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When Should I Enroll In Medicare?

David Hicks

Everyone is eligible for Medicare at 65, but because people going onto Medicare are usually coming off of an employer’s insurance—and sometimes even keeping that other insurance—it can be complicated. 

Like it or not (and most employers do not), health insurance in this country is employment-related. Most employers offer health insurance as a tax-free employee benefit, and most working people get their health insurance through their work. Although plan options and pricing might vary from year to year, workers who get their health insurance through their employers can feel confident that if something goes wrong with their health, they and their family will be covered up to the limits of the plan.

Two things can happen to disrupt this comfortable, predictable arrangement. One is leaving employment. The other is turning 65.

People who leave employment, whether they are switching jobs or retiring for good, will need to line up new insurance so it is set to start when the former plan ends. The type of insurance they will line up will depend on whether they are under or over age 65 when they leave the job.

A person who is under 65 may take advantage of COBRA, which allows them to stay on the same plan for up to 18 months at their own expense. This keeps them covered while they look for a new job or qualify for Medicare at 65. Or, if they are retiring for good, they may have access to a retiree plan through their former employer. Or they may go on a spouse’s employer plan. If none of these options are available, they may buy individual health insurance through the marketplace.

If a person is over 65 when they leave employment, they will typically go onto Medicare. Medicare is the health insurance system for individuals age 65 and older in this country. For anyone 65 and older who is enrolled in Medicare, Medicare pays primary. If there is other insurance, such as COBRA or a retiree plan, Medicare would pay first and the other insurance would pay second.

If a person is still working when they turn 65, they can stay on the employer plan. But if the plan covers fewer than 20 employees, Medicare would pay primary. This means anyone over 65 who is covered by an under-20 plan must enroll in Medicare to get their medical bills paid. Medicare would pay first, and the employer plan would pay second. If the employer plan covers 20 or more employees, it’s the opposite: the plan would pay first and Medicare would pay second. If the person is not enrolled in Medicare, Medicare would not pay. Any gaps left by the employer coverage, such as deductibles or copayments, would be paid by the employee.

This review of the Medicare enrollment rules all sounds very straightforward. But because people going onto Medicare are usually coming off of other insurance—and sometimes even keeping that other insurance—it can be complicated. So we’ll break it down into three categories: when a person can, should or must enroll in Medicare.

Who CAN enroll in Medicare

Any U.S. citizen or legal resident of the U.S. who is 65 or older can enroll in Medicare. Part A is free if they have paid into Medicare for at least 10 years. If not, there will be a premium for Part A. Everyone pays a premium for Part B. Anyone who has either Part A or Part B (or usually both) can enroll in Part D.

Who SHOULD enroll in Medicare

Anyone who is eligible for Medicare (65 or older) whose current insurance is not as good as Medicare should enroll in Medicare. For example, let’s say you are 65, still working and covered by a plan that covers 20 or more employees. But the plan isn’t very good. It has a high deductible and would cost you lot of money out-of-pocket if he were to get sick.

Or maybe it’s a good plan, but the employee’s share of the premiums is high. Or maybe it has a narrow network of doctors and the client isn’t able to see a particular specialist. Or maybe you have developed a medical condition and is now incurring high medical bills.

Employer plans—especially high deductible plans paired with an HSA—are really designed for healthy people who want to be covered in case something goes wrong. Medicare is designed for older people who tend to need more medical services. So if you have a worsening health condition might mean you should enroll in Medicare, even though you don’t have to because you’re covered by an over-20 plan.

Who MUST enroll in Medicare

Anyone age 65 or older who is not covered by an employer plan that covers 20 or more employees based on active employment must enroll in Medicare. That is, they must enroll in Medicare if they want to have their medical bills covered. Any plan that does not cover 20 or more, including COBRA, retiree plans, and small (under 20) group health plans pay secondary to Medicare. If a bill gets submitted to them, these plans will not pay until Medicare has paid its share. But if the patient is not enrolled in Medicare, Medicare won’t pay. And neither will the secondary health plan.

Some of the small group insurers have created confusion by volunteering to pay in the absence of Medicare. If you stay on your small group health plan for years after turning 65, not realizing that your coverage was somewhat tenuous because it could be revoked at any time.

The other reason we recommend that you must enroll in Medicare, in addition to getting their medical bills paid, is to avoid late-enrollment penalties. Now, this can be a source of confusion too, because Medicare says you just need to be covered by an employer group plan (of any size) to have a special enrollment period. So a person could stay on their under-20 group plan for three years after turning 65. When they go to enroll in Medicare they’ll be asked if they’ve been covered by a group plan. They’ll say yes, and there will be no penalties.

So yes, it’s conceivable that you could stay on your under-20 group plan after age 65 without enrolling in Medicare, get your bills paid (thanks to a generous insurer who paid without being required to do so), and not get charged a late-enrollment penalty because you’ve had continuous group coverage. However, if you remain covered by an under-20 group plan after age 65 without enrolling in Medicare is taking a risk—a risk that the plan won’t pay and that Medicare will charge you a late-enrollment penalty. The fact that insurers and Medicare sometimes bend the rules doesn’t mean you should count on it.

What about mandatory enrollment in Part A?

The preceding discussion primarily relates to Part B. Because Part B carries a premium, and because it’s possible to delay or decline Part B, that’s where most of the confusion lies. But you do need to know that when you start Social Security, as you will be automatically enrolled in Part A if you are 65 or older.

Usually, this is not a problem. Part A is generally free and offers good hospitalization coverage. It’s only a problem if your health plan is an HSA, as there can be no further contributions to the HSA after enrolling in Medicare. If your employer offers a high-deductible health plan, but who can’t use the contributions designed to cover the deductible, you would probably be better off leaving the health plan and going fully onto Medicare.

But before you consider that, if you’re married, consider your spouse’s coverage. If you to stay on the employer plan in order for your spouse to be covered, some combination of Medicare (i.e., Part A if receiving Social Security) and the employer plan (with no HSA contributions for the client on Medicare) may be the only solution.

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