The window that matters most is built around your 65th birthday

For most people in Nashville and the counties around it, the first real Medicare decision is timing. Your Initial Enrollment Period is 7 months long: the 3 months before your birthday month, your birthday month itself, and the 3 months after. Filing early inside that window is what lets your coverage begin the day you turn 65 rather than weeks or a month later, which is the difference between a clean handoff from whatever you have now and a gap you cover out of pocket. Those dates key off your birthday month, so we put them on a calendar with you rather than leave you to work them out.

There are two pieces to decide inside that window. Part A (hospital coverage) is premium-free for most people with 40 or more quarters of work history — $0 a month in 2026. A shorter work record means Part A carries a premium: $311 a month with 30 to 39 quarters, and $565 a month with fewer than 30. Part B (medical coverage) has a premium for everyone — $202.90 a month in 2026, with an annual deductible of $283. Higher incomes pay more for Part B through an income-related adjustment that starts above a modified adjusted gross income of $109,000 for one person or $218,000 for a couple filing jointly.

Still working past 65? Your window probably moves

A lot of people in Davidson, Williamson and Rutherford counties are still on the job at 65, and that changes the calendar. If you or your spouse have health coverage through a job one of you currently holds, you may be able to delay Part B without a penalty and pick up a Special Enrollment Period when that work or that coverage ends. Whether it applies turns on how many employees the employer has and on whether the coverage comes from current work rather than a former job — our guide to how Medicare works alongside employer coverage in Tennessee walks through both tests. Guessing here is expensive, because a wrong guess usually shows up later as a Medicare late enrollment penalty that never comes off your premium.

The windows that come back every year

Once you are on Medicare, the calendar settles into a rhythm. Each window allows different things, and knowing which one you are standing in is most of the battle. These are the rules; which of them is actually open to you depends on your own circumstances, and that is something we work through with you rather than something anyone should assume from a page:

  • The Annual Enrollment Period, October 15 to December 7. Anyone with Medicare can join, drop or switch a Medicare Advantage plan, or join, drop or switch a stand-alone Part D prescription drug plan. Changes take effect January 1. This is the window where most plan changes happen, and it is the one we use to re-check your plan against next year's version of itself.
  • The Medicare Advantage Open Enrollment Period, January 1 to March 31. This one is only for people already enrolled in a Medicare Advantage plan, and it allows a single change — either to a different Medicare Advantage plan, or back to Original Medicare with a stand-alone drug plan added. It cannot be used to move from Original Medicare into a Medicare Advantage plan.
  • The General Enrollment Period, January 1 through March 31. A fallback for people who missed their Initial Enrollment Period and do not have a Special Enrollment Period to use. Coverage starts later, so it can leave you with both a gap and a late enrollment penalty.
  • Special Enrollment Periods. Specific life events open a window outside the usual calendar — employment or employer coverage ending, a move, or a change in other coverage you were counting on. The one tied to employer coverage runs 8 months from the end of the employment or the end of that coverage.

Moving is the one we see most often in Middle Tennessee, and it is not only an out-of-state move. Medicare Advantage and Part D availability can vary by county and ZIP code, so a move from Nashville out to Spring Hill, Gallatin, Mount Juliet or Smyrna can change which plans are offered to you even though your doctors have not changed at all. The same is true in reverse for people moving into Davidson County from Wilson or Sumner. It is worth checking before the boxes are packed rather than after.

Coming to Medicare before 65

Medicare is not only a 65th-birthday program. People who receive Social Security Disability Insurance generally wait 24 months for Medicare to begin, and those 24 months do not have to run consecutively. There are two well-known exceptions: ALS, where there is no five-month disability waiting period and no 24-month Medicare wait, and Parts A and B are set up for you; and end-stage renal disease, which follows its own path rather than the standard 24-month one. If you left a job and took COBRA, the disability extension runs about 29 months, which can bridge most or all of the wait.

Tennessee has not expanded Medicaid, so for some people under 65 that waiting period is a genuine gap rather than a technicality, and we would rather say that plainly than pretend otherwise. The Jordan Insurance Agency works on the Medicare side — we do not sell or advise on TennCare, and we will not pretend to be a TennCare resource. What we can do is be ready on the day your Medicare does start.

Tennessee is unusually generous on one point here. An insurer that sells Medicare Supplement coverage to people 65 and older has to offer those same plans to people under 65 who have Medicare through disability or end-stage renal disease. That is broader than most states, and it means Medigap may be worth a look earlier than you would expect — see what a Medicare Supplement (Medigap) plan is in Tennessee.

Your Medigap window runs on its own calendar

Whatever else you decide, the Medicare Supplement clock is separate and it is short. Your Medigap Open Enrollment Period is six months long and begins the first month you are both 65 or older and enrolled in Part B. Inside those six months you can buy any Medigap plan sold in Tennessee without answering health questions. Once it closes, insurers can generally ask about your health, which may change the price or the answer.

Here is the reassuring part for anyone who came to Medicare early: a decision made under 65 is not your last one. That full six-month window still opens at 65, no matter what you chose before.

Do not let the prescription side slide

Enrollment timing is not only about Parts A and B. Going without drug coverage after you were first eligible, and without other creditable prescription drug coverage in its place, carries its own lasting cost. Our guide to how Medicare Part D works in Tennessee covers what the coverage does and what the 2026 and 2027 limits are.

Why this is a Tennessee page and not a generic one

Nashville is unusual in that three large health systems — Vanderbilt, Ascension Saint Thomas and TriStar — all operate widely across the same city, and it is completely normal for one household to use two of the three. That turns an enrollment question into a network question: whichever window you are standing in, the real decision underneath it is which doctors and hospitals your household needs to keep. Layer on the fact that plan availability varies by county and ZIP code across Davidson, Williamson, Sumner, Wilson and Rutherford counties, and the version of this question that gets answered in Franklin is not necessarily the one that gets answered in Lebanon or La Vergne. Our Medicare page for Nashville has more on how we work locally.

How The Jordan Insurance Agency helps

We start by putting your actual dates on paper — your birthday month, your employer coverage if you have it, the day a plan ends — and work out which window you are in before anyone talks about plans. Then we check your doctors, your prescriptions and your pharmacy against the options actually offered in your county, and we come back to it every year, because plans change even when you do not.

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.