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Last updated: 21 September 2026
If a former employer, union, or COBRA plan is ending, first identify what coverage ends and on what date. Medicare deadlines may already be running, and a younger spouse or dependent may need a different replacement plan.
Bottom Line
If you are 65 or older and delayed Medicare Part B because of active job-based coverage, check when current employment or that coverage ended. The Part B Special Enrollment Period can last up to 8 months after the job or qualifying coverage ends, whichever happens first. Retiree coverage and COBRA do not start a new 8-month Part B window. Drug coverage follows different rules, so also confirm the last day it is creditable.
Call the former employer or union plan, check Part B with Social Security if it is missing, and use free SHIP counseling before canceling anything.
Act Now if Coverage Ends Soon
- Write down every end date. Medical, prescription, dental, vision, spouse, and dependent coverage may end on different dates.
- If Part B is missing, check it first. Use Social Security’s Part B sign-up page and give the date active employer coverage ended.
- Ask for drug proof. Medicare says going 63 days or more in a row without Medicare drug coverage or other creditable drug coverage can lead to a Part D late-enrollment penalty. Keep the written creditable-coverage notice.
- Do not cancel old coverage early. Confirm the new start date, first premium, and any enrollment approval before ending a plan you can still use.
Start Here
- Classify the old coverage: current-employment plan, retiree plan, union retiree plan, or COBRA.
- Check Medicare status: Part A only, Parts A and B, Medicare Advantage, or no Medicare yet.
- Protect the family: ask whether a spouse or dependent has separate COBRA, Marketplace, Medicaid, or employer-plan rights.
If Medicare timing is confusing, the GFS guide to avoid Medicare penalties explains the main enrollment traps in more detail.
Quick-Reference Table
| Your situation | First action | Main risk |
|---|---|---|
| Age 65+ with Part A but no Part B | Contact Social Security about Part B. | Waiting for retiree or COBRA coverage to end may put you outside the Part B window. |
| Already have Parts A and B | Compare replacement medical and drug coverage. | Doctor networks, drug lists, and Medigap rights can limit your choices. |
| Creditable drug coverage ending | Get the exact end date in writing and choose new drug coverage. | A long uncovered period can cause a Part D penalty. |
| Spouse or dependent is under 65 | Check COBRA, Marketplace, Medicaid, or another employer plan. | The retiree’s Medicare choice does not automatically cover the family member. |
| COBRA offered | Compare its price and purpose before electing it. | COBRA can preserve coverage but usually does not protect a delayed Part B enrollment. |
What Has Changed
The core Part B rule remains in 2026: retiree coverage and COBRA are not treated like coverage based on current employment. Current Medicare guidance also says that after employer or union coverage ends, including COBRA, you generally have 2 full months after the month it ends to join a Medicare Advantage or Medicare drug plan.
This update also highlights possible Medigap rights when coverage that pays after Medicare is ending, plus Marketplace enrollment rights for qualifying family members who are not using Medicare.
First Identify What Is Ending
The plan name is not enough. Ask why you have it. Medicare treats coverage tied to current employment differently from retiree insurance based on past work. Medicare’s working past 65 guidance says the Part B Special Enrollment Period starts when the job or qualifying employer coverage ends, whichever happens first.
Retiree coverage usually comes from a former employer or union. Medicare’s retiree insurance guidance says Medicare generally pays first once you are retired and the retiree plan pays second. A retiree plan may pay little or nothing for services if its rules required you to enroll in Medicare first.
COBRA is continuation of an employer plan after a job or another qualifying event. It can be valuable, but Medicare’s COBRA Medicare guidance says COBRA is not coverage based on current employment for the Part B enrollment rule.
Practical step: make one timeline with the last day worked, last day of active job coverage, date retiree coverage started, COBRA date if any, and last day of creditable drug coverage. Use dates from written notices rather than memory.
Protect the Medicare Part B Deadline
This is usually the highest-risk issue. If you had qualifying employer group health coverage through your current job or your spouse’s current job, Social Security says you can generally enroll in Part B during an 8-month Special Enrollment Period after that active coverage or employment ends. The Medicare sign-up tool also warns that the 8-month clock starts when work ends even if you choose COBRA or other non-Medicare coverage.
If you already have Part A, Social Security lets eligible people apply for Part B online during the Special Enrollment Period. If you use paper forms, CMS-40B enrollment is the Part B application, and employment information is generally documented with CMS-L564 for the current-employment Special Enrollment Period.
If an employer cannot complete its part of the employment form, do not give up. Social Security’s Part B instructions list other evidence that may help, including pay stubs, insurance cards, tax records, premium receipts, and explanations of benefits.
Reality check: If the active-work coverage ended more than 8 months ago, the end of retiree coverage or COBRA normally does not restart the Part B clock. Medicare also has limited Special Enrollment Periods for certain exceptional conditions, so ask Social Security if circumstances outside your control caused you to miss an enrollment period.
Protect Prescription Drug Coverage
Part D uses a different clock from Part B. Medicare defines creditable drug coverage as prescription coverage expected to pay, on average, at least as much as Medicare drug coverage. A retiree or COBRA drug plan can be creditable even though it does not protect the Part B deadline.
Medicare says you may owe a Part D late-enrollment penalty if, after your first Medicare drug enrollment opportunity, you go 63 days or more in a row without Medicare drug coverage or other creditable drug coverage. Ask the plan administrator for the written notice showing whether the coverage is creditable and the date it ends.
When employer or union coverage ends, Medicare’s plan enrollment periods say you generally have 2 full months after the month that coverage ends to join a Medicare Advantage plan or a Medicare drug plan. If you involuntarily lose creditable drug coverage, a similar 2-full-month window can apply based on the loss or notice date.
Before joining Part D, ask whether doing so would cancel or reduce other retiree benefits for you, your spouse, or dependents. Medicare specifically warns that employer or union coverage can change when Medicare drug coverage is added. If drug costs are also a problem, see GFS guidance on prescription cost help.
COBRA and Family Members
COBRA can be a useful bridge for a younger spouse, dependent child, or someone who needs the same doctors for a short period. Federal COBRA generally applies to employer plans with 20 or more employees. Some states have continuation laws for smaller employers.
The U.S. Department of Labor’s COBRA worker FAQs say you generally have 60 days to elect COBRA, measured from the later of the coverage loss or the election notice. After you elect it, you generally have 45 days to make the first payment. The Department’s COBRA worker guide says a plan can generally charge up to 102% of the total plan cost, because you may be paying both the former employee and employer shares plus up to 2%.
For a Medicare-eligible retiree, COBRA should not be treated as a substitute for checking Part B. Medicare may pay first once you are Medicare-eligible, and COBRA may pay only a small share if Medicare should have been primary.
A spouse or dependent under 65 may have a different path. HealthCare.gov says a person who loses qualifying job-based or COBRA coverage may qualify for a Marketplace enrollment period. In many loss-of-coverage cases, the window reaches 60 days before and 60 days after the loss. Voluntarily dropping COBRA early does not by itself create that right.
Choose Replacement Coverage
Once Part B timing is safe, compare how you will cover doctors, hospitals, drugs, and out-of-pocket costs. Do not choose only by premium. Check the doctors you use, preferred hospitals, prescriptions, pharmacy, travel needs, and whether prior authorization is common.
| Option | What it can do | Reality check |
|---|---|---|
| Original Medicare + Part D | Keep broad access to Medicare-participating providers and add drug coverage. | You still have cost-sharing unless another coverage source helps. |
| Original Medicare + Medigap + Part D | Help pay some Original Medicare deductibles and coinsurance. | Buying rights can be time-limited, and state rules vary. |
| Medicare Advantage | Provide Medicare benefits through a private plan, usually with drug coverage. | Networks, prior authorization, drug lists, and service areas matter. |
| New retiree or union plan | Continue employer-supported coverage that coordinates with Medicare. | Ask what happens if you also join another drug or Medicare plan. |
| Marketplace or Medicaid | Cover a younger family member or a person who is not using Medicare. | Marketplace savings and Medicare rules are separate. |
For a broader comparison of employer-style insurance and Medicare, see Medicare vs private insurance. If income and health needs make both Medicare and Medicaid relevant, the dual eligible guide explains how the programs can work together.
Check Medigap Rights Before They Expire
Medigap is private Medicare Supplement insurance used with Original Medicare. It is not the same as Medicare Advantage. Medicare says your one-time Medigap Open Enrollment Period usually starts when you are 65 or older and enrolled in Part B, and federal guaranteed-issue rights can apply in certain coverage-loss situations.
If Original Medicare is primary and employer, retiree, COBRA, or union coverage that pays after Medicare is ending, federal guaranteed-issue rights may apply. Use Medicare’s Medigap rights tool and ask your State Insurance Department about state protections.
If you are leaving Medicare Advantage for Original Medicare, different rules may apply. The GFS Medigap trial-right guide covers that situation.
Deadlines to Put on One Page
| Issue | Timing to watch | Keep as proof |
|---|---|---|
| Part B after active work coverage | Up to 8 months after employment or qualifying coverage ends, whichever happens first. | Employment and group-plan records. |
| Medicare Advantage or Part D after employer/union coverage | Generally 2 full months after the month coverage ends. | Plan-end notice and creditable-coverage notice. |
| Part D penalty risk | Avoid 63 days or more in a row without creditable drug coverage. | Annual creditable-coverage letters. |
| COBRA election | Generally 60 days from the later of coverage loss or election notice. | Election packet, envelope, payment receipt. |
| Marketplace after qualifying loss | Often 60 days before or after the coverage loss. | Coverage-loss notice and Marketplace eligibility notice. |
These are common federal rules, not a substitute for checking your exact plan and circumstances. State insurance law, employer plan terms, and special Medicare enrollment rules can add protections.
Gather These Documents
- Plan termination or change notice and the envelope or email date.
- Last pay stub or retirement notice showing when work ended.
- Medical and prescription insurance cards.
- Medicare card, if enrolled.
- COBRA election packet and premium information.
- Creditable prescription drug coverage notice.
- Summary Plan Description and Evidence of Coverage.
- List of doctors, hospitals, pharmacies, and prescriptions.
- Recent claims or Explanation of Benefits statements.
- CMS-40B and CMS-L564 records if using the current-employment Part B enrollment path.
- Income and resource records if you may need Medicare Savings Programs, Extra Help, or Medicaid.
How to Start Without Wasting Time
- Read the ending notice first. Mark dates, automatic plan changes, Medicare instructions, spouse rules, and appeal language.
- Call the plan administrator. Ask what ends, what continues, whether prescription coverage is creditable, and whether Medicare should be primary.
- Contact Social Security if Part B is missing. Lead with the date active employment coverage ended, not just the date the retiree plan ends.
- Use free counseling. Find your local counselor through the SHIP locator. SHIP counselors do not sell Medicare plans.
- Confirm doctors and drugs. Check both the plan directory and the doctor’s office. Check every prescription against the current formulary.
- Keep a call log. Write the date, office, person, answer, confirmation number, and next step.
Denied, Delayed, or Overwhelmed
If the employer is slow with Part B proof: start the enrollment process and ask Social Security what alternate evidence it will accept. Do not assume a missing employer signature means you cannot apply.
If COBRA papers did not arrive: contact the employer benefits office and COBRA administrator. Ask when the qualifying event was recorded, when the notice was sent, and which address was used.
If claims are going to the wrong payer: use Medicare’s who pays first tool, then ask the provider to rebill after the primary payer is confirmed.
If you already missed Part B: contact Social Security and SHIP. You may need the General Enrollment Period, or a limited SEP for exceptional conditions may apply. An ending retiree plan does not by itself fix the old deadline.
If you receive a Part D penalty notice: gather creditable-coverage letters and follow the plan’s reconsideration instructions by the stated deadline.
Backup Help if New Coverage Costs Too Much
Losing employer help with premiums can make Medicare costs feel much larger even when coverage is available. Do not stop at insurance shopping if the real problem is affordability.
- Medicare premiums and cost-sharing: Medicare’s Savings Programs page explains state programs that can help eligible people with certain Medicare costs. GFS also has a Medicare Savings guide.
- Prescription costs: Social Security’s Extra Help page explains help with Part D costs for people who qualify.
- Medicaid: If income and resources are limited, the GFS Medicaid for seniors guide explains how state Medicaid can fit with Medicare.
- Care before coverage settles: If you need low-cost primary care while paperwork is being fixed, see the GFS guide to community health centers.
Official Help
- Medicare: 1-800-633-4227. TTY: 1-877-486-2048. Medicare’s contact options include phone and live chat.
- Social Security: 1-800-772-1213. TTY: 1-800-325-0778. See SSA phone help for current hours.
- SHIP: free local Medicare counseling through the SHIP locator.
- Employer or union plan: use the benefits office or plan administrator listed in the ending notice.
- Marketplace: use HealthCare.gov for a spouse or dependent who may qualify for Marketplace coverage. If someone already has Medicare, Marketplace rules are different.
Phone Scripts
Plan administrator
“My retiree health coverage is ending. Please tell me the exact last day of medical coverage, the last day of prescription coverage, whether the drug coverage is creditable, whether Medicare should pay first, and whether my spouse or dependents have separate rights. Please send the answers in writing.”
Social Security
“I have Medicare Part A but not Part B. My active employer coverage ended on [date]. My retiree or COBRA coverage ends on [date]. Am I within a Part B Special Enrollment Period, and what proof should I submit?”
SHIP counselor
“My retiree plan is ending. I have [Part A only / Parts A and B / Medicare Advantage]. My drug coverage ends on [date]. Can you help me compare Part B timing, Part D, Medigap, Medicare Advantage, and any state protections?”
Spouse coverage
“My spouse is losing coverage through my retiree plan. What date does the spouse’s coverage end? Is COBRA offered? What is the election deadline and monthly premium? Please send the notice and dates in writing.”
Reality Checks
- A phone answer is not enough: ask for written confirmation when a deadline or coverage rule matters.
- COBRA can be costly: the price may jump because the former employer no longer pays its share.
- Medigap rights can expire: do not wait until after other coverage has been gone for months to ask.
- Provider directories can lag: confirm with the medical office as well as the plan.
- Drug lists can change: check the exact medicine, dosage, pharmacy, and any prior authorization.
- Family members may need separate plans: Medicare does not cover a spouse or dependent.
Common Mistakes to Avoid
- Waiting for COBRA or retiree coverage to end before checking Part B.
- Calling all former-employer coverage “active employer coverage.”
- Throwing away creditable drug coverage notices.
- Joining Part D without asking how it affects retiree benefits.
- Canceling the old plan before the new start date is confirmed.
- Forgetting that a spouse under 65 may need a separate Marketplace or COBRA plan.
- Choosing Medicare Advantage before checking doctors, hospitals, drugs, and pharmacies.
- Assuming federal Medigap rules are the only rules; some states add protections.
Resumen en Español
Si termina su plan de jubilado o COBRA, revise primero Medicare Parte B. El período especial de 8 meses normalmente depende de cuándo terminó el trabajo o la cobertura por empleo activo. COBRA y el plan de jubilado no crean un período nuevo de 8 meses.
Para medicamentos, pida prueba de que la cobertura es acreditable y la fecha en que termina. Una brecha de 63 días o más puede causar una penalidad de la Parte D.
Un cónyuge menor de 65 años puede necesitar COBRA, el Mercado, Medicaid u otro plan. No cancele la cobertura anterior hasta confirmar la fecha de inicio de la nueva.
Frequently Asked Questions
Does ending retiree coverage create a Part B Special Enrollment Period?
Usually not. The standard 8-month Part B window is tied to qualifying coverage based on current employment ending. Ask Social Security about unusual circumstances.
Can COBRA let me delay Medicare Part B?
Usually no. COBRA can continue medical coverage, but it is not current-employment coverage for the standard Part B window.
Can retiree or COBRA drug coverage protect me from a Part D penalty?
Yes, if it is creditable. Keep written proof and avoid going 63 days or more without Medicare drug coverage or other creditable coverage.
How long do I have to join a Medicare plan after employer coverage ends?
Medicare says this enrollment window generally lasts 2 full months after the month employer or union coverage, including COBRA, ends.
What if my spouse is younger than 65?
Your spouse may need COBRA, Marketplace coverage, Medicaid, or another employer plan. A qualifying coverage loss can open a Marketplace enrollment window.
What if I already missed the Part B window?
Contact Social Security and SHIP. You may need the General Enrollment Period, while limited relief can apply for certain exceptional conditions.
About This Guide
Sources: This guide uses official federal, state, local, and other high-trust nonprofit and community sources linked in the article.
Editorial note
This guide is produced under the GFS Editorial Standards using official and other high-trust sources. GFS is not affiliated with a government agency and is not a substitute for official agency guidance. Individual eligibility outcomes cannot be guaranteed.
Corrections
Despite careful verification, errors may occur. Readers may email info@grantsforseniors.org with corrections.
Disclaimer
This article is for informational purposes only and is not legal, financial, medical, tax, disability-rights, immigration, insurance, or government-agency advice. Program rules, policies, funding, and availability can change. Readers should confirm current details directly with the responsible official program before acting.
Last updated: 21 September 2026 · Next review: 21 January 2027
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