The annual Medicare enrollment window opens on Oct. 15, and this year’s renewal carries an unpleasant surprise for millions of American seniors.

Costs are climbing on the supplement side while Medicare Advantage plans trim benefits to manage their own rising expense pressures.

You have until Dec. 7 to review your current plan and switch coverage if the numbers no longer work for your household.

The premiums, copays, and benefit structures you encounter this enrollment season could look noticeably different from what you carried in 2026.

CMS finalized a $13 billion payment bump for Medicare Advantage

The Centers for Medicare and Medicaid Services (CMS) finalized a 2.48% net average payment increase for Medicare Advantage (MA) plans in 2027.

That figure translates to more than $13 billion in additional payments flowing to private insurers that administer MA coverage for 34 million American seniors, CMS confirmed.

Caricature image of CMS logo on the screen

More on Medicare and retirement:

The average monthly MA premium will dip slightly to $12 in 2027, down from $14.37 this year, CMS reported. Stand-alone Part D prescription drug plans will cost enrollees an average of $36 monthly in 2027, up from $35.09 in 2026, the agency noted.

About 80% of current MA enrollees will be able to keep their existing plan at the same premium or lower for 2027, CMS said.

Dan Monahan, a licensed insurance broker with Transition Benefits Health, told Spectrum News 1 that supplement rates are climbing well above recent norms heading into the 2027 cycle.

Caricature image of Dan Monahan

Monahan explained that Advantage plans are compensating for those pressures by reducing certain benefits or shifting more out-of-pocket costs directly onto the enrollee.

The total number of MA plans available nationwide also dipped slightly from 5,553 in 2026 to 5,532 in 2027, CMS reported.

Why 2027 Medicare costs look different from last year

The final 2.48% payment increase landed well above where the process began in January, when CMS proposed a nearly flat 0.09% rate adjustment.

That figure fell short of the 4% to 6% range analysts had expected, triggering immediate pushback from insurers warning about potential benefit cuts, S&P Global Market Intelligence reported.

CMS ultimately reversed course on its proposed risk adjustment model overhaul, which would have further squeezed payments to most MA plans across the country.

The agency will continue using its 2024 risk adjustment model for 2027, giving the MA market more stability during a period of rapid regulatory change.

“Insurers may be bending over backward to try and keep premiums as low as possible.” — Juliette Cubanski, vice president and director of the Program on Medicare Policy, KFF

Caricature portrait of Juliette Cubanski

Cubanski’s observation highlights a core tension that retirees will face as they weigh options during the eight-week enrollment window this fall.

Annual Medicare premiums are projected to climb from roughly $2,440 per enrollee to nearly $5,000 by 2035, a Joint Economic Committee report found. An estimated $450 of that increase stems directly from Medicare Advantage overpayments embedded in the current reimbursement structure, the report noted.

Medicare is projected to absorb a growing share of retirees’ Social Security checks over the next decade, tightening budgets for daily expenses and housing decisions.

Seniors supplementing retirement income through part-time work also face additional complexity when those earnings interact with their existing benefits during the enrollment review process.

Medicare scam warnings surge as enrollment season approaches

The enrollment window also brings a familiar rise in fraud targeting Medicare cardholders, and consumer protection groups are urging seniors to stay alert.

Martin Bailey, an AARP community ambassador, warned that scammers promote plans with dental, vision, and hearing coverage at impossibly low premiums, WRIC reported.

The Better Business Bureau (BBB) has also warned about enrollment-season fraud, with BBB president Janna Kiehl reminding seniors that Medicare will never directly contact them to ask for personal information, KSWO reported.

Monahan flagged a separate active scheme that targets cardholders by telling them they need a high-tech replacement for their existing Medicare card.

The goal of the scam is to extract cardholder Medicare numbers, which can then be used for identity theft and fraudulent billing.

For those reassessing their broader financial positioning after 50, the 2027 enrollment season underscores how much healthcare costs can reshape long-term retirement planning.

Key data points for 2027 Medicare enrollment

  • Enrollment window: Oct. 15 through Dec. 7, for the annual election period, CMS confirmed
  • Average MA monthly premium: $12 in 2027, down from $14.37 in 2026, CMS reported
  • Average Part D monthly premium: $36 in 2027, up from $35.09 in 2026, CMS noted
  • CMS payment increase: 2.48% net average, adding $13 billion in additional MA payments, the CMS Rate Announcement confirmed
  • Total MA plans available: 5,532 in 2027, slightly down from 5,553 in 2026, CMS said
  • Plan access: 97% of Medicare enrollees will have access to 10 or more MA plan options in 2027, CMS reported