Medicare Guide

Medicare Advantage open enrollment period: rules and local help

The Medicare Advantage open enrollment period runs January 1 to March 31 each year (Medicare.gov). If you're already in a Medicare Advantage plan, you can switch to another Advantage plan or drop your plan, go back to Original Medicare and add a Part D drug plan. You can't use it to move from Original Medicare into Advantage (Medicare.gov).

Reviewed by John Schenk, Licensed Insurance Agent since 2008 · Published October 30, 2026 · Last updated October 30, 2026

Quick answer

Medicare starts with Parts A and B. Your real decision is how you want the rest of your coverage to work.

Most people compare Original Medicare with add-ons against Medicare Advantage. The right path depends on local plan availability, doctors, prescriptions, budget, travel, and timing.

Key takeaways

The window is January 1 to March 31, and it's only for people already in a Medicare Advantage plan (Medicare.gov).
You get one change during this window, so pick carefully (Medicare.gov).
A new plan starts the first day of the month after it gets your request (Medicare.gov).
It's a second chance after fall Open Enrollment (October 15 to December 7), not a replacement for it (Medicare.gov).
Leaving Advantage doesn't always mean you can buy a Medigap policy, so check that before you drop your plan (Medicare.gov).
A licensed local agent can test your doctors and prescriptions against plans in your county before you use your one change.
The Medicare Advantage Open Enrollment Period runs January 1 to March 31 each year (Medicare.gov).
Fall Open Enrollment runs October 15 to December 7 each year (Medicare.gov).
Only one plan change is allowed during the January to March window (Medicare.gov).
Coverage begins the first day of the month after the plan receives your request (Medicare.gov).

What this means in plain English

A Medicare Advantage plan is a Medicare-approved plan from a private company that covers your Part A and Part B benefits, and most include drug coverage (Medicare & You). This January window is for fixing a fall choice that isn't working. Maybe your doctor left the network, or a refill cost more than you expected. If you joined Advantage when you first got Medicare, you also get one change within your first three months of having Medicare (Medicare.gov). For example, say your heart doctor leaves your Advantage plan's network in January. In February, you could switch to another Advantage plan that has that doctor in its network, and the new plan would start March 1. Or you could go back to Original Medicare and join a Part D plan in the same window. Either move uses your one change. So if a pharmacy problem shows up in May, you'd generally wait until fall unless you qualify for a Special Enrollment Period (Medicare.gov).

Why choose the Medicare Advantage open enrollment period

Use it when a real problem shows up, not because a mailer told you to switch. The tradeoff is simple. You get one change, so a rushed pick can leave you in a plan that fits worse until fall, unless you qualify for a Special Enrollment Period (Medicare.gov). Going back to Original Medicare gives you any doctor who takes Medicare. But you may face health questions when you apply for a Supplement (Medicare.gov). Here's how your two main options compare. If you switch to another Advantage plan, you stay with a private plan that covers your Part A and Part B benefits, and most of these plans include drug coverage. Many use a provider network, so you'll want to confirm your doctors are in the new plan's network (Medicare & You). If you go back to Original Medicare, you can see any doctor in the U.S. Who takes Medicare. But you'll need a separate Part D plan for drug coverage (Medicare & You). You may also want a Medigap policy to help pay costs Original Medicare doesn't cover (Medicare.gov).

How the Medicare Advantage open enrollment period works

First, write down every prescription with its dose, along with the doctors and pharmacies you want to keep. Next, compare plans sold in your county, since availability varies by location. A plan a friend has in Phoenix might not be offered where you live. Then enroll in the new plan, or return to Original Medicare and join a Part D plan in the same window if you want drug coverage. Coverage starts the first of the month after the plan gets your request (Medicare.gov). So a request on February 10 means coverage starts March 1.

Get started today

The Medicare Store's licensed agents work from offices in six cities. In Nevada, that's Las Vegas and Reno. There's Phoenix in Arizona and Albuquerque in New Mexico. In South Texas, agents work from McAllen and Laredo. They also help by phone in all 50 states and DC, in English or Spanish. The help is free. An agent checks your doctors and drugs against plans from several carriers before you decide. After you enroll, your agent checks in six times the first year, twice a year after that, and reviews your coverage every fall.

What to do next

You now know the dates, the one-change limit and the Medigap risk of leaving Advantage. If your current plan has a problem, write down your doctors and prescriptions today. Then call or text 888-333-5853, or schedule a free meeting at themedicarestore.com. An agent will compare plans in your area, since availability varies by location, and handle the enrollment if you decide to switch. This page is informational only. Talk with a licensed Medicare agent about your situation before you make a change.

Common questions

Questions people usually ask next

These answers are a starting point. Medicare details can change based on timing, other coverage, and where you live.

Can I join Medicare Advantage from Original Medicare between January and March?

No. The January 1 to March 31 window only covers people already in an Advantage plan (Medicare.gov). You'd need fall Open Enrollment or a Special Enrollment Period.

How many changes can I make?

You can make one change during the Medicare Advantage open enrollment period (Medicare.gov). After that, you generally wait for fall Open Enrollment unless you qualify for a Special Enrollment Period.

Can I buy a Medigap policy if I leave my Advantage plan?

Maybe. It depends on your state and whether you have a guaranteed issue right (Medicare.gov). Otherwise, an insurer may review your health first, so confirm approval before dropping Advantage.

Does it cost anything to get help from The Medicare Store?

No. Consultations with a licensed agent at The Medicare Store are free, whether you meet by phone, by text, in an office or at home.

Official references

Sources checked for this guide

These guides are written in plain English, but the 2026 cost figures and coverage rules should stay tied to official Medicare and CMS source material.

Medicare.gov Medicare.gov Medicare & You themedicarestore.com

About the reviewer

John Schenk · Licensed Insurance Agent since 2008 · Nevada license #603197

John Schenk is a trainer and Agent Relationship Manager for The Medicare Store. He has been a licensed insurance agent since 2008 (Nevada license #603197). He trains and supports agents who sit with Medicare Store clients every day.

Need help applying this?

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Medicare decisions depend on your doctors, prescriptions, location, timing, and budget. We can help you compare the options that fit your situation.

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