When Is Medicare Annual Enrollment? Dates to Know

A fall calendar, green folder, reading glasses, and coffee arranged for a Medicare plan review

Medicare annual enrollment runs every year from October 15 through December 7. Medicare calls it Open Enrollment. You may also hear it called the Annual Enrollment Period or AEP. It is the fall window when people with Medicare can review their health and drug coverage, then make changes for the following year.

For 2026, the window opens on October 15, 2026, and ends on December 7, 2026. A health or drug plan must receive an enrollment request by December 7. If you make an allowed change during that period, the new coverage generally begins January 1, 2027.

The dates are simple. The decision is not always simple. A person may be happy with their current plan, while another has a doctor leaving the network, a prescription moving to a different tier, or a premium that no longer fits the budget. The goal of annual enrollment is not to change coverage just because the calendar says so. It is to make sure next year's version of your coverage still fits your real life.

This guide explains what Medicare annual enrollment allows, what it does not allow, the other dates people commonly confuse with it, and how to review a plan without getting buried in mail. If you are wondering whether you even need to act, start with D M Cook Insurance’s guide to Medicare renewal. Most plans renew automatically, but automatic renewal is not the same as a yearly review.

The Short Answer: October 15 Through December 7

The annual Medicare Open Enrollment Period is October 15 through December 7 each year. Medicare.gov confirms the dates and the January 1 effective date for changes made during the window. The deadline is firm, so waiting until the final evening leaves little room to compare options, ask questions, or correct an enrollment problem.

The fall window is mainly about Medicare Advantage and prescription drug coverage. It gives people with Medicare a regular chance to look again at private health and drug plans offered in their area. It also gives people in Original Medicare a chance to add, change, or drop a stand-alone Part D drug plan.

You do not need to submit a new Medicare application every fall just to keep Original Medicare. You also do not have to change a Medicare Advantage or Part D plan if the plan still works for you. But plans can change from one year to the next, which is why Medicare encourages people to compare their coverage before the deadline.

Hands sorting plan mail beside a desk calendar, coffee, and a notepad

What You Can Do During Medicare Annual Enrollment

During the October 15 through December 7 window, you can make several kinds of changes. Medicare’s plan enrollment guidance lists the main options: join, switch, or drop a Medicare Advantage plan; move from Original Medicare to Medicare Advantage; move from Medicare Advantage back to Original Medicare; and join, switch, or drop a Part D drug plan if you have Original Medicare.

Those choices have consequences beyond a monthly premium. Moving from Medicare Advantage to Original Medicare, for example, may mean deciding whether you want Part D drug coverage and whether a Medicare Supplement policy is available to you. Switching from one Medicare Advantage plan to another means looking at the doctors, hospitals, prescription coverage, pharmacy options, copays, maximum out-of-pocket amount, and benefits of the actual plan, not just a television commercial or a headline offer.

If Medicare Advantage is the coverage you are reviewing, compare the network and cost details with the help of the site’s Medicare Advantage guidance and Georgia Medicare Advantage plan guide. They explain the questions that matter when a plan looks attractive at first glance but needs to work with your everyday care.

What Annual Enrollment Does Not Do

Fall Open Enrollment is not a universal do-over for every Medicare decision. It does not replace your personal Initial Enrollment Period around age 65. It does not automatically create a new six-month Medigap Open Enrollment Period. It also does not give every person the same options after a move, a retirement, or a loss of other coverage. Those situations can involve a Special Enrollment Period with its own rules and deadlines.

This is where people can make an expensive assumption. The fall window can let you return to Original Medicare from Medicare Advantage, but it does not promise that you can buy any Medicare Supplement policy without medical questions. Your federal Medigap Open Enrollment Period is tied to when you are 65 or older and enrolled in Part B. Read the dedicated Medigap open enrollment guide before treating October as a guaranteed chance to add a supplement.

If you are turning 65, delaying Part B because of active employer coverage, or worried that you missed your first chance to sign up, the question is probably not annual enrollment. It is which personal enrollment period applies to you. Medicare explains that the Initial Enrollment Period for Part A and Part B is generally a seven-month window around your 65th birthday, while other situations may create a Special Enrollment Period.

Do Not Mix Up These Medicare Dates

Medicare uses several enrollment periods, and the names are close enough to cause confusion. The safest approach is to match the date to the action you need to take, not to rely on a vague memory that enrollment happens in the fall.

Initial Enrollment Period: This is usually your first chance to sign up for Medicare Part A and Part B. It generally begins three months before the month you turn 65 and ends three months after that month. Medicare’s sign-up guidance explains when this period applies and why working past 65 can change the timing.

General Enrollment Period: This runs January 1 through March 31 for people who missed an earlier chance to sign up for Part A or Part B and do not qualify for a Special Enrollment Period. Coverage begins the month after you sign up, and late enrollment penalties can apply. The Medicare coverage start-date page explains this timing.

Medicare Advantage Open Enrollment Period: This runs January 1 through March 31, but it is for people who are already in a Medicare Advantage plan. It can allow one plan change or a return to Original Medicare, with limits. It is different from the fall period and is not an extra chance for everyone to make any Medicare change they want.

Medigap Open Enrollment: This is a one-time six-month period that usually begins when you are 65 or older and Part B starts. It is not the October 15 through December 7 window. That distinction is especially important for someone considering a move from Medicare Advantage to Original Medicare with a supplement.

Special Enrollment Periods: A move, loss of qualifying coverage, Medicaid or Extra Help change, or another Medicare-recognized life event may give you a separate period to make a change. The timing and choices depend on the event. If your situation changed outside the fall window, review the site’s Special Enrollment Period guide instead of waiting on the wrong deadline.

A person comparing a medication list, pharmacy bottles, and a generic plan worksheet

What to Review Before October 15

A better annual enrollment decision usually starts before the window opens. In September, Medicare Advantage and Part D members should watch for their Annual Notice of Change, often called an ANOC. This notice describes how the plan says it will change on January 1. It may include changes to premiums, deductibles, copays, benefits, provider networks, drug lists, pharmacy networks, and rules such as prior authorization.

Open the notice and compare it with what you actually use. D M Cook Insurance’s Annual Notice of Change checklist walks through the specific items worth checking. A plan does not have to become dramatically different to become a poor fit. A small shift in a prescription tier, a specialist copay, or a preferred pharmacy can change what you pay over a full year.

Prepare four short lists before you compare plans: your medications with dosage and frequency; doctors, specialists, and preferred hospitals; pharmacies you can realistically use; and the care you expect in the next year. Include a surgery, a new diagnosis, a planned move, or a budget change if any of those are on the horizon. These details turn a general plan search into a useful comparison.

Prescription costs deserve their own review. Check whether every medication is covered, which tier applies, whether prior authorization or step therapy is required, and whether your pharmacy is preferred. The site’s Part D drug coverage guide and Georgia Part D plan guide can help you prepare the right questions before you compare.

A Practical Annual Enrollment Checklist

Start with the plan you already have. Read the Annual Notice of Change beside your current member card, recent pharmacy receipts, and a list of doctors. Mark any change that affects a service or medicine you use. Then compare total yearly cost, not just the advertised premium. A low premium can be outweighed by a higher deductible, more expensive prescriptions, or copays that do not fit your expected care.

Next, confirm network fit if you have or are considering Medicare Advantage. Check primary doctors, specialists, hospitals, and facilities that matter to you. Do not assume a doctor is included because they accepted the plan last year or because an office accepts a different plan from the same insurer. Confirm the exact plan for the coming year.

Finally, compare the tradeoffs in plain language. A plan with extra dental or vision benefits may still be less suitable if it makes your medical care or prescriptions harder to manage. A plan with a higher premium may be worth considering if it better protects the costs you can predict. The right answer is personal, which is why the best comparison starts with your care rather than a generic ranking.

A person comparing a doctor list with a generic network diagram and a phone

When It Makes Sense to Ask for Help

It can make sense to ask for help when a plan notice is hard to read, your prescriptions have changed, a doctor is no longer in network, or you are considering a switch between Medicare Advantage and Original Medicare. It is also wise to pause before making a change that affects drug coverage or Medigap eligibility. The goal is not to make the process bigger than it needs to be. It is to avoid a rushed decision based on only one part of the picture.

David Cook helps Georgia residents review the details that often decide whether a plan works: doctors, hospitals, medications, pharmacies, premiums, copays, benefit rules, and enrollment timing. The guidance is free and centered on clear choices, not pressure to change coverage.

If you want a second set of eyes before the December 7 deadline, gather your current plan information, Annual Notice of Change, medication list, and preferred providers. Then send D M Cook Insurance a question or call David. Bringing the real information makes the conversation more useful and the decision less stressful.

Medicare annual enrollment is October 15 through December 7. Use the time to review, not to panic. If your coverage still fits, keeping it can be the right choice. If the details changed, the fall window gives you a regular chance to choose coverage that better fits the year ahead.

Frequently asked questions

When is Medicare annual enrollment in 2026?

Medicare Open Enrollment, also called the Annual Enrollment Period, runs from October 15, 2026, through December 7, 2026. Changes made during that window generally begin January 1, 2027.

Do I have to change my Medicare plan during annual enrollment?

No. You do not have to make a change if your current coverage still fits your doctors, prescriptions, pharmacy, budget, and care needs. The important step is reviewing the next year's plan details before the deadline.

Can I switch from Medicare Advantage to Original Medicare during annual enrollment?

Yes. During the fall Open Enrollment Period, you can switch from Medicare Advantage to Original Medicare. Before doing so, confirm how you will handle Part D drug coverage and whether you can get a Medigap policy on terms that work for your situation.

Is Medicare annual enrollment the same as signing up for Medicare at 65?

No. Annual enrollment is the fall period for reviewing or changing Medicare Advantage and drug coverage. Your first chance to sign up for Medicare Part A and Part B is usually a separate Initial Enrollment Period around your 65th birthday.

What should I check during Medicare annual enrollment?

Review your plan's next-year premium, deductible, copays, maximum out-of-pocket amount, doctors and hospitals, prescriptions and drug tiers, pharmacy options, and any benefits or rules you rely on. Your Annual Notice of Change is a useful starting point.

Can D M Cook Insurance help me review Medicare coverage?

Yes. David Cook can help Georgia residents compare Medicare coverage against their doctors, prescriptions, pharmacy choices, budget, and the timing of any proposed change.