Turning 65, and what you actually have to do about Medicare

    Medicare arrives with a stack of mail, a lot of acronyms, and a deadline nobody explains clearly. Most of it can wait. A few things cannot, and the ones that cannot carry penalties that follow you permanently. This page is the starting point. What the parts are, what you have to decide, when you have to decide it, and which choices are hard to undo.

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    The parts, in plain terms

    Part A covers hospital stays. Most people have paid for it through payroll taxes over their working life and pay no monthly premium for it.

    Part B covers doctor visits and outpatient care. It has a monthly premium.

    Together, A and B are Original Medicare. That's the government program.

    From there you choose one of two paths.

    Path one

    Original Medicare plus supplements. You keep A and B, add a Medicare Supplement to cover what Medicare leaves behind, and add a Part D plan for prescriptions. Three pieces, broadest doctor access, higher monthly cost.

    Path two

    Medicare Advantage. A private plan delivers your A and B benefits instead, usually bundles prescriptions, and often adds dental and vision. One piece, network restrictions, lower monthly cost.

    That's the whole structure. Everything else is detail.

    When you have to act

    Your first enrollment window opens three months before the month you turn 65 and closes three months after it.

    Seven months total, with your birthday month in the middle.

    Enrolling in the months before your birthday generally means coverage starts sooner. Waiting until after can delay it.

    If you're already receiving Social Security, you're usually enrolled in A and B automatically and a card arrives. If you're not, you have to sign up yourself. Nobody does it for you.

    The two penalties

    These are the reason the timing matters, and both are permanent.

    Part B

    Delay enrolling without qualifying coverage from an employer and your premium can be increased for as long as you have Part B. It doesn't expire.

    Part D

    Go without creditable drug coverage after becoming eligible and a surcharge gets added to your premium when you eventually enroll. Also permanent.

    The Part D penalty catches healthy people specifically. Someone taking no medications skips it as pointless, needs something at 71, and finds a lifelong surcharge attached. A low-premium plan is usually cheaper than the penalty you're avoiding.

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    If you're still working at 65

    This is where most of the real confusion lives, and the answer genuinely depends on your situation.

    If you have coverage through an employer, whether to delay Part B depends on the size of that employer and how their plan coordinates with Medicare. Some employer coverage lets you delay without penalty. Some does not, and staying on it can leave you with gaps you don't discover until you file a claim.

    Two things to sort out before your window closes. Whether your employer plan counts as creditable coverage, which the plan is required to tell you. And whether you have an HSA, because contributions have to stop once you enroll in Medicare, and the timing rules there trip people up regularly.

    This is worth a conversation rather than a guess. The consequences of getting it wrong are permanent and the answer is specific to your employer.

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    The decision that's hardest to reverse

    A couple in their sixties reviewing documents together at a kitchen table, weighing an important decision.

    Choosing between a Supplement and Advantage feels like a cost comparison. It's also a timing decision.

    When you first enroll in Part B you have a one-time window with guaranteed issue rights for a Supplement. An insurer must sell you one regardless of your health.

    Outside that window, in most states, they can review your health history and charge more or decline you.

    So going with Advantage at 65 and wanting a Supplement at 70 can mean underwriting, at exactly the age when a health condition makes passing it harder. Moving the other direction is easy.

    That asymmetry is the most important thing on this page.

    It doesn't mean Advantage is wrong. It means the first decision deserves more thought than the premium comparison suggests.

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    What to do, in order

    1. 1Confirm whether you're being enrolled automatically or need to sign up.
    2. 2Find out whether any current coverage counts as creditable.
    3. 3If you have an HSA, sort out the contribution timing before you enroll.
    4. 4List your doctors and your prescriptions. Both drive the plan choice.
    5. 5Compare the two paths on total annual cost, not monthly premium.
    6. 6Make the Supplement decision deliberately, knowing the window doesn't reopen.
    7. 7Line up Part D, whether standalone or bundled.

    Common questions.

    Is Medicare free?
    Part A usually has no premium if you've worked enough quarters. Part B has one. Supplements, Advantage, and Part D have their own costs.
    Do I have to enroll at 65?
    Not if you have qualifying employer coverage. Otherwise, delaying risks permanent penalties.
    Does Medicare cover dental, vision, or hearing?
    Original Medicare generally does not, which surprises nearly everyone. Many Advantage plans include some coverage, and standalone dental and vision plans exist.
    What about my spouse?
    Medicare is individual. Your spouse enrolls based on their own age and situation.
    Can I change my mind later?
    There are windows each year to switch. Getting a Supplement later without underwriting is the part that isn't guaranteed.
    Does Medicare cover long-term care?
    Generally no. It covers limited skilled nursing after a qualifying hospital stay, not ongoing custodial care. That's a separate planning question.
    I'm getting a lot of mail. Do I need to respond to it?
    Most of it is marketing. The notices that matter come from Social Security, Medicare, and your current plan.

    Compare your other Medicare options

    Medicare Advantage

    A private plan that bundles your coverage.

    See how it works

    Medicare Supplements

    Works alongside Original Medicare to cover what it leaves behind.

    See how it works

    Medicare Part D

    Prescription drug coverage.

    See how it works

    Turning 65 in the next year?

    A licensed advisor will walk you through your timeline, tell you what applies to your employer coverage, and compare both paths side by side.

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