The Annual Enrollment Period is your yearly checkpoint

The Medicare Annual Enrollment Period — most people shorten it to AEP — runs October 15 to December 7 every year. Anything you change inside it takes effect on January 1. It is the one window on the calendar open to everyone who already has Medicare, regardless of birthday, employment or address, and it is the window we build our fall around here in Nashville.

What it is for is worth saying plainly, because the advertising that fills Middle Tennessee mailboxes every October tends to obscure it. AEP is not a sales season. It is an annual review: a built-in chance to hold the coverage you have against the version of itself that will exist next year, and against the doctors and medications you have now rather than the ones you had when you first enrolled.

What you can change between October 15 and December 7

  • Join a Medicare Advantage plan, switch from one Medicare Advantage plan to another, or drop Medicare Advantage and return to Original Medicare.
  • Join a stand-alone Part D prescription drug plan, switch to a different one, or drop drug coverage altogether.
  • Add a stand-alone Part D plan when you move back to Original Medicare, so the prescription side does not get left behind.

That last point deserves a flag. Dropping drug coverage with nothing to replace it is the change people make casually and regret permanently. A gap of 63 days or more without other creditable prescription drug coverage after you were first eligible triggers a surcharge of roughly 1% of the national base beneficiary premium — $38.99 in 2026 — for each full month you went without, and it stays on your premium for as long as you have Part D. Our guide to how the Medicare late enrollment penalty works sets out the arithmetic.

What the Annual Enrollment Period is not

Three other windows get confused with this one every year, and knowing which one you are standing in is most of the work.

  • It is not your Initial Enrollment Period. If you are coming up on 65, your first window is the 7 months around your birthday month — the 3 months before, the month itself, and the 3 months after. That is a different window with different rules; our guide to when you can enroll in Medicare in Tennessee lays them out side by side.
  • It is not the Medicare Advantage Open Enrollment Period. That narrower window runs January 1 to March 31, is only open to people already in a Medicare Advantage plan, and allows a single change. You cannot use it to move from Original Medicare into Medicare Advantage.
  • It does not govern Medicare Supplement policies. Medigap runs on its own calendar: a six-month window starting the first month you are both 65 or older and enrolled in Part B, after which insurers can generally ask health questions. What a Medicare Supplement (Medigap) plan is in Tennessee explains why that timing is unforgiving.

Why AEP matters even when you are happy with your plan

The most common reason people skip the review is that nothing went wrong last year. That is a reasonable instinct and a poor test, because the plan you are happy with is allowed to rewrite itself before January. Each autumn your plan sends an Annual Notice of Change setting out what will be different — the drug list and the tier each medication sits in, the pharmacy network, the provider network, the cost sharing, and any extras. Reading the Annual Notice of Change is the most useful hour of the fall, and that letter is your comparison baseline right up to December 7.

Your own life moves too. A new prescription, a new specialist, a surgery scheduled for spring, a move across a county line — any of those can make a plan that fit last year the wrong shape now.

In Middle Tennessee, the annual review is really a network review

This is where AEP looks different in Nashville than it does elsewhere. Three large health systems — Vanderbilt, Ascension Saint Thomas and TriStar — all operate widely across the same city rather than dividing it into territories. It is completely ordinary for one household to be using two of the three without ever having decided to: a primary care doctor in one system, a cardiologist or an orthopedic surgeon in another, and the closest hospital belonging to a third.

A household arranged that way has more to check every October, not less. A network change that would be a non-event for someone who uses a single system can sever one half of your care from the other. So we do not check whether a plan “covers Nashville.” We check each doctor you see, by name and by the location you actually drive to, against next year's directory — and we do it for both sides of the household, because two people on two plans means two notices and four lists.

Your county, not your city, sets the menu

Medicare Advantage and Part D availability can vary by county and ZIP code. The plans offered in Davidson County are not automatically the plans offered in Williamson, Sumner, Wilson or Rutherford. Someone in Franklin, Brentwood, Spring Hill or Nolensville may see a different list than someone in Gallatin or Hendersonville, and different again from Lebanon, Mount Juliet, Murfreesboro, Smyrna or La Vergne — even when all of them drive into Nashville to see the same specialist.

Which means a neighbor's recommendation is evidence about their county and their medications, not about yours. That is worth saying out loud in a season when everyone has an opinion. Our Medicare page for Nashville covers how we work across these counties.

Doing nothing is itself a decision

If you let December 7 pass, you are not dropped and there is no penalty for staying. You simply roll into next year's version of your plan, having accepted every change in it by default — including any you would have objected to had you seen them. Sometimes that is exactly the right outcome and the review takes ten minutes. The point is to make it a decision rather than an oversight.

If cost is the pressure behind the review

For some households the fall question is not which plan but whether any of it is affordable. Programs exist that help with Medicare costs, and the 2026 monthly income limits for one person are $1,330 for QMB, $1,596 for SLMB and $1,796 for QI, with a resource limit of $9,950. Extra Help, which assists with prescription costs, uses $23,940 in income and $18,090 in resources for one person. We will not tell you across a desk that you qualify or do not — that gets checked against your actual circumstances, never assumed.

How The Jordan Insurance Agency helps

Our fall is deliberately repetitive. We take your current plan, your doctor list with locations, your medications with dosages and your pharmacy, and we hold all of it against every plan offered in your county for next year. If nothing that matters to you moved, we say so and you keep what you have. If something moved, you have until December 7 to do something about it, and we show you what the alternatives would cost across a whole year rather than on a premium line. Then we come back and do it again the following October, because the plans will have changed whether or not you did. If you are weighing the two roads rather than tuning one, start with what Medicare Advantage is in Tennessee.

The Jordan Insurance Agency is an independent, licensed insurance agency with a Tennessee office at 159 4th Avenue N, Suite 100, Nashville, TN 37219. You can reach us at (615) 558-6082, Monday through Friday, 8:00 AM to 4:00 PM Central. Because we are independent we represent multiple carriers rather than one, so we can lay your real options side by side instead of steering you toward a single company. A consultation with a licensed agent is free, and your premium is the same whether you enroll on your own or with our help.