Each September, the Centers for Medicare and Medicaid Services releases a landscape file describing national trends across Medicare Advantage and Part D for the coming plan year: projected enrollment, the average premium change across the country, and how many plan choices exist per county. That document is not the same as the tool an individual enrollee needs to see a specific plan’s premium, deductible, and drug list for a specific ZIP code. CMS’s own guidance for the current open enrollment season states that information for next year’s plans becomes available to the public beginning in October, roughly two weeks before the annual shopping window opens. Reports and marketing material that treat September’s aggregate figures as this year’s shoppable prices are describing the wrong document entirely.
The September Landscape File Reports Averages, Not One Plan’s Bill
CMS has published some version of this landscape summary nearly every year for decades, and its structure has stayed consistent. The document is built for reporters, actuaries, and the plans themselves to track the market: how many Medicare Advantage plans exist nationally, how enrollment is projected to shift, and how the average premium is expected to move from one year to the next across the whole country. None of that arithmetic is calculated at the level of a single plan in a single county, which is what an enrollee actually needs before deciding whether to switch.
The pattern predates this year by a wide margin. CMS’s fact sheet for the 2019 Medicare Advantage and Part D landscape, published in September 2018, was built the same way. It reported that the average Medicare Advantage premium was projected to decline by $1.81 to $28.00, that roughly 83 percent of enrollees would see the same or a lower premium if they stayed in their current plan, and that access to at least one plan would remain near-universal nationwide. None of those figures told an enrollee in a specific county what a specific plan would actually bill in the following year.
A second, narrower kind of 2027 number already exists this year, and it carries the same caveat. On July 28, 2026, CMS set the 2027 national average monthly bid amount for standalone Part D plans at $296.05, a technical figure insurers use inside the formula that sets federal premium subsidies before individual plans finalize their offerings. It is a genuine 2027 figure, released roughly three months before the October consumer update, and it still is not the number any enrollee will see attached to an actual plan they can enroll in.
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CMS Puts the Consumer-Facing Date in October, Not September
The Medicare Open Enrollment partner resources page that CMS maintains for the current season states plainly that information for next year’s plans will be available beginning in October, with the Annual Coordinated Election Period running from October 15 through December 7. That October date covers the tool a retiree actually needs: the government’s plan-comparison lookup, updated with each Medicare Advantage and Part D plan’s premium, deductible, and drug coverage for the coming year, searchable by ZIP code and by the specific drugs a person takes.
CMS has followed roughly the same sequence for years, opening a preview window shortly before October 15 so people can research plan options before the enrollment period formally begins. That gives enrollees about two weeks to compare real, plan-specific numbers before they can act on them by switching or re-enrolling. Nothing in that public tool carries 2027 numbers before the October update, regardless of what industry bid data or landscape averages have already circulated in the weeks before it.
Why September Numbers Get Mistaken for a Shopping Tool
Some of the September confusion is structural rather than accidental. Each Medicare Advantage and Part D plan separately notifies its own current enrollees of the coming year’s changes to premiums, benefits, and drug coverage ahead of the shopping window, a process distinct from the government’s public comparison tool and limited to the plan a person is already enrolled in, not the competing options across the market.
Because no consumer-facing 2027 pricing exists before October, an agent, a mailer, or a phone call claiming to already have this year’s new numbers in September is working from something other than an official source. A retiree weighing whether to switch Medicare Advantage or Part D plans has one place to check a claimed figure against once the shopping window nears: the government’s own updated tool, not a private estimate offered weeks early.
The Comparison Tool, Not a September Number, Sets What a Plan Actually Costs
Medicare’s plan-comparison tool at Medicare.gov and the phone line 1-800-MEDICARE remain the two channels CMS designates for checking an individual plan’s actual 2027 cost once the October update lands. State Health Insurance Assistance Program counselors, funded to give free and unbiased plan comparisons, work from that same updated data and cannot confirm a 2027 premium before CMS turns the tool on.
Acting on a September estimate instead of the October figure carries its own cost. A retiree who assumes a plan’s price has already been set, based on a national average or a bid figure, risks skipping the comparison altogether and staying in a plan that changed for the worse without ever checking the real number against a competitor’s offering.
For now, the only dated commitment on the record is the one CMS itself publishes: publicly available information for next year’s Medicare plans arrives in October, not September, ahead of the October 15 start of open enrollment.
This article was produced with the assistance of AI and reviewed by The Financial Wire editorial team.
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David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
