If you are turning 65 soon, Medicare should be on your radar well before your birthday month.

Most people do not run into trouble because Medicare is impossible. They run into trouble because they wait too long, assume employer coverage works one way when it actually works another way, or enroll in the wrong plan without comparing the details.

The good news is that this is manageable if you start early. Here is a simple Medicare checklist for what to do before turning 65.

What Should You Do Before Turning 65?

Start preparing about 6 months before your 65th birthday. That gives you enough time to confirm whether you need Medicare right away, understand your enrollment window, compare plan options, and avoid common mistakes like COBRA confusion or HSA contribution penalties.

If you want the short version, here it is:

  1. Confirm whether you need to enroll at 65.
  2. Learn your Initial Enrollment Period dates.
  3. Decide whether you are keeping employer coverage or moving to Medicare.
  4. Compare Medicare Supplement, Medicare Advantage, and Part D options.
  5. Make sure HSA or COBRA rules do not trip you up.

Medicare Checklist: 6 Months Before Turning 65

Six months out is the right time to get organized.

1. Find out whether you actually need Medicare at 65

This is the first question because everything else flows from it.

If you are already collecting Social Security, Medicare enrollment often happens automatically. If you are still working, the answer depends largely on your employer coverage and employer size. I break that down in more detail here: Do you need Medicare at 65 if you’re still working?

If your employer has 20 or more employees, you may be able to delay Part B without penalty while you remain actively covered. If your employer has fewer than 20 employees, Medicare usually becomes primary at 65 and delaying can cause major problems.

2. Mark your Initial Enrollment Period on your calendar

Your Initial Enrollment Period is a 7-month window:

  1. 3 months before your birthday month
  2. your birthday month
  3. 3 months after your birthday month

This is the most important Medicare deadline most people will ever have. If you miss it without qualifying coverage, you can face permanent penalties and delayed coverage.

If you want more detail on those mistakes, these articles are worth reading next: 7 costly Medicare mistakes when turning 65 and what happens if you do not sign up for Medicare at 65.

3. Make a list of your current doctors, prescriptions, and preferred pharmacies

Do not wait until the last minute to do this.

If you are comparing plans, you need to know:

  1. which doctors you want to keep
  2. which prescriptions you take
  3. which pharmacies you prefer

That is especially important if you are considering a Medicare Advantage plan or comparing Part D drug plans. Drug coverage can look inexpensive until you check the formulary, deductible, tiers, and pharmacy pricing. I go deeper on that here: How to compare Medicare Part D plans

Medicare Checklist: 3 Months Before Turning 65

This is when the real decision-making should start.

4. Decide whether you are enrolling in Original Medicare or delaying

By this point, you should know whether Medicare will begin now or later.

If you are enrolling now, you will usually be deciding between:

  1. Original Medicare plus a Medicare Supplement and Part D plan
  2. a Medicare Advantage plan

If you are not sure which direction fits you better, this comparison is a good starting point: Medicare Advantage vs. Medigap in the Kansas City area

5. Review your estimated costs

Before turning 65, look at the full picture, not just a premium.

Compare:

  1. Part B premium
  2. Medicare Supplement premium, if applicable
  3. Part D premium and drug costs
  4. Advantage plan copays and maximum out-of-pocket exposure

Many people are surprised by what Medicare actually costs versus what they assumed. This article can help frame that conversation: What Medicare really costs in 2026

If your income is on the higher side, remember that your Part B and Part D costs may be higher because of IRMAA. You can check that quickly with our free 2026 IRMAA Calculator.

6. Check whether HSA rules apply to you

If you contribute to a Health Savings Account, this matters a lot.

Once you enroll in any part of Medicare, you generally can no longer make HSA contributions. That includes premium-free Part A. Many people discover this after they have already created a tax problem for themselves.

If that is your situation, read this before you enroll: Medicare and HSA contributions after 65

Medicare Checklist: 1 Month Before Turning 65

At this point, you should be tightening up the details.

7. Make sure you are not relying on COBRA as a Medicare strategy

This is one of the most expensive misunderstandings I see.

COBRA may keep you insured, but it does not protect you from Medicare late enrollment penalties the way active employer coverage can. If COBRA is part of your retirement or transition plan, read this carefully: Medicare and COBRA: the expensive mistake thousands of retirees make

8. Choose the plan structure you want before your effective date

If you are going with Original Medicare, this is when you should narrow down:

  1. which Medigap plan letter fits you
  2. which carrier you want
  3. which Part D plan best matches your prescriptions

If you are going with Medicare Advantage, this is when you should verify:

  1. your doctors are in-network
  2. your medications are covered
  3. the plan’s maximum out-of-pocket fits your budget

9. Gather the information you will need to enroll

That usually includes:

  1. your Social Security information
  2. proof of age and identity if needed
  3. employer coverage documentation if you are delaying Part B
  4. your medication list and preferred pharmacy

Getting those details together ahead of time makes the enrollment process much smoother.

What Should You Do During Your Birthday Month?

If you already enrolled early, your coverage may begin now. If you waited until your birthday month to act, pay close attention to effective dates because coverage can be delayed depending on when you enroll.

This is also the time to double-check:

  1. that your Medicare card information is correct
  2. that your selected plan is active
  3. that your prescriptions and doctors line up with the plan you chose

What Are the Biggest Medicare Mistakes to Avoid Before Turning 65?

The biggest mistakes are usually very predictable:

  1. waiting too long to learn the rules
  2. assuming all employer coverage works the same way
  3. thinking COBRA solves the Medicare problem
  4. forgetting about HSA contribution rules
  5. choosing a plan based only on premium

That last mistake matters more than people think. The wrong cheap plan can cost much more later if your drug coverage is weak, your doctors are out-of-network, or your out-of-pocket exposure is too high.

Do You Need Help Comparing Medicare Options Before 65?

If you are within a few months of turning 65, this is exactly the point when a side-by-side review can help.

I work with people in Kansas City, Blue Springs, Independence, and throughout the Kansas City metro to help them compare Medicare Supplement, Medicare Advantage, and Part D options in plain English.

The goal is not to make Medicare feel complicated. The goal is to make sure you enroll on time, avoid preventable mistakes, and choose coverage that actually fits your doctors, prescriptions, and budget.

Frequently Asked Questions

When should I start preparing for Medicare before turning 65?

Ideally, start about 6 months before your 65th birthday. That gives you time to understand your enrollment window, employer coverage rules, HSA issues, and plan choices without rushing.

What is the most important thing to do before turning 65 for Medicare?

The most important thing is confirming whether you need to enroll at 65 or whether you can safely delay because of active employer coverage. That answer determines whether missing your enrollment window could create penalties.

Can I wait until my birthday month to sign up for Medicare?

You can, but it is usually better to start earlier. Waiting until your birthday month can delay your coverage start date and compress your decision-making timeline.

Do I need a Part D plan when I turn 65?

If you do not have other creditable drug coverage, yes, you should strongly consider Part D when you become Medicare-eligible. Even if you do not take many medications now, delaying Part D without creditable coverage can lead to penalties later.