates, and the annual deductible beginning January 1, 2027. That entry confirms CMS is expected to issue the notice at the Final Rule Stage, meaning the agency will publish binding rates rather than a draft proposal open for comment. The statutory deadline requires CMS to announce final numbers before the start of open enrollment so beneficiaries and supplemental insurers can plan accordingly.
The Congressional Research Service, in its standing report R40082 on Part B enrollment and premiums, explains the statutory mechanics behind annual deductible adjustments. The deductible is indexed to growth in Part B per-capita spending, a formula Congress established to keep cost-sharing roughly proportional to program costs. That indexing mechanism is why the deductible can jump sharply in years when spending accelerates and stay flat or rise modestly when spending growth slows.
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