INSURANCE BRIEF

Working Past Age 65

3 min read

By: Justin Tomlin – Licensed Insurance Agent (FL W960118 | GA 3760385)

What Changes When You Turn 65 at Work

Turning 65 triggers Medicare eligibility for most people. For those still working and covered through an employer, that eligibility does not always require immediate action. Whether to enroll right away — or wait — depends on how your employer plan interacts with Medicare.

The Medicare Secondary Payer rule is the key factor. At a company with 20 or more employees, an employer group health plan is generally primary — it pays first, and Medicare pays second. At a company with fewer than 20 employees, Medicare typically pays first, making Part B enrollment more important from day one.

These rules apply to active employment. Coverage through a spouse’s employer follows similar logic. Confirm your employer’s size and plan type with your benefits administrator before making any enrollment decisions.

The Four Parts of Medicare

Part A covers inpatient hospital care, skilled nursing facilities, hospice, and some home health services. Most people qualify for Part A without a monthly premium based on their own or a spouse’s work history.

Part B covers outpatient care — doctor visits, preventive services, lab work, and medical equipment. It carries a monthly premium. Enrolling in Part B while an employer plan is still primary is generally optional, but the timing affects future Medigap eligibility.

Part C, also called Medicare Advantage, is an alternative way to receive Medicare benefits. These plans are sold by private insurance companies approved by Medicare and typically bundle Parts A and B — often with additional benefits. Part C is not required at 65, and most people still working with employer coverage choose to delay it.

Part D covers prescription drugs. Part D plans are also sold by private insurance companies. Enrollment is not required at 65, but delaying without qualifying drug coverage already in place can result in a permanent late enrollment penalty.

HSA Contributions and Medicare

A Health Savings Account — commonly called an HSA — is a tax-advantaged account used to pay for eligible medical expenses. Contributions are only permitted when enrolled in a qualifying high-deductible health plan and not enrolled in any part of Medicare.

Once Part A, Part B, or both begin, HSA contributions must stop. This is true even if the employer plan is still the primary payer. Part A enrollment alone is enough to end contribution eligibility.

One important detail: enrolling in Social Security after age 65 can trigger retroactive Part A coverage going back up to six months. That retroactive enrollment can create an HSA problem even when Medicare enrollment was not the intent. Those who want to keep making HSA contributions should generally delay Social Security benefits as well.

When Employer Coverage Ends

When active employment ends or employer group coverage is lost, a Special Enrollment Period generally allows Part B enrollment without a late penalty. That window is typically eight months from the date employment or employer coverage ends, whichever comes first.

The date Part B begins also starts the Medigap Open Enrollment Period. That six-month window allows enrollment in Medicare Supplement Insurance without medical underwriting. Once it closes, health history can affect eligibility and cost. Timing the transition carefully protects future coverage options.

To learn more about delaying Part B enrollment, see Delaying Part B. Protecting Your Medigap Options →.

Official Resources for Making Decisions