Most of the Medicare mistakes I see in Carson City, Reno, and the Carson Valley aren't about picking the wrong plan — they're about picking the right plan at the wrong time, or missing the window to fix a plan that stopped working. Medicare doesn't run on one open enrollment period like a job's benefits do. It runs on several, each with a different name, a different calendar, and a different set of things you're allowed to change. Here's what each one actually means for you.
The five windows, side by side
| Window | Dates | What you can do |
|---|---|---|
| Initial Enrollment (IEP) | 7 months around your 65th birthday | First-time enrollment in Original Medicare, Part D, Medicare Advantage, or a Medigap plan. |
| Medigap Open Enrollment | One-time 6 months, starting the month you're 65+ and enrolled in Part B | Buy any Medigap plan sold in Nevada with no medical underwriting — the best time to lock one in. |
| Annual Enrollment (AEP) | October 15 – December 7, every year | Switch Medicare Advantage plans, switch Part D plans, or move between Original Medicare and Advantage. Changes start January 1. |
| MA Open Enrollment (OEP) | January 1 – March 31 | One extra switch if you're already in a Medicare Advantage plan — to a different Advantage plan or back to Original Medicare. |
| Special Enrollment (SEP) | Triggered by a life event, any time of year | Moving, losing employer or Medicaid coverage, a plan losing its contract, or qualifying for a 5-star plan. |
Why AEP deserves your attention every single year
It's tempting to assume that if you're happy with your plan, AEP doesn't apply to you. In practice, it's the one window worth using every fall — even for a "just checking" review — for two reasons specific to Nevada.
First, networks and formularies change annually, and insurers mail an Annual Notice of Change (ANOC) letter every September that almost nobody reads closely. A plan that covered your doctors this year isn't guaranteed to cover them the same way next year — and in rural counties like Lyon and Churchill, where plan options are already thinner, a small network shift can mean a much longer drive for care.
Second, carriers periodically adjust which Nevada counties they serve. If your Advantage plan pulls out of your county for the next plan year, AEP (or the SEP that follows a plan's exit) is how you land somewhere that still works — see my Medicare Advantage vs. Medicare Supplement guide for how the two paths hold up differently against that kind of network risk.
And it's worth saying plainly: if you do nothing during AEP, you're not protected — you're just automatically re-enrolled in whatever your current plan becomes next year, changes included. Doing nothing is a valid choice if you've actually checked and it still fits. It's a costly one if you've just assumed.
A five-minute AEP checklist
- Open the ANOC letter. It arrives every September and lists exactly what's changing in your plan for next year — premium, network, and formulary.
- Recheck your doctors and hospital. A network that worked this year can shift by next January — see how coverage plays out in Reno, Carson City, and the rest of the service areas I work in.
- Recheck your prescriptions. Formularies and drug tiers change yearly, often more than the headline premium does.
- Compare total cost, not just premium. A lower monthly payment can still add up to more once copays and deductibles are counted.
- Get a second set of eyes before December 7. A quick annual review through my Medicare services catches most of this in one sitting.
If you're moving, retiring, or turning 65
Life events open their own windows outside AEP. Turning 65 gives you the 7-month Initial Enrollment Period, plus a separate one-time 6-month Medigap open enrollment that starts the moment you're 65 and on Part B — worth locking in early since Medigap plans can require medical underwriting once that window closes. Retiring and losing employer coverage, or moving your primary residence between a Lake Tahoe address and a valley address, can each trigger a Special Enrollment Period. If any of that applies to you, don't assume you're stuck waiting for October — a short conversation can confirm what window you're actually in.
One more Nevada-specific wrinkle worth knowing: if your Advantage plan earns a 5-star rating from Medicare for the upcoming year, there's a separate 5-star Special Enrollment Period, open December 8 through November 30, that lets you switch into that plan once, outside the normal calendar. Five-star plans are uncommon and availability varies by county, but it's a detail worth checking during an annual review rather than assuming it doesn't apply to you.
If that sounds like your speed, start with my Medicare services page, read more about how I work, or browse the rest of the blog for more plain-English breakdowns.