Turning 65 Medicare Checklist: What to Do and When
Quick answer: If you're turning 65, you have a 7-month Initial Enrollment Period to sign up for Medicare — it starts 3 months before your birthday month, includes your birthday month, and ends 3 months after. The single most important early step is figuring out whether you (or a spouse) have creditable employer coverage, since that determines whether you should enroll in Medicare right away or delay part of it without penalty. Below is a step-by-step checklist to help you get it right the first time.
Step 1: Know Your Enrollment Window
Your Initial Enrollment Period (IEP) is a 7-month window: 3 months before the month you turn 65, your birthday month itself, and 3 months after. This is the single most important date range in the entire process, because when you enroll within this window determines when your coverage starts and helps you avoid late-enrollment penalties.
Checklist:
Confirm the exact month your IEP begins (3 months before your birthday month)
Mark your IEP start and end dates on a calendar
Understand that enrolling in the earlier months of your IEP generally gets your coverage started faster than waiting until your birthday month or after
Common question — when exactly does my Medicare start if I enroll during my IEP? Coverage generally begins the month after you enroll if you sign up in the 3 months before or during your birthday month; if you enroll in one of the 3 months after your birthday month, coverage can be delayed further, which is one more reason not to wait until the last minute
Step 2: Determine Whether You're Still Working — and Whether That Changes Anything
This is the step that trips up more people than any other. If you or your spouse are still working and covered by an employer group health plan, your next move depends heavily on the size of that employer
Checklist:
Find out whether your employer (or your spouse's) has 20 or more employees
If yes, ask your HR or benefits department whether your coverage is considered "creditable" for Medicare purposes
If your employer coverage is creditable and the employer has 20+ employees, you may be able to delay Part B (and sometimes Part A) without a penalty until you stop working or lose that coverage
If your employer has fewer than 20 employees, Medicare typically becomes your primary coverage at 65 regardless of employment status — delaying enrollment in this situation often leads to coverage gaps and penalties
Ask specifically about Health Savings Account (HSA) contributions — enrolling in any part of Medicare stops your ability to contribute to an HSA, which matters if you or your employer are still making contributions
Common question — do I have to stop working to get Medicare? No. You can have both Medicare and employer coverage in some cases, but whether Medicare or your employer plan pays first ("primary" vs. "secondary") depends on employer size — getting this wrong can lead to unpaid claims, so it's worth confirming directly rather than assuming.
Step 3: Decide Between Original Medicare and Medicare Advantage
Once you know your enrollment timing, the next big decision is which overall path fits you: Original Medicare (Parts A and B, often paired with a Medigap policy and a standalone Part D plan) or Medicare Advantage (Part C, an all-in-one private-insurer alternative).
Checklist:
List your current doctors and specialists, and check whether they're important to keep seeing without a network restriction
List your current prescriptions
Think through how often you travel or split time between locations
Consider your comfort level with a fixed monthly premium (Medigap) versus a lower premium with potential per-visit costs (Medicare Advantage)
Review our How Medicare Works, Medicare Advantage, and Medicare Supplement pages for a full breakdown of each path
Common question — can I switch paths later if I choose wrong? Yes, but with caveats. You can move between Medicare Advantage and Original Medicare during the Annual Enrollment Period each fall, but if you want to add a Medigap policy after your Initial Enrollment Period ends, insurers can require medical underwriting unless you qualify for a guaranteed issue right.
Step 4: Plan for Prescription Drug Coverage
Even if you're not on any medications today, you'll need a plan for Part D — either standalone (with Original Medicare) or bundled into a Medicare Advantage plan.
Checklist:
Confirm whether you have other creditable prescription drug coverage (such as through an employer or the VA)
If not, plan to enroll in a Part D plan during your Initial Enrollment Period, even if you don't currently take medications
Understand that going 63+ days without creditable drug coverage after becoming eligible can trigger a permanent late-enrollment penalty
If you do take medications, compare specific formularies rather than assuming the lowest-premium plan is the cheapest overall — see our Medicare Part D page for details
Step 5: Understand the Costs You Should Expect in 2026
Budgeting ahead of time helps you compare plans without sticker shock later.
Checklist:
Budget for the standard Part B premium: $202.90/month in 2026
Check whether your income could trigger an IRMAA surcharge (extra Part B premium due to income levels from two years prior)
If considering Original Medicare + Medigap, budget for a separate monthly Medigap premium (commonly $60–$220+/month depending on plan and carrier)
If considering Medicare Advantage, note that many plans carry a low or $0 premium, but confirm the plan's out-of-pocket maximum and copay structure
Factor in your Part D premium and deductible (up to $615 in 2026) if choosing a standalone drug plan
Common question — will my income from a few years ago affect my premium now? Yes — IRMAA surcharges are based on your tax return from two years prior, so a high-income year (such as a large capital gain or Roth conversion) can increase your Medicare premiums two years later. This is worth discussing with a financial advisor if you're planning any major income events as you approach 65.
Step 6: Gather the Paperwork You'll Need
Checklist:
Social Security number
Proof of date of birth (if enrolling by mail or in person)
Details of any current health insurance, including employer coverage or COBRA
A list of current doctors, specialists, and preferred pharmacies
A list of current prescriptions, including dosages
If delaying Part B due to employer coverage, be ready to complete an Employer Group Health Plan verification form when you do eventually enroll
Step 7: Enroll
Checklist:
Apply through the Social Security Administration (online, by phone, or in person) if enrolling in Part A and/or Part B
Confirm your effective coverage start date in writing
Keep copies of all confirmation paperwork
Once you are enrolled, work with a local independent Medicare agent to review your options and put a plan in place
Step 8: Review Annually — Don't "Set and Forget"
Your Medicare decision isn't a one-time event. Plans, networks, formularies, and costs can all change every year.
Checklist:
Mark the Annual Enrollment Period (October 15 – December 7) on your calendar every year
Review whether your current plan's formulary still covers your medications affordably
Check whether your doctors are still in-network (if on Medicare Advantage)
Revisit your coverage anytime you have a major health change, move, or income change
Common Mistakes to Avoid When Turning 65
Assuming employer coverage means you can ignore Medicare entirely — this depends on employer size and can lead to penalties if assumed incorrectly
Waiting until your birthday month to start the process — starting in the earlier part of your IEP avoids coverage delays
Skipping Part D because you're not on medications — this can trigger a permanent penalty later
Not budgeting for IRMAA if you've had a recent high-income year
Assuming all Medicare Advantage or Medigap plans are the same — costs and coverage details vary significantly by carrier and plan letter/tier
Not reviewing coverage annually — plans change every year, even if you don't
Frequently Asked Questions
What is the Medicare Initial Enrollment Period? A 7-month window centered on your 65th birthday — 3 months before your birthday month, your birthday month, and 3 months after — during which you can enroll in Medicare Parts A, B, and D without penalty.
Do I need to sign up for Medicare if I'm still working at 65? It depends on your employer's size. If your employer has 20 or more employees and your coverage is creditable, you may be able to delay Medicare without penalty. If your employer has fewer than 20 employees, Medicare typically becomes primary at 65 regardless of employment status.
What happens if I miss my Initial Enrollment Period? You may face permanent late-enrollment penalties on Part B and Part D, and your next opportunity to enroll may be limited to the General Enrollment Period, with coverage starting later than you'd like.
Do I need both Medicare and a Medicare Supplement plan? Not necessarily — Medigap is optional and pairs with Original Medicare. If you choose Medicare Advantage instead, you would not add a separate Medigap policy.
What documents do I need to enroll in Medicare? Typically your Social Security number, proof of date of birth, details of any current health coverage, and information about your doctors and prescriptions.
Can I get help going through this checklist? Yes. A licensed local advisor can walk through your specific employment situation, income, doctors, and prescriptions to help you avoid the most common — and costly — mistakes.
Get Personalized Help With Your Turning-65 Checklist
Every situation is a little different, especially if you're still working, have a high-deductible health plan, or are approaching a high-income year. Schedule a free, no-obligation consultation and we'll walk through this checklist with you, step by step.
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This page is for educational purposes and does not constitute a recommendation of any specific plan or carrier. We do not offer every plan available in your area. We are not connected with or endorsed by the U.S. government or the federal Medicare program.