Do You Have to Sign Up for Medicare at 65 in Illinois?

No, you don't have to sign up for Medicare at 65 in Illinois. No federal or Illinois law forces you onto Medicare on your birthday. But if you skip it without the right kind of other coverage, Medicare charges you for that decision every month for as long as you have Part B.

And there's a second question tangled up in this one: can you get Medicare without Social Security? Yes. Plenty of Illinois residents start Medicare at 65 and hold off on Social Security until 67 or 70. You just have to do the paperwork yourself, because nothing happens automatically.

Medicare's enrollment rules are federal, so they work the same in Illinois as anywhere else. Which camp you're in depends on 2 things: whether you're already collecting Social Security, and what health coverage you have the month you turn 65.

If you already collect Social Security, you're enrolled automatically

If you've been getting Social Security (or Railroad Retirement Board) benefits for at least 4 months before you turn 65, Medicare signs you up for <strong>Part A</strong> and <strong>Part B</strong> automatically. Your Medicare card shows up at your Illinois address about 3 months before your 65th birthday.

You can turn down Part B. The card packet tells you how, and it makes sense if you're still covered by a large employer's plan (more on that below). Just don't send it back on a whim. Declining Part B without qualifying coverage starts the penalty clock.

Part A is a different story. Once you're collecting Social Security retirement benefits, you can't drop premium-free Part A. The only way out is to withdraw your Social Security application and pay back every benefit you've received. Almost nobody does that, and it rarely makes sense.

If you haven't started Social Security, you have to sign up yourself

Full retirement age is now 67 for anyone born in 1960 or later. Medicare eligibility didn't move. It's still 65. So a lot of people in Illinois hit 65 without a Social Security check, and those people are not enrolled automatically.

You apply for Medicare through Social Security (online, by phone, or at a local Illinois Social Security office) and ask for Medicare only. Your Initial Enrollment Period is 7 months long: the 3 months before your birthday month, the birthday month itself, and the 3 months after. Sign up in the first 3 months and coverage starts on the first of your birthday month. Wait until later in the window and it starts the month after you sign up.

The step that trips people up is paying for it. With no Social Security check, there's nothing to deduct the Part B premium from, so Medicare bills you directly. At the 2026 rate of $202.90 a month, a quarterly bill comes to $608.70.

"If you are not collecting Social Security yet, Medicare has nothing to deduct your Part B premium from. So Medicare bills you directly," says Jeremy Harkins, a licensed Medicare agent in Murfreesboro, Tennessee. "That bill is normally sent three months at a time. That is why the first bill can look much larger than expected."

You can switch to monthly payments through Medicare Easy Pay, which pulls the premium from your bank account. It can take 6 to 8 weeks to kick in, so pay the first bill another way. Once you do start Social Security, the premium moves over to your benefit check.

If you didn't work 10 years (40 quarters) paying Medicare taxes, and can't qualify through a spouse, Part A isn't free. In 2026 it costs $311 or $565 a month depending on your work history (see our breakdown of Part A costs and premiums). You can still get Medicare without enough Social Security work credits, but it gets expensive.

When it's safe to wait past 65

There's really one situation where delaying Part B is clean: you (or your spouse) are <strong>still working</strong> and covered by that job's group health plan, and the employer has 20 or more employees. In that setup, the employer plan pays first and Medicare would pay second, so Medicare doesn't penalize you for waiting.

When the job or the coverage ends (whichever happens first), you get an <strong>8-month Special Enrollment Period</strong> to sign up for Part B with no penalty. Your employer fills out a form proving you had coverage, and you file it with your Part B application.

A few things to check before you wait:

• Drug coverage. Your employer plan's prescription coverage has to be "creditable," meaning at least as good as standard Part D. HR sends a notice every year saying whether it is. If it isn't, you need a Illinois Part D plan at 65, and our guide on how to compare Part D plans walks through picking one.
• Part A. Many people still working take premium-free Part A at 65 since it costs nothing and can pay second behind the employer plan. The exception is HSAs.
• HSA contributions. Once you have any part of Medicare, you can't contribute to a Health Savings Account. Part A also backdates up to 6 months when you sign up after 65, so medicare.gov says to stop HSA contributions 6 months before you apply. If you're funding an HSA, you can delay Part A too.

When you should sign up at 65 anyway

These setups look like coverage but still leave Illinois residents exposed at 65:

• A small employer (under 20 employees). Medicare pays first at 65. If you skip Parts A and B, the employer plan may pay little or nothing on your claims.
• COBRA. COBRA doesn't count as current employment. Your 8-month window starts the day the job ends, and COBRA doesn't pause it. Ride COBRA for 18 months and you've blown the window.
• Retiree coverage. Same problem. Retiree plans usually expect Medicare to pay first.
• A Marketplace or individual plan. That includes any Marketplace plan you bought in Illinois. Once you have Part A, you lose any Marketplace premium savings, and a Marketplace plan doesn't protect you from the Part B penalty.
• No coverage at all. Sign up during your 7-month window. If money is the reason you're hesitating, Illinois runs Medicare Savings Programs that can cover the Part B premium for people with limited income.

"You could get a Lifetime Enrollment Penalty fee if you have individual insurance (a marketplace or private health insurance plan) or COBRA at the time you turn 65," says Annelies Van Schie, a licensed Medicare agent in Houston, Texas. She recommends applying for Part A when you turn 65 either way, since the Part B application tends to go through faster later when Part A is already in place.

What waiting without coverage actually costs

Each penalty is added to your premium for as long as you have that coverage, and it's recalculated against each year's new premium.

• Part B: 10% of the standard premium for each full 12 months you could have had Part B but didn't. Wait 3 years and you pay 30% extra. At 2026 rates, that's about $60.90 more every month, on top of $202.90.
• Part D: If you go 63 days or more without creditable drug coverage after your Initial Enrollment Period, you owe 1% of the national base beneficiary premium ($38.99 in 2026) for every uncovered month. Two years without coverage adds roughly $9.40 a month, and it rises as the base premium rises.
• Part A (only if you'd pay a premium): 10% extra, for twice the number of years you delayed.

Missing the window is one of the common Medicare mistakes first-time enrollees make. Miss it and you can only sign up during the General Enrollment Period, January 1 through March 31, with coverage starting the month after. That can leave you uninsured for months. The Part B late enrollment penalty does the most damage, simply because almost everyone pays a Part B premium for 20+ years. It's one of several Medicare penalties that never go away.

A quick decision checklist

1. Are you getting Social Security 4+ months before 65? You're enrolled automatically. Decide whether to keep Part B.
2. Not on Social Security yet? Mark your 7-month window on a calendar and apply through Social Security. Check who is eligible for Medicare if you're unsure about work credits.
3. Still working? Ask HR how many employees are on the plan and whether drug coverage is creditable. Get it in writing.
4. On COBRA, retiree, or Marketplace coverage? Sign up for Parts A and B at 65.
5. High earner? Part B and Part D cost more once income passes $109,000 single or $218,000 joint, so check whether Medicare choices could raise your tax bill.
6. Funding an HSA? Stop contributions 6 months before you apply for any part of Medicare.

If you're turning 65 soon, the rest of the sequence (cards, plan choices, Medigap timing) is in our turning 65 Medicare enrollment guide. And if your situation doesn't fit neatly into any of the boxes above, a local licensed agent in Illinois can check it against your actual coverage before you lock anything in.