When is Medicare Open Enrollment?

Medicare Open Enrollment, also called the Annual Election Period, runs every year from October 15 to December 7. Changes you make take effect on January 1.

What can I change during Medicare Open Enrollment?

You can switch from Original Medicare to a Medicare Advantage Plan, switch back to Original Medicare, change from one Medicare Advantage Plan to another, and join, drop, or switch a Part D prescription drug plan.

Do I need to cancel my old Medicare plan when I switch?

No. Once you enroll in a new plan, your new coverage starts automatically on January 1 and your old plan ends on December 31, so there is no need to call your old insurer to cancel.

What is the Annual Notice of Change (ANOC)?

It is a document your current plan sends in September outlining changes to costs, drug coverage, and provider networks for the coming year. Reviewing it is the best first step before deciding whether to switch plans.

How to Switch Medicare Plans During Open Enrollment

Sep 30, 2026Top Dog Leads LLCMedicare4 min read

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That annual stack of mail from Medicare providers has probably started piling up on your counter again. It's easy to feel overwhelmed by all the fine print, colorful brochures, and jargon. But if there's one time of year to pay attention to your coverage, it's during Medicare Open Enrollment.

Every year from October 15 to December 7, you have a window of opportunity to review your current setup and make changes. Whether your medication costs went up, your favorite doctor left your network, or you're simply looking for a better deal, switching plans might save you a lot of money or a lot of stress in the year ahead.

Here is a straightforward, human guide to navigating Medicare Open Enrollment without losing your mind.

Step 1: Know What You're Actually Allowed to Do

First, let's clear up the confusion about what happens during this specific window (often called the Annual Election Period).

During Open Enrollment, you can:

Switch from Original Medicare (Parts A & B) to a Medicare Advantage Plan (Part C).
Switch from a Medicare Advantage Plan back to Original Medicare.
Change from one Medicare Advantage Plan to a different one.
Join, drop, or switch a Medicare Prescription Drug Plan (Part D).

Note: If you want to drop Medicare Advantage and go back to Original Medicare, there's also a separate Medicare Advantage Open Enrollment Period from Jan 1 – Mar 31, but doing it in the fall ensures your new coverage starts fresh on January 1.

Step 2: Open Your "ANOC" (Annual Notice of Change)

Sometime in September, your current plan sent you a document called the Annual Notice of Change. It isn't junk mail — it's actually the most important piece of mail you'll get all year.

Grab a highlighter and look for three things:

Cost changes: Are premiums, deductibles, or copays going up?
Drug coverage changes: Did your prescription drugs move to a higher "tier," or are they no longer covered?
Network changes: Is your primary care doctor or preferred hospital still in the network for next year?

Plans change their rules every single year. Even if you loved your plan in 2026, it might look very different in 2027.

Step 3: Make a List of Your "Non-Negotiables"

Before you start looking at new options, sit down with a piece of paper and write down what matters most to you right now:

Your current medications: List the exact names and dosages. Drug formularies (the list of covered drugs) vary wildly between plans.
Your must-have doctors and specialists: Write down their names and offices.
Your travel habits: Do you spend winters in a warmer state? If so, standard Medicare Advantage plans with strict local networks might not work well for you.
Your budget: Are you looking for low monthly premiums, or are low out-of-pocket maximums more important to your peace of mind?

Step 4: Compare Options (The Easy Way)

You don't need to call twenty different insurance companies to compare plans. The best place to start is the official tool at Medicare.gov.

Create or log into your Medicare account.
Input your current prescription drugs and preferred pharmacy.
Search for plans in your ZIP code.

The tool will calculate your estimated total annual cost (premium + drug costs) for each plan, ranking them to show you which one saves you the most overall money based on your specific medications.

Step 5: Double-Check the Details Before You Commit

Once you find a plan that looks promising, do a quick sanity check:

Call your doctor's office directly: Don't just rely on the insurance directory online (they are sometimes outdated). Ask the billing department: "Will you accept this specific plan in the upcoming year?"
Check prior authorization requirements: Does the new plan require pre-approval for tests or treatments you know you'll need?
Look at additional benefits: Extra perks like dental, vision, hearing, or gym memberships are nice, but make sure they don't distract you from core coverage like hospital and prescription care.

Step 6: Make the Switch

Once you've picked your plan, enrolling is surprisingly simple:

You can sign up directly through Medicare.gov.
You can call the new plan provider directly.
You can work with a licensed local broker or a SHIP (State Health Insurance Assistance Program) counselor for free, unbiased help.

Important: Once you enroll in your new plan, you do not need to call your old insurance company to cancel. Your new coverage will automatically start on January 1, and your old plan will end on December 31.

Final Thoughts

It's easy to put this off, but sticking with a plan out of habit can cost you hundreds sometimes thousands of dollars a year in unnecessary copays or unexpected out-of network fees. Give yourself an hour or two this fall to sit down, run the numbers, and make sure your health plan is working as hard for you as it should be

For Medicare Agents: Open Enrollment Is When the Phones Ring

Every October, millions of seniors start asking the exact questions covered above. Agents and agencies who want to talk to these beneficiaries while they're actively comparing plans can buy exclusive, verified Medicare leads delivered as live inbound calls — so your time goes to real conversations, not cold lists.