Working Past 65: Medicare, Part B, COBRA, and HSA Questions

Working after 65 does not create one Medicare answer for everyone. Current-employment coverage, COBRA, retiree insurance, drug coverage, and HSA timing can follow different rules.

Start with the source of your coverage

Write down which description actually fits:

• group health coverage from your current job;
• group health coverage from your spouse's current job;
• COBRA after employment ended;
• retiree coverage from a former employer;
• Marketplace or other individual coverage;
• Medicaid, VA, TRICARE, or another government program.

These labels are not interchangeable. Medicare's official guidance says people covered through current employment may be able to wait to enroll in Part B, while coverage that is not based on current employment can follow different rules.

The safest starting point is Medicare.gov's current Working past 65 guide and its interactive When can I sign up? tool.

The Part B Special Enrollment Period is limited

Medicare says that when current employment or qualifying job-based coverage ends, an eight-month Special Enrollment Period may be available for Part B. The period starts when the employment ends or the coverage ends, whichever happens first.

That does not mean waiting eight months is always harmless. A delayed application can create a coverage gap. Medicare advises checking when employer coverage ends and applying early enough for Medicare to begin when it is needed.

COBRA can solve one problem and create another if the timing is misunderstood

COBRA may temporarily continue employer coverage after a job ends, but Medicare and COBRA have separate enrollment and coordination rules.

Medicare's current guidance says:

• if you have COBRA and have not yet enrolled in Medicare, you should not assume COBRA lets you wait until it ends before enrolling in Part B;
• COBRA will probably end when you enroll in Medicare if the COBRA coverage began first;
• when COBRA begins after Medicare, COBRA generally pays after Medicare, with limited exceptions.

Because the answer can depend on timing and the type of coverage, confirm it with the COBRA administrator and Medicare before making a change.

HSA contributions need an earlier calendar check

You cannot contribute to a Health Savings Account after Medicare coverage begins. Money already in the HSA can still be used for qualified expenses, but new contributions after Medicare starts may cause tax consequences.

This deserves attention before applying for Medicare or Social Security. Medicare tells people with an HSA to stop contributions six months before retiring or applying for Social Security or Railroad Retirement Board benefits. Social Security also explains that, for someone applying after 65, premium-free Part A can begin up to six months before the application month, but not before the first month of Medicare eligibility.

The practical issue is retroactivity: the date Medicare coverage begins may be earlier than the date the application is filed. Review the intended Medicare application date, HSA contributions, and tax treatment with the employer and a qualified tax professional before acting.

Drug coverage has its own test

Part B timing and Part D timing are separate questions. If you are keeping job-based prescription coverage, ask the plan whether the coverage is creditable prescription drug coverage and keep the annual notice it sends.

Medicare says people with creditable drug coverage can generally delay Part D without a penalty, but a period of 63 days or more in a row without Medicare drug coverage or other creditable coverage can trigger a Part D late-enrollment penalty. Verify the exact dates rather than assuming medical coverage and drug coverage have the same status.

Questions to ask the benefits administrator

Ask for written answers when possible:

1. Is this coverage based on my current employment or my spouse's current employment?
2. Is it an employer group health plan for Medicare enrollment purposes?
3. After I become eligible for Medicare, which coverage pays first?
4. Do I need Part A and Part B for the employer plan to pay correctly?
5. On what date will employment and coverage end?
6. Is the prescription coverage creditable for Part D?
7. Will enrolling in another Medicare option cause me or a family member to lose retiree or employer coverage?
8. If I have an HSA, what is the last contribution month that fits my intended Medicare application date?

A safer order of operations

1. Identify the exact source of your current coverage.
2. Use Medicare.gov's enrollment questionnaire for that coverage type.
3. Ask the employer or plan administrator the coordination questions above.
4. Put employment-end, coverage-end, HSA-contribution, and Medicare-application dates on one calendar.
5. Keep creditable drug coverage notices and written benefits answers.
6. Apply early enough to avoid a gap; do not wait for COBRA to expire before checking Part B.

Keep the dates on one page

If you are approaching Medicare eligibility, the free Turning 65 Medicare Checklist gives you a printable place to record the dates and questions that need confirmation.

What this guide cannot decide

This page provides general education. It cannot determine whether you personally should delay Part A or Part B. The answer can depend on current-employment coverage, employer and plan rules, HSA timing, disability or ESRD eligibility, prescription coverage, and other facts. Confirm your situation through Medicare, Social Security, the employer benefits administrator, and a qualified tax professional when HSA taxes are involved.