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COBRA vs Medicare: Avoid Penalties With Eight Months to Enroll

Compare 2026 COBRA and Medicare costs, learn why Medicare usually pays first, and use the eight months for Part B enrollment to avoid coverage gaps.

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COBRA vs Medicare: Avoid Penalties With Eight Months to Enroll

Older adult comparing health coverage enrollment packets

You can hold both, but Medicare is generally the primary payer and COBRA pays second. COBRA also does not extend your Medicare Part B enrollment window, which the Department of Labor says is 8 months. With the 2026 Part B premium at $202.90, timing matters.

TL;DR:

  • Your eight month Part B enrollment period starts after employment or job based coverage ends, whichever comes first, and electing COBRA does not pause it.
  • Missing the Part B window can leave you without coverage until the General Enrollment Period and trigger a lifetime late enrollment penalty.
  • For 2026, Part B costs $202.90 monthly plus a $283 annual deductible, while COBRA can cost up to 102% of the full plan premium.
  • Check your Summary Plan Description and ask the administrator in writing whether claims treat Medicare as primary even if you have not enrolled.
  • Enrolling in Medicare may end COBRA for you, though eligible family members may keep coverage; confirm the terms with your plan administrator.
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Table of Contents

How do Medicare and COBRA work together?

The general rule is simple: for most people 65 or older, Medicare pays first and COBRA pays second. If you are eligible for Medicare but not fully enrolled, COBRA may cover only a small portion of your care, and you may owe most of the cost yourself.

A few details change how this plays out:

  • End-stage renal disease (ESRD): a coordination period of up to 30 months applies in some cases, so the payer order can differ for people with ESRD. Check Medicare’s guidance for your situation.
  • Your plan’s wording: the Summary Plan Description (SPD) may treat Medicare as primary even if you have not enrolled, which can lead to denied claims. The Department of Labor’s COBRA FAQs point to the SPD as the first place to look.
  • Enrolling while on COBRA: signing up for Medicare can end COBRA for the person who enrolls, while other family members on COBRA may keep theirs. Confirm this with your plan administrator before changing anything.

What does each option cost in 2026?

Medicare has set prices, while COBRA depends on your former employer’s plan. That makes a side-by-side comparison worth doing before you commit.

The 2026 standard Part B premium is $202.90 per month, with a $283 annual deductible. COBRA premiums can reach 102% of the full plan cost, so keeping COBRA can cost far more than Part B alone.

Here is what to weigh:

  • COBRA: you typically pay the whole premium, including the share your employer used to cover, plus the 2% administrative charge. Some disability extensions allow more.
  • Medicare: Part B plus a Medicare Advantage plan or a Medigap policy, plus a Part D drug plan if you need one.
  • Drug coverage: whether your current drug coverage counts as creditable affects your Part D enrollment windows and potential penalties.

Many people pay a high COBRA premium for secondary coverage that adds little. Add up the real monthly total for each route before deciding.

When do you have to enroll in Medicare?

Your Part B Special Enrollment Period (SEP) lasts 8 months. It begins the month after your employment ends or the month your job-based coverage ends, whichever comes first. COBRA is not treated as current employment coverage, so electing it does not pause the clock.

  1. Note when your employment or job-based coverage ends.
  2. Your 8-month Special Enrollment Period begins the following month, or the month after your job-based coverage ends, whichever comes first. Check the Department of Labor’s guidance for your enrollment deadline.
  3. Sign up during the SEP so your coverage starts without a gap.
  4. If you miss the window, expect a gap until the General Enrollment Period and a lifetime Part B late enrollment penalty.
  5. Decide whether the enrolling spouse or dependents will keep COBRA, since rules for other beneficiaries differ.

If you enroll in Medicare before COBRA begins, you simply move forward on Medicare. If COBRA is already running, enrolling may end it for you. For more on how the periods fit together, see our primer on Medicare enrollment periods.

What should you do now to avoid gaps?

Work through these steps in order:

  • Read your SPD for coordination-of-benefits language, then ask the plan administrator how claims are processed if you are not enrolled in Medicare.
  • Call a local State Health Insurance Assistance Program (SHIP) counselor, who offers unbiased help comparing options and enrolling.
  • Start Medicare enrollment before your SEP runs out, and write down every date.
  • Compare your COBRA premium against Part B plus Medicare Advantage or Medigap plus Part D.
  • Keep proof of COBRA election dates, Medicare notices and correspondence in case you need to appeal a claim.

Pro Tip: Ask your plan administrator in writing how claims will be paid if you delay Part B, and save the reply.

How can we help you decide?

How can we help you decide? — overview diagram

We are a Medicare agency in Rockford, Illinois, and we can help sort out COBRA against Medicare. Our team offers new-to-Medicare guidance, side-by-side comparisons of Medicare Advantage and Supplement plans, Part D prescription reviews and hands-on enrollment support. We put your COBRA premium next to what Medicare would really cost you, so you can see the difference in plain numbers.

A one-on-one conversation can also clarify how your specific employer plan coordinates with Medicare and help you enroll on time to avoid Part B penalties. To get started, schedule enrollment support or a plan comparison with us.

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This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.

FAQ

Is it better to choose COBRA or Medicare?

It depends on your costs and timing, but COBRA is often more expensive because you pay the full plan premium. Medicare enrollment deadlines do not wait for COBRA, so compare your total monthly cost for each route before you decide.

Can I go on COBRA if I am over 65?

Yes, COBRA can be available if you lose job-based coverage after 65. Remember that Medicare is usually primary, so COBRA may pay little if you skip Medicare enrollment.

Who pays first, Medicare or COBRA?

For most people 65 or older, Medicare pays first and COBRA pays second. Exceptions exist, such as the ESRD coordination period, so check your situation.

Can my wife stay on COBRA if I go on Medicare?

Often yes, but it depends on your plan’s terms. Enrolling in Medicare can end COBRA for the person who enrolls, while other family members may keep theirs. Ask your plan administrator to confirm before you switch.

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This article is general information, not an insurance application or coverage decision. Check current official guidance and plan documents for your own situation.

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