Every fall, mailboxes across the Inland Empire fill up with colorful postcards promising the "best" Medicare plan for the coming year. It's overwhelming, and I get calls every October from people who don't know where to start. Here's a clear walkthrough of how to actually switch your Medicare coverage during Open Enrollment.
When Open Enrollment Happens and What It Covers
Medicare's Annual Enrollment Period, often just called Open Enrollment or AEP, runs every year from October 15 through December 7. Any change you make during this window takes effect January 1 of the following year. During this period, you can: switch from Original Medicare to a Medicare Advantage plan, switch from Medicare Advantage back to Original Medicare, move from one Medicare Advantage plan to another, and join, switch, or drop a Part D prescription drug plan. This is the one time each year almost everyone on Medicare has the freedom to make a full switch, so it's worth taking seriously even if you're happy with your current plan.
Step 1: Review Your Current Plan's Annual Notice of Change
Every September, your current Medicare Advantage or Part D plan is required to send you an Annual Notice of Change (ANOC) detailing what's different for the coming year — premiums, deductibles, covered drugs, and network providers. Don't toss this in the junk mail pile. This document tells you exactly what's shifting, and it's often the first sign that it's time to shop around.
Step 2: Check Your Prescription Drug List Against New Formularies
This is the step people skip, and it's the one that costs the most money. Drug formularies change every year — a medication that was low-cost this year might jump to a higher tier, or drop off the list entirely, next year. Before switching anything, compare your prescription list against any new plan's formulary. I do this for clients every year, because a plan that looks cheaper on the surface can end up costing more once you factor in your actual medications.
Step 3: Confirm Your Doctors and Local Hospitals Are In-Network
If you're considering a Medicare Advantage plan, or switching between Advantage plans, verify that your primary care doctor, specialists, and preferred hospitals — whether that's a facility near Chino, Pomona Valley, or elsewhere in the Inland Empire — are actually in-network for next year. Networks shift constantly as carriers renegotiate contracts, and a provider in-network last year isn't guaranteed to stay that way.
Step 4: Compare Total Costs, Not Just the Premium
A $0 premium plan isn't automatically the cheapest option once you add up deductibles, copays, coinsurance, and your out-of-pocket maximum. Look at the whole picture: monthly premium, drug costs, expected doctor visits, and what happens if you need a hospital stay or major procedure. The Part B premium itself is $202.90 a month for most people in 2026, on top of whatever your Advantage or Medigap plan costs — so that baseline is the same no matter which path you choose.
Step 5: Make Your Switch Before December 7
Once you've decided, make the change through Medicare.gov, by calling Medicare, or — often easiest — by working with a licensed broker who can compare plans across carriers at no cost. Your new coverage takes effect January 1. Already in a Medicare Advantage plan and want a second chance after AEP closes? The Medicare Advantage Open Enrollment Period runs January 1 through March 31 for one additional switch, though it's more limited than AEP.
A Word for Medigap Holders
One more thing specific to us here in California: switching your Medicare Advantage or Part D plan during AEP is separate from your Medigap policy. If you have a Medigap plan and just want a better rate, remember California's birthday rule gives you an annual 60-day window (30 days before your birthday through 30 days after) to switch Medigap carriers with equal or lesser benefits, without any health questions — a nice option most other states don't offer.
Don't Guess — Let's Compare Your Options Together
Sorting through dozens of plan changes during a seven-week window is genuinely a lot, even for people who are organized and detail-oriented. I help Inland Empire families do exactly this every fall, comparing real numbers against real doctor and prescription lists so the decision isn't a guess. Call me at (909) 217-2630 or book a free consultation before December 7, and let's make sure your coverage actually fits your life for next year.
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