First, find out whether anything happens automatically
If you are already drawing Social Security when you turn 65, Medicare Parts A and B start on their own and the card shows up in the mail. You do not have to do anything to get enrolled, though you still have decisions to make about drug coverage and supplemental coverage.
If you have not claimed Social Security yet, nothing happens automatically. No card arrives. Nobody calls. This catches more people every year, because delaying Social Security to full retirement age or to 70 has become ordinary advice, and a lot of people assume the two programs are linked. They are not. You sign up for Medicare through Social Security, online or at the Little Rock field office, and if you do not, you are simply not enrolled.
The seven months
Your Initial Enrollment Period covers the three months before the month you turn 65, your birthday month, and the three months after. Turn 65 in June and it runs March 1 through September 30. Turn 65 in October and it runs July 1 through January 31.
The halves of that window are not equivalent, and this is where the calendar quietly punishes people who wait.
| If you sign up | Part B coverage starts |
|---|---|
| In any of the 3 months before your birthday month | The month you turn 65 |
| During your birthday month, or in any of the 3 months after | The following month |
Enroll early and coverage is waiting for you on the first of your birthday month. Wait until the back half and every month of delay is a month of delayed coverage. If your employer plan ends on your birthday and you signed up during your birthday month, you have a gap. Sign up in the first three months. There is no benefit to waiting and there is a straightforward cost.
Still working? This is the decision that actually matters
The most common question at 65 is whether to take Part B while still covered at work. The answer turns on one fact that has nothing to do with how good your plan is: how many people your employer has.
Twenty or more employees. Your group plan stays the primary payer. You can delay Part B, keep paying nothing extra, and pick it up later through a Special Enrollment Period with no penalty. If you are turning 65 and still working at a company this size with coverage you are happy with, you usually should not enroll in Part B yet. Take premium-free Part A if you are not contributing to an HSA, skip Part B, and revisit it when you retire.
Fewer than twenty employees. The arithmetic reverses completely. Medicare becomes the primary payer at 65 whether or not you enrolled, and your group plan pays second. Skip Part B here and the group plan pays its secondary share of a bill Medicare was supposed to pay first, which leaves the balance with you. On a hospital admission that is a five-figure problem. Small employers in Arkansas are the rule rather than the exception, so do not assume: ask your benefits administrator for the employee count in writing.
COBRA and retiree coverage do not count as current employer coverage. Neither one protects you from the Part B late penalty and neither one gives you a Special Enrollment Period. People retire, elect COBRA for eighteen months, and arrive at Medicare with a penalty they did not know they were accruing. If you are retiring at or after 65, enroll in Part B at retirement rather than after COBRA runs out.
The HSA deadline nobody mentions
If you are contributing to a Health Savings Account, Medicare ends that. You cannot contribute to an HSA in any month you have Medicare, including Part A alone.
The trap is retroactivity. When you enroll in Part A after 65, Medicare can backdate it up to six months. Contributions you made during those backdated months become excess contributions and get taxed, and people find out at tax time. If you are planning to enroll, stop HSA contributions six months before the month your Medicare starts and tell your payroll department to stop the deduction. Money already in the account is unaffected, keeps growing, and can be spent tax-free on qualified expenses including your Medicare premiums.
Your one Medigap window, and why Arkansas makes it count
Enrolling in Part B starts a six-month clock. During those six months, any Medicare Supplement carrier has to sell you any policy it offers at its standard rate no matter what your medical history looks like. No health questions that can be held against you, no declines.
In roughly a dozen states you get an annual do-over through a birthday rule or an anniversary window. Arkansas gives you none of that. Once your six months are gone, a Medigap carrier here can underwrite you and say no, and the only reliable ways back in are narrow guaranteed issue situations such as involuntarily losing employer coverage. That makes the choice you make in these six months substantially harder to reverse than it would be in Oregon or California.
Arkansas does hand you one genuine advantage. The state requires Medigap policies to be community rated, so your premium is not pegged to your age and does not rise every year just because you got older. Premiums move when the carrier raises rates across its whole Arkansas block. Ask any agent for a carrier's rate increase history over the last five years before you sign, because that history predicts your future premium far better than the number on the quote.
Advantage or Supplement
Sitting behind the paperwork is one real decision: an all-in-one Medicare Advantage plan with a network and copays, or Original Medicare with a Medicare Supplement and a standalone drug plan.
The honest version is that it depends on how much healthcare you use and how attached you are to specific doctors. Advantage plans carry low premiums and shift cost into copays, which works well if you are healthy and stay in network. Supplements cost more every month and then cost almost nothing when you are actually sick, which works well if you have a chronic condition, travel, or want to keep seeing a specialist at UAMS without checking a directory first. Neither is the right answer for everyone, and anyone who tells you otherwise is selling one of them. What is worth weighting heavily at 65, specifically in this state, is that the Supplement door is easy to walk through now and hard to reopen later.
Take Part D even if your medicine cabinet is empty
Plenty of healthy 65-year-olds skip drug coverage because they take nothing. The penalty for that is 1% of the national base beneficiary premium for each month you went without creditable coverage, and it is added to your premium permanently once you do enroll. Go eight years without it and you are carrying nearly a full extra premium for the rest of your life on a plan you now need.
A minimal drug plan costs less than the penalty and protects you from the medication you have not been prescribed yet. If you have creditable drug coverage through an employer, keep the letter that says so, because that is what Medicare will ask for.
A workable countdown
- Six months out. Stop HSA contributions if you are enrolling. Ask your benefits administrator, in writing, how many employees the company has.
- Four months out. Decide whether you are delaying Part B. If you are not, this is when to compare Advantage against a Supplement while your Medigap window is still ahead of you.
- Three months out. Enroll through Social Security so coverage begins on the first of your birthday month. Gather your medication list with dosages.
- Two months out. Choose drug coverage, priced against your actual prescriptions rather than against the premium.
- Birthday month. Confirm your card arrived and that your doctors show as participating for the plan you chose.
If you are inside three months of your birthday and none of this is done, it is still fine. It is just tighter. Lancaster Cook is AHIP certified and licensed in Arkansas, license #8021079, and walks people through this every week at no cost.