Do you automatically get Medicare when you turn 65?

Only if you are already drawing Social Security or Railroad Retirement benefits at least four months before the month you turn 65. Then Medicare enrolls you in Part A and Part B and mails your card about three months before coverage begins. If you are not drawing those benefits yet, nothing happens on its own. Nobody calls, nobody enrolls you, and your seven-month window opens and closes whether or not you noticed.

That second group is now the larger one, and it is the one I meet most in north Peoria. Full retirement age is 67 for anyone born in 1960 or later, which means everyone turning 65 in 2027 was born in 1962 and most of them have sensibly not claimed Social Security yet. The couple in Vistancia who moved here from a job in another state, the Trilogy resident still consulting two days a week, the owner of a small business along Grand Avenue in 85345: for all of them, Medicare at 65 is a do-it-yourself event. And if your birthday is in January 2027, your window opened on October 1. This month.

Who gets Medicare automatically at 65

Medicare.gov puts the rule in one sentence: if you start getting benefits from Social Security or the Railroad Retirement Board at least four months before you turn 65, you get Part A and Part B automatically.

Three things follow from that.

• Both parts, not one. Automatic enrollment puts you in Part B as well as Part A, and the Part B premium starts coming out of your Social Security payment the month coverage begins. Nobody asks first. If you are still covered through a job and did not want Part B yet, you have to act, and there is a deadline, covered below.
• The welcome package is the signal. It arrives about three months before your coverage starts and contains your red, white and blue card, a welcome letter and a booklet of the decisions in front of you. If you are drawing Social Security and that package has not shown up by the start of your birthday month, call Social Security rather than assuming it is in the post.
• The same rule covers people under 65 on disability, after 24 months of Social Security Disability Insurance. Different timing, same mechanism.

People in this group have the easy version. The hard version is everyone else.

Why most people turning 65 in 2027 are not enrolled automatically

Automatic enrollment is tied to already receiving a benefit, not to your age. For decades that distinction barely mattered, because full retirement age was 65 and most people claimed Social Security and Medicare in the same month. It has drifted apart since. The retirement age reached 67 for anyone born in 1960 or later, and there is a real financial case for waiting until 67, or 70, if you can afford to.

The practical result is that the typical person turning 65 in Peoria in 2027 is not on Social Security, is not going to be enrolled in anything, and is getting a mailbox full of envelopes that look official and are not. Medicare does not send marketing. Medicare does not call. What it does is open a seven-month window around your birthday month, and then close it, silently.

If you were born on the first of a month, note that every date in this article shifts a month earlier for you. Medicare treats a first-of-the-month birthday as if you turned 65 the month before.

Enrolled automatically but still working? How to decline Part B

This is the group that gets hurt by automatic enrollment rather than helped by it. You claimed Social Security early, you are still on a group plan through your own or your spouse’s current employer, and a Medicare card arrives with Part B already attached and a premium about to start.

The welcome package tells you what to do, but it is easy to miss. On the back of the form the card is attached to, there is a box that reads “I DON’T want Medicare Part B (Medical Insurance)”. Check it, write down your Medicare number first, and return the whole form, card included, in the envelope provided before your coverage begins. If you keep the card, you have agreed to Part B and the premium.

Before you check that box, be sure you are allowed to. Declining Part B is only safe when the coverage comes from current employment at an employer with 20 or more employees. Retiree coverage, COBRA, and coverage from a company with fewer than 20 employees do not protect you. I went through the whole test, and the small-business trap that catches owner-operators in the older part of Peoria, in Do I need to sign up for Medicare at 65 if I’m still working? Read that one before you send anything back.

How to sign up if nothing happens on its own

You sign up through Social Security, not through Medicare, and not through any plan or company. The routes:

1. Online at ssa.gov. The fastest way by a wide margin, and you can file up to three months before the month you turn 65. There is a “Medicare only” application for people who are not ready to claim retirement benefits, so applying for Medicare does not start your Social Security.
2. By phone with Social Security, or in person at a local office by appointment. The Phoenix-area offices book out, so if that is your preference, call ahead rather than walking in.
3. Part A only, Part B later. If you are keeping group coverage from a current employer, you can take premium-free Part A now and add Part B when the job coverage ends. One caution: any Medicare enrollment, Part A included, ends your ability to contribute to a Health Savings Account, and Part A can be backdated up to six months when you enroll late. If there is an HSA in the picture, read Can I contribute to an HSA while on Medicare? first.

Have your Social Security number, your date and place of birth, and proof of citizenship or lawful residence if Social Security does not already have it on file. If you are adding Part B after delaying it, your employer will need to complete form CMS-L564 to prove you had qualifying coverage. That form is what keeps the late enrollment penalty off.

Your card is mailed once the application is processed. If your birthday is in January and you want coverage on January 1, file in October or November rather than in December, so the card is in hand before you need it.

When your coverage starts, by birthday month

Coverage always starts on the first of a month. When it starts depends on when inside the window you sign up.

Source: Medicare.gov, "When does Medicare coverage start?" Sign up in the three months before your birthday month and coverage starts the first of that month. Sign up in your birthday month or the three months after and it starts the first of the following month. A birthday on the first of the month moves every date here one month earlier.

The row that matters is the third column. Waiting until your birthday month does not cost you a penalty, but it does cost you a month of coverage, and if you are leaving an employer plan on the last day of the month before, that gap is real. The enrollment timeline tool builds this table for your own birthday in about a minute, including the two windows below that most people never hear about.

The six-month window that starts with Part B

Here is the part that the welcome package underplays and the marketing mail never mentions at all.

The day your Part B starts, a second clock begins: a six-month Medigap open enrollment period that starts the first day of the month you are both 65 and enrolled in Part B. Inside it, you can buy any Medicare Supplement sold in Arizona with no health questions. After it, Medicare.gov’s own wording is that your options “may be limited and the policy may cost more”. In practice, Arizona carriers can medically underwrite you, and Arizona has no birthday rule to give you a yearly do-over the way a handful of other states do.

For a good share of north Peoria, this is the decision that outlasts every other one. Trilogy at Vistancia and Westbrook Village are full of households that spend part of the year somewhere else, and a Supplement works with any provider in the country who takes Medicare, which turns four months away into a non-event. Households that stay put and want the lower monthly outlay of a Medicare Advantage plan need the network checked against the Arrowhead and Sun City practices they actually use, because that is where north Peoria goes for specialist care regardless of the city on the mailbox. Medicare Advantage vs. Medigap sets out both routes, and Plan G vs. Plan N covers the two Supplements most people in that window end up choosing between.

Whichever way you lean, the comparison belongs inside the six months, not after. There is no penalty for missing it. There is just a door that closes.

The Part D clock runs at the same time

Drug coverage is not automatic for anyone. Even people enrolled in Part A and Part B on their own have to choose a stand-alone Part D plan or a Medicare Advantage plan that includes drugs, and the window is the same seven months.

Go 63 days or more past the end of that window without creditable drug coverage and a penalty attaches to your drug premium for as long as you have Part D. That holds even if you take nothing today, which is why Do I need Part D if I don’t take prescriptions? exists. For 2026, out-of-pocket spending on covered drugs is capped at $2,100, and the cap resets with the plan year.

What it costs, and the income question nobody expects

Retirement is a recognized life-changing event, and Form SSA-44 lets you ask Social Security to use your current income instead. Do that one with your tax advisor rather than guessing. How do I appeal IRMAA after retirement? walks through the form, and the IRMAA estimator shows where your income lands first.

What to do this month if you turn 65 in early 2027

1. Decide which group you are in. Drawing Social Security four months before your birthday month means a package is coming and Part B is attached to it. Not drawing it means nothing is coming and the application is yours to file.
2. Put three dates on a calendar: the first day of your seven-month window, the last day of the month before your birthday month (the sign-up deadline for first-of-the-month coverage), and the end of the six-month Medigap window after Part B starts. The timeline tool does the arithmetic.
3. If you are still working, ask your benefits administrator two questions in writing: how many employees does the plan count, and is the drug coverage creditable. The answers decide whether you take Part B now, take Part A only, or decline Part B on the card you were sent.
4. If there is an HSA, stop contributions early enough to clear the six-month Part A look-back.
5. File early in the window, not in your birthday month. Online at ssa.gov if you can.
6. Use the Medigap window while it is open. Supplement or Advantage is a decision that takes an hour with your doctor list and your prescriptions in front of you, and in Arizona it is far easier to make at 65 than at 66.

If you would rather have somebody lay the dates out with you, that is a short call and it does not require you to be ready to buy anything. Book a Turning-65 planning call, or call (602) 844-6002. I am independent, the office is in Anthem, roughly 25 minutes from north Peoria out the Carefree Highway and down Lake Pleasant Parkway, and most Turning-65 conversations happen by phone anyway. The Peoria service-area page has the local detail, and the evergreen version of the two windows is in Turning 65: the window that matters, and the one that never comes back.