COBRA AND MEDICARE
COBRA and Medicare: Can COBRA Let You Delay Part B?
COBRA does not let you postpone Medicare indefinitely. The Part B Special Enrollment Period generally begins when active employment or the job-based coverage ends—even if COBRA continues for many more months.
COBRA is continuation coverage after employment or dependent coverage ends. It is not group health coverage based on current employment for Medicare Part B SEP purposes.
If you are 65 or older and delayed Part B because of qualifying current-employment coverage, you generally have up to eight months after the employment or that active group coverage ends, whichever happens first, to enroll without a Part B late penalty. Electing COBRA does not restart or extend that clock.
Before using this guide, confirm that your original decision to delay Medicare was valid in Can I Delay Medicare If I’m Still Working Past 65?.
THE CENTRAL RULE
Why Doesn’t COBRA Protect the Part B SEP?
The working-aged Part B SEP is tied to group health plan coverage based on your or your spouse’s current employment. COBRA begins after a qualifying event such as termination of employment, reduction in hours or loss of dependent coverage.
| Question | Active-employment group coverage | COBRA continuation coverage |
|---|---|---|
| Based on current employment? | Yes | No |
| Can support the working-aged Part B SEP? | Generally, when all requirements are met | No; COBRA does not extend that SEP |
| May continue after the job ends? | Only as the plan allows | Generally 18 months; 36 months in certain events |
| Does Medicare usually pay first after retirement? | Depends on active employment and plan coordination | Medicare generally pays before COBRA, except some ESRD situations |
COBRA may remain useful for a younger spouse, dental or vision coverage, or benefits that Medicare does not replace. It is still not a reason to ignore the Medicare enrollment deadline.
THE EIGHT-MONTH CLOCK
When Does the Part B SEP Begin?
The SEP generally runs while qualifying current-employment coverage continues and for eight months after the employment or active group coverage ends, whichever occurs first.
Example: If employment and active coverage end December 31 and COBRA begins January 1, the Part B SEP generally begins with the loss of active employment coverage—not when COBRA ends 18 months later.
If the SEP is missed, enrollment may be limited to the January 1–March 31 General Enrollment Period, coverage generally begins the month after enrollment and a lifetime Part B late-enrollment penalty may apply.
The cleaner approach is to coordinate the Medicare start before active coverage ends. See Retiring After 65: How to Switch From Employer Coverage to Medicare.
WHO PAYS FIRST
Can COBRA Leave You With Unexpected Medical Bills?
Yes. Medicare warns that COBRA may pay only a small portion of claims when a person is Medicare-eligible but not enrolled. The COBRA plan may calculate its payment as though Medicare paid first, leaving the beneficiary responsible for the unpaid amount.
Ask the COBRA administrator in writing:
- Does the plan expect Medicare to pay first?
- What happens to claims if I am eligible but not enrolled?
- Will my COBRA end when Medicare begins?
- Can my spouse or dependents continue after I enroll?
- Is the prescription coverage creditable for Part D?
- Can I elect only dental or vision coverage?
WHICH CAME FIRST?
Does It Matter Whether Medicare or COBRA Starts First?
COBRA Starts Before Medicare
When you later enroll in Medicare, COBRA coverage for you will probably end. Ask how dental, vision and dependent coverage are affected.
Medicare Starts Before COBRA
You may still be able to elect COBRA after a later qualifying event if the plan permits it. Medicare generally pays first and COBRA pays after Medicare.
Spouse or Dependents
Family members may have their own COBRA rights and, in certain situations, longer continuation periods. The plan administrator must confirm the exact duration.
Federal COBRA generally applies to employers with at least 20 employees. State continuation laws may apply in some situations involving smaller employers, but state continuation coverage also does not automatically create a Medicare Part B SEP based on current employment.
DRUG COVERAGE
COBRA’s Medical and Prescription Rules Are Separate
Ask whether the COBRA prescription coverage is creditable for Medicare Part D. Keep the creditable-coverage notice. A continuous period of 63 days or more without Part D or other creditable drug coverage can create a Part D late-enrollment penalty.
When employer or union coverage—including COBRA—ends, the chance to join Medicare Advantage or Part D generally lasts for two full months after the month the coverage ends. Do not confuse that private-plan SEP with the separate eight-month Part B SEP.
THE FAMILY DECISION
COBRA May Be More Important for Your Spouse Than for You
A Medicare-eligible retiree may move to Medicare while a younger spouse remains on COBRA temporarily. Compare COBRA with the spouse’s own employer plan, Marketplace coverage, retiree coverage and Medicaid eligibility.
Read What Happens to Your Spouse’s Health Insurance When You Retire and Start Medicare? before making one household-wide decision.
BEFORE ELECTING COBRA
A COBRA-and-Medicare Checklist
- Record the final date of current employment and active group coverage.
- Calculate the Part B SEP from those dates—not from the future COBRA end date.
- Ask whether Medicare must pay first and how claims are handled without Part B.
- Confirm whether your COBRA ends when Medicare begins.
- Verify separate COBRA rights for a spouse and dependents.
- Obtain the Part D creditable-coverage notice.
- Compare the total COBRA premium with Medicare and household alternatives.
COMMON QUESTIONS
COBRA and Medicare FAQ
Can I wait until COBRA ends to enroll in Part B?
Usually not without risk. COBRA does not extend the Part B SEP based on current employment. The eight-month clock generally begins when employment or active group coverage ends.
Does Medicare pay before COBRA?
Generally, yes, after active employment ends. ESRD coordination can follow different rules. Confirm payer order with the plan.
Will COBRA end when I enroll in Medicare?
If COBRA began before Medicare, your COBRA will probably end when Medicare begins. Dependent coverage may have separate continuation rights.
Can I keep COBRA only for dental and vision?
Some plans permit separate elections, while others bundle benefits. Ask the plan administrator what can be elected independently.
Can I use HSA money to pay COBRA premiums?
IRS rules list health care continuation coverage such as COBRA as an exception that can qualify for HSA payment. See the separate Medicare and HSA guide and consult a tax professional.
WORKING PAST 65 SERIES
Continue the Retirement-to-Medicare Series
These guides divide one complicated transition into separate decisions about delaying Medicare, retiring, HSA contributions, COBRA and a spouse’s coverage.
OFFICIAL INFORMATION
Official COBRA and Medicare resources
DON’T LET COBRA SET THE WRONG CLOCK
Check Medicare Timing Before Electing COBRA
Thompson Medicare Brokerage helps Missouri and Illinois beneficiaries compare the Medicare Advantage, Medicare Supplement and Part D choices that may replace or coordinate with employer coverage after retirement.
The employer plan administrator determines COBRA rights and plan payment rules. Social Security determines Part B SEP eligibility and effective dates.
Thompson Medicare Brokerage is not connected with or endorsed by the U.S. government or the federal Medicare program. This article provides general educational information and is not legal advice. COBRA rights, continuation periods, payer order and enrollment eligibility depend on individual facts and plan terms.