What to Check Before You Delay Any Part of Medicare

Delaying Medicare can be reasonable in some situations. It is only safe after checking the specific rule that applies to your coverage — in writing, before the window closes.

Delaying Medicare is reasonable in some situations and risky in others. The difference depends on what coverage you currently have, who provides it, the employer’s size, whether the drug coverage is creditable, what your spouse’s coverage looks like, and what Social Security has on file. This checklist is the safer version of the conversation: nine things to verify before you delay Part B, Part D, or any other part of Medicare. Get the answers in writing. The penalty for getting this wrong is paid in higher Medicare premiums for the rest of your life. The verification is the work.

Delaying Medicare is not careless when it is verified. It becomes careless only when it is assumed.

The short answer

Before delaying any part of Medicare at or after 65, verify each item below — in writing, from the appropriate source.

A short version of the checklist:

1. Coverage type — active employer / retiree / COBRA / other
2. Employer size — 20+ employees or fewer
3. Whose employment — yours, your spouse’s, or a former employer’s
4. Plan coordination with Medicare — primary or secondary at 65
5. Drug coverage creditability — creditable or not
6. HSA contributions — active or stopped
7. Social Security filing status — already filing, or delayed
8. Spouse’s coverage and timing — separate or coordinated
9. Written confirmation — from each authority

The full version is below.

How this applies to you

This article is the practical checklist. If you are working through any of these specific situations:

• Still working at 65 with active employer coverage: See Still Working at 65: What to Check Before You Delay Part B.
• Active coverage ending soon: See The 8-Month Part B Special Enrollment Period.
• Wondering about Social Security timing: See Social Security and Automatic Medicare Enrollment.
• Spouse situation: See Medicare Timing for Spouses.

The full checklist

1. What is the coverage type?

Active employer group coverage from current employment is the most common reason to delay Part B. COBRA, retiree coverage, individual market plans, and Medicaid each follow different rules.

Verify:

• Active employer coverage = coverage tied to current employment (yours or your spouse’s).
• COBRA = continuation after employment ends. Not active employer coverage.
• Retiree coverage = coverage from a former employer after retirement. Not active employer coverage for Part B SEP purposes.

Where to verify: employer benefits team in writing.

2. What is the employer size?

The 20-employee threshold determines whether Medicare or the employer plan pays first at 65.

• 20+ employees: Employer plan generally pays first; Medicare is secondary. Part B can often be delayed.
• Fewer than 20 employees: Medicare generally pays first; the employer plan is secondary. Part B is usually needed at 65 even while working.

Where to verify: employer benefits team in writing; cross-check with CMS Medicare Secondary Payer.

3. Whose employment provides the coverage?

If the coverage is through your current employment, the Part B SEP is based on your employment.

If the coverage is through your spouse’s current employment, your Part B SEP may still apply — but the verification is on your spouse’s employer.

If the coverage is through a former employer (yours or your spouse’s), it is retiree coverage. Different rules.

Where to verify: each relevant employer’s benefits team.

4. How does the plan coordinate with Medicare?

Plans coordinate with Medicare based on whether they pay primary or secondary. Even within active employer coverage, some plans expect Medicare to pay first regardless of employer size — particularly self-funded plans or specific plan designs.

Where to verify: the plan’s Summary Plan Description and the plan’s Medicare coordination section, in writing.

5. Is the drug coverage creditable?

”Creditable” drug coverage means coverage that is expected to pay, on average, as much as Medicare Part D. (Medicare.gov — Part D Late Enrollment Penalty)

• If your employer or other coverage provides creditable drug coverage, you can generally delay Part D without a late enrollment penalty as long as you enroll within 63 days of losing creditable coverage.
• If the drug coverage is not creditable, you may face a Part D late enrollment penalty if you delay Part D.

Where to verify: ask the employer or plan in writing for the annual creditable coverage notice they are required to send each year. Save it.

6. Are you contributing to an HSA?

If you enroll in any part of Medicare — including premium-free Part A — HSA contributions must stop. The cutoff is the month before Medicare starts. If Part A is later backdated (because you file for Social Security after 65), HSA contributions during those backdated months become excess contributions, with IRS tax consequences. (IRS Publication 969)

Where to verify: your HSA administrator and a tax professional. See HSA and Medicare Timing for the deeper mechanics.

7. Have you filed for Social Security?

If you have filed for Social Security, you are automatically enrolled in Part A and Part B at 65. You can decline Part B, but Part A enrollment is automatic and tied to Social Security benefits.

If you have not filed, you can enroll in Medicare without filing for Social Security. This is often the path for people who want Part A but no Part B, or who want to delay both.

Where to verify: SSA.gov.

8. What is your spouse’s coverage and timing?

Even if your own coverage is straightforward, your spouse’s situation can complicate the household decision. The working-aged provision can let the older spouse delay Part B based on the younger working spouse’s coverage. Verify on both sides.

Where to verify: each spouse’s employer (if applicable), SSA, state SHIP for spousal cases.

See Medicare Timing for Spouses for the household patterns.

9. Do you have written confirmation?

Verbal answers from HR, well-intentioned advice from friends, or partial information from a broker are not enough for a permanent timing decision. Get each of the answers above in writing:

• From your employer (or spouse’s employer): coverage type, employer size, plan coordination with Medicare, creditable drug coverage notice.
• From Social Security: your Medicare eligibility and any Special Enrollment Period determination.
• From your state SHIP: if you want a free second opinion from a counselor with no financial stake in the answer.
• From your tax professional: if HSA contributions or Social Security timing affect you.

What people often get wrong

• ”My HR said I’m fine.” Sometimes accurate; sometimes not. Get it in writing.
• ”I don’t take any drugs, so Part D doesn’t matter.” Delaying Part D without creditable coverage can lead to a permanent Part D late enrollment penalty if you later need drug coverage.
• ”COBRA is just employer coverage that continues.” For paying bills, often. For Part B timing, no.
• ”I’ll figure it out when I retire.” Sometimes possible. But the 8-month Part B SEP is shorter than people think, and Medigap underwriting can be harder than people expect. Plan ahead.
• ”My state has guaranteed-issue Medigap rights, so I can wait.” Some states (NY, CT, MA, MN, WI) and some specific situations have broader Medigap protections. Most do not. Federal Medicare rules create the baseline, but Medigap availability and protections can vary by state. Verify with your state DOI or SHIP.

What to do if you have already delayed and are not sure

1. Contact Social Security to confirm your Medicare enrollment status and any SEP eligibility.
2. Contact your state SHIP for free counseling on whether you still have a window.
3. If you are inside an 8-month Part B SEP, act before it closes.
4. If you are outside any SEP, plan for the General Enrollment Period (January 1 – March 31). See The General Enrollment Period: What It Fixes and What It Does Not.

A simple timing prompt

”Have I answered all nine of the questions above, in writing, for my specific situation?”

If not, the delay is not yet a decision — it is an assumption.

Verification is the work. The verification is also the protection. Both happen on paper, in writing, before the window closes.

This is a piece of a bigger picture

This article is part of Enrollment & Timing.