Ask most people when Medicare's Annual Enrollment Period starts, and they'll say October 15. That's true, but it's also only part of the story. October 15 is enrollment day, the day you're allowed to make changes. It is not the day the real information becomes available, and treating it like the starting line instead of the deadline is exactly how people end up rushing decisions they didn't have to rush.
Here's the actual timeline, laid out clearly.
Mid-to-Late September: The Real Numbers Show Up
Every year, CMS releases what's known as the plan "landscape" in mid-to-late September. This is the first real look at the coming year's Medicare costs and program details, weeks before enrollment even opens.
This year, that release matters more than usual. A federal support program that had been helping keep standalone Part D drug plan premiums more stable is ending, meaning this landscape release reflects pricing set without that extra support for the first time in a couple of years. It's a meaningful shift, and it's exactly why this September's numbers are worth an early look.
A few program-level numbers already confirmed for the coming year: the Part D out-of-pocket cap is rising to $2,400, up from $2,100. The Part D deductible is climbing to $700. The base Part D premium has been set at $41.33. None of these numbers tell you exactly what your specific plan will cost, but they set the stage for what's coming.
October 15 Through December 7: The Actual Enrollment Window
This is the period most people think of as "Medicare season." It's when you can actually make changes, switch plans, adjust coverage, and enroll in something new. But if you've waited until this window opens to start paying attention, you're already working with less time than you think.
The smarter approach: use the September landscape release to start comparing options, and use the October 15 to December 7 window to actually execute the decision you've already thought through.
What to Actually Do With This Timeline
The single most useful thing you can do before the rush starts is review your current coverage now, before the new numbers even come out. What are you currently paying? What's working? What would you change if you had the option? Knowing the answers to these questions ahead of time means you're ready to compare intelligently once the new information is available, instead of trying to evaluate everything from scratch during a five-week window.
Medicare doesn't have to be confusing. It just requires knowing the actual sequence of events instead of the version most people assume is true.
If you want help walking through your specific situation before the season gets busy, that conversation is always worth having early.
