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Last updated: 23 September 2026
Medicare and private health insurance are not always opposites. Medicare Advantage and Medigap are private insurance products that work inside the Medicare system. Employer plans, retiree plans, COBRA, and Marketplace plans follow different rules. The best choice depends on your work status, doctors, prescriptions, budget, and enrollment dates.
Bottom Line
For many people age 65 and older, Medicare becomes the core health coverage. But a senior who still has strong group coverage from current work may be able to delay Part B without a penalty. If you have employer, retiree, COBRA, or Marketplace coverage, do not cancel it or delay Medicare until you know which plan pays first and which enrollment deadline applies.
Need Help Before a Deadline?
If you are about to retire, lose job coverage, or turn 65, check your Medicare dates before making any change. Medicare says the Part B Special Enrollment Period tied to current-employment coverage generally lasts 8 months after the employment or that coverage ends, whichever happens first. COBRA does not extend that clock. Start with Medicare’s working past 65 guidance or call Social Security before coverage ends.
Start Here
- Write down every plan you have. Include Medicare, employer coverage, retiree coverage, COBRA, Marketplace coverage, Medicaid, VA coverage, or a spouse’s plan.
- Write down the dates. Note your 65th birthday month, retirement date, job coverage end date, Part A start date, Part B start date, and any COBRA or Marketplace end date.
- Ask who pays first. Medicare’s payer-order tool can help. If the answer is still unclear, call the employer plan or the Benefits Coordination & Recovery Center before you make changes.
Quick-Reference Table
| Situation | Best first step | Main risk to check |
|---|---|---|
| Turning 65 and still working | Ask whether the plan is based on current employment and who pays first | Small-employer rules can make Medicare primary |
| Retiring or losing job coverage | Plan the Part B start date before coverage ends | Missing the Special Enrollment Period |
| Want broad doctor choice | Compare Original Medicare plus Medigap and Part D | Medigap timing, premiums, and state rules |
| Want one Medicare plan | Compare Medicare Advantage plans | Networks, prior authorization, and yearly costs |
| Low income or high drug costs | Check Medicare cost-help programs | Assuming you are over the limit without applying |
What Has Changed Since the Last Review
The main 2026 federal amounts in this guide remain the same after a September recheck: the standard Part B premium is $202.90 a month, the Part B deductible is $283, and the Part D out-of-pocket maximum for covered drugs is $2,100. This update also makes the employer-size rule clearer and strengthens the warning that COBRA does not extend the Part B Special Enrollment Period. Marketplace language was tightened to reflect current HealthCare.gov rules.
What “Medicare vs Private Insurance” Really Means
The phrase can be confusing because some Medicare choices are sold by private insurance companies. Original Medicare is run by the federal government. Medicare Advantage plans are private plans approved by Medicare. Medigap policies are private supplemental policies that work with Original Medicare.
Other private coverage may come from a current employer, a former employer, a union, COBRA, or the Health Insurance Marketplace. Those plans do not automatically follow the same rules as Medicare Advantage or Medigap.
The most useful question is usually not, “Which one is better?” It is, “Which coverage should be primary for me, what extra coverage do I need, and what deadlines apply?” Medicare explains the two main Medicare paths in its Original vs Advantage comparison.
If you are leaving a job or a retiree plan is changing, the GFS guide on a retiree plan ending can help you organize the transition without missing Medicare dates.
Medicare vs Private Insurance: Side-by-Side
| Feature | Original Medicare | Medicare Advantage | Employer or other private plan | |||
|---|---|---|---|---|---|---|
| Who runs it | Federal Medicare program | Private insurer approved by Medicare | Doctor choice | Any provider that accepts Medicare | Usually uses a network for non-emergency care | Depends on the plan |
| Drug coverage | Usually a separate Part D plan | Most plans include Part D | Depends on the plan | |||
| Yearly medical out-of-pocket limit | No built-in limit for Part A and Part B unless other coverage helps | Plan has a yearly limit for covered Medicare services | Depends on plan design | |||
| Prior authorization | Usually less common for covered services | May be required for some services | Depends on plan rules | |||
| Best fit | People who value broad provider access | People whose doctors, hospitals, drugs, and network fit the plan | Some workers, spouses, retirees, and transition cases |
Do not choose by premium alone. Check doctors, hospitals, prescriptions, travel needs, deductibles, coinsurance, copays, and the worst-case yearly cost.
2026 Costs That Matter Most
For 2026, the standard Medicare Part B premium is $202.90 a month, and the Part B deductible is $283. CMS publishes those amounts in its 2026 Part B notice. Some higher-income beneficiaries pay more because of the Income-Related Monthly Adjustment Amount, often called IRMAA.
After the Part B deductible, Original Medicare usually leaves 20% coinsurance for many Part B services. Original Medicare has no built-in yearly out-of-pocket maximum for Part A and Part B. Medicare Advantage plans do have a yearly limit for covered Medicare services. Medicare explains this difference on its 2026 cost page.
For covered Part D prescription drugs, the 2026 out-of-pocket maximum is $2,100. Medicare also says no Part D plan may have a deductible above $615 in 2026. See the official Part D cost rules. The GFS Part D cap guide explains what counts toward the cap.
If your income recently dropped after retirement, a work stoppage, divorce, marriage change, or another qualifying life event, Social Security may allow an IRMAA reconsideration. The GFS IRMAA appeal guide explains that process.
Employer Coverage After 65
If you or your spouse are still working, current-employment group coverage may allow you to delay Part B without a late penalty. But the payer order matters.
For someone age 65 or older with group health coverage based on current employment, Medicare says the group plan generally pays first when the employer has 20 or more employees. Medicare generally pays first when the employer has fewer than 20 employees. Multi-employer plans can have special rules, so ask the benefits administrator. Medicare’s coordination guidance is the safest place to confirm the order.
If Medicare should pay first and you do not have Part B, the employer plan may not pay as you expect. That can leave a large bill. Do not assume that having an insurance card means the employer plan stays primary after age 65.
Phone script: employer benefits office
“I am 65 or older and covered because of current employment. Does our group plan pay before Medicare or after Medicare? How many employees count under the Medicare rule, and what happens if I delay Part B?”
If current job coverage is ending, Medicare gives an 8-month Special Enrollment Period to sign up for Part B after the employment or job-based coverage ends, whichever comes first. The GFS Medicare penalty guide explains the main timing traps.
Phone script: Social Security
“My current-employment health coverage is ending, and I need to add Medicare Part B. Which enrollment period applies to me, what proof of employer coverage is required, and what start date can I request?”
Social Security’s Part B enrollment page lists the CMS-40B application and the CMS-L564 employment-information form used for many Special Enrollment Period requests.
COBRA and Marketplace Coverage After 65
COBRA
COBRA can keep former job coverage for a limited time, but it is not the same as coverage based on current employment. Medicare states that COBRA does not extend the 8-month Part B Special Enrollment Period. If you wait for COBRA to end, you can miss the Part B window and face a gap or lifetime penalty. Read Medicare’s COBRA and Medicare rules before deciding.
If you already have Medicare and then take COBRA, Medicare generally pays first for a person age 65 or older. Ask the COBRA plan what it pays after Medicare.
Marketplace plans
A Marketplace plan can be useful before Medicare begins, but Medicare and the Marketplace do not work together like two coordinated health plans. HealthCare.gov says people generally cannot get Marketplace savings once they are eligible for Medicare Part A, and once Part A or Medicare Advantage begins, they should end Marketplace coverage for the person moving to Medicare. People who must pay a premium for Part A can have a different choice, so they should compare carefully.
Do not assume Marketplace coverage stops automatically. HealthCare.gov’s Medicare transition steps explain how to update the application and end coverage for the person starting Medicare while keeping eligible household members enrolled.
Phone script: Marketplace
“My Medicare starts on this date. I need to end Marketplace coverage and any premium tax credit for me at the correct time, while keeping coverage for other household members if they still qualify. What date should I report?”
Original Medicare, Medicare Advantage, and Medigap
Original Medicare
Original Medicare includes Part A and Part B. You can generally use any doctor or hospital in the United States that accepts Medicare. This can help people who travel, live in more than one state, or use specialists in different health systems.
The tradeoff is cost exposure. There is no built-in annual limit on Part A and Part B out-of-pocket costs. Many people pair Original Medicare with a Part D drug plan and Medigap, Medicaid, employer coverage, or retiree coverage.
Medicare Advantage
Medicare Advantage, also called Part C, is Medicare coverage offered through a private company approved by Medicare. You must have Part A and Part B to join. Most plans include drug coverage, and plans may offer extra benefits that Original Medicare does not routinely cover.
In return, you may need to use network providers for non-emergency care and may need prior authorization for some services. Check the doctors, hospitals, pharmacies, drug list, and rules every year. If a plan denies a service, the GFS Advantage appeal guide explains the next steps.
Medigap
Medigap is private insurance that supplements Original Medicare. It can help pay some deductibles, coinsurance, and copays. It does not work with Medicare Advantage.
Federal law gives most people a one-time 6-month Medigap Open Enrollment Period starting the first month they are 65 or older and enrolled in Part B. During that period, insurers cannot deny a Medigap policy because of pre-existing health problems. After that period, choices can be more limited or more expensive, although state rules and guaranteed-issue rights can help in some situations. Medicare explains the window in its Medigap buying guide.
If you try Medicare Advantage and want to return to Original Medicare, special Medigap rights may apply in limited situations. The GFS Medigap trial-right guide explains those protections.
Help With Medicare Costs
If Medicare looks unaffordable, check assistance before deciding that private coverage is the only answer. Medicare Savings Programs can help eligible people pay Part A or Part B premiums and, depending on the program, deductibles, coinsurance, and copays. Rules are run through each state, and some states use more generous limits than the federal baseline. Medicare’s Savings Program page explains the 2026 rules.
The GFS Medicare Savings guide gives a plain-English overview and application path.
Extra Help can reduce Part D premiums, deductibles, and prescription costs for people with limited income and resources. Medicare lists the 2026 rules on its Extra Help page. GFS also has an Extra Help guide for the application process.
People who qualify for both Medicare and Medicaid can have different plan choices and important billing protections. The GFS dual eligible guide explains how the two programs fit together.
How to Choose Without Wasting Time
- Confirm your Medicare dates. Know when Part A and Part B start or when you can enroll.
- Confirm who pays first. Do this before delaying Part B or keeping another plan.
- List your doctors. Check every specialist, hospital system, therapy provider, and pharmacy you rely on.
- List your prescriptions. Use Medicare’s Plan Compare to check formularies, pharmacies, and estimated yearly costs.
- Compare total yearly cost. Include premiums, deductibles, copays, coinsurance, drug costs, and the plan’s out-of-pocket limit.
- Check travel needs. Original Medicare generally has broader U.S. provider access. Medicare Advantage networks may be more local except for emergency or urgently needed care.
- Check drug-creditable status. If you keep employer or union drug coverage, ask for written proof that it is creditable. Medicare warns that going 63 days or more without Part D or other creditable drug coverage can trigger a late penalty. See the creditable coverage rules.
- Get neutral help. State Health Insurance Assistance Program counselors are not insurance-company sales agents. The GFS SHIP help guide explains what to bring.
Phone script: SHIP counselor
“I am comparing Medicare with other coverage. I have these plans, these doctors, these prescriptions, and these dates. Can you help me check who pays first, whether I can delay Part B, and which Medicare option fits my situation?”
Documents and Information to Gather
- Medicare card, if you already have one
- Employer, retiree, COBRA, Marketplace, Medicaid, or union insurance cards
- Employment and coverage end dates
- Employer letter showing current group coverage, if applicable
- Creditable prescription drug coverage notice
- List of doctors, hospitals, pharmacies, and prescriptions
- Recent plan premium and benefit summaries
- Medigap quote information, if comparing supplements
Common Mistakes to Avoid
- Waiting for COBRA to end. COBRA does not pause the Part B Special Enrollment Period.
- Treating retiree coverage like active job coverage. Retiree plans often expect Medicare to pay first.
- Choosing by premium alone. A low premium can hide high copays, narrow networks, or drug costs.
- Assuming Medigap is always available later. Federal open-enrollment protections are strongest during the one-time 6-month Medigap window.
- Ignoring drug coverage status. Keep proof that employer or union drug coverage is creditable.
- Trusting only an online provider directory. Confirm an important doctor or hospital with both the provider and the plan.
- Canceling coverage too early. Get the new effective date in writing before ending existing insurance.
Denied, Delayed, or Overwhelmed
If a problem occurs, contact the office that controls that problem. Enrollment issues usually start with Social Security. Payment-order questions go to the employer plan or Medicare’s Benefits Coordination & Recovery Center. Medicare Advantage denials start with the plan and its written appeal instructions.
| Problem | First contact | Question to ask |
|---|---|---|
| Part B enrollment problem | Social Security | Which enrollment period applies, and what proof is needed? |
| Employer plan did not pay | Benefits office and BCRC | Which plan should be primary for this claim? |
| Medicare Advantage denial | The plan | What is the denial reason and appeal deadline? |
| Drug coverage penalty | Drug plan | What creditable-coverage proof can I submit? |
| Cannot afford Medicare costs | State Medicaid office or SHIP | Which cost-help programs should I apply for? |
If you are switching away from Medicare Advantage, do not assume you can automatically buy any Medigap policy. Check your guaranteed-issue rights before you leave the plan.
Official Resources
- Medicare: Call 1-800-MEDICARE (1-800-633-4227), TTY 1-877-486-2048, or use Medicare contact help.
- Social Security: Call 1-800-772-1213, TTY 1-800-325-0778, or use Social Security phone help for Part A and Part B enrollment questions.
- SHIP: Medicare says SHIP offers free counseling that is not connected to insurance companies or health plans. Use Medicare’s counseling resource page to find help.
- Benefits Coordination: For payer-order questions, call the Benefits Coordination & Recovery Center at 1-855-798-2627, TTY 1-855-797-2627.
- Marketplace: If Medicare is starting, update the Marketplace application so coverage and any savings end at the right time for the person moving to Medicare.
Resumen en Español
En resumen: Medicare suele convertirse en la cobertura principal para muchas personas de 65 años o más, pero una persona que todavía tiene seguro de un empleo actual puede tener reglas diferentes. Antes de cancelar un plan privado o retrasar la Parte B, confirme qué seguro paga primero.
Fechas importantes: si termina el empleo o el seguro basado en empleo actual, normalmente hay un período especial de 8 meses para inscribirse en la Parte B. COBRA no extiende ese período. También revise médicos, medicamentos, costos y la red del plan antes de escoger Medicare Advantage o mantener otro seguro.
Ayuda con costos: Medicare Savings Programs, Extra Help y Medicaid pueden reducir algunos gastos para personas que califican. SHIP ofrece orientación gratuita y personalizada sobre Medicare.
Frequently Asked Questions
Is Medicare better than private insurance for seniors?
There is no single answer for everyone. Medicare is the core coverage for many seniors, but current employer coverage may remain primary in some situations. Medicare Advantage and Medigap are also private insurance products, so the real choice is often how to combine or compare Medicare options with other coverage.
Can I keep employer insurance after age 65?
Yes, in many cases. If the coverage is based on current employment, ask who pays first. For people age 65 or older, a group plan from an employer with 20 or more employees generally pays first; with fewer than 20 employees, Medicare generally pays first.
Does COBRA let me delay Medicare Part B?
COBRA does not extend the Part B Special Enrollment Period tied to current employment. Medicare says the 8-month period starts when employment or current job-based coverage ends, whichever happens first.
Can a Marketplace plan replace Medicare?
Usually not for someone eligible for premium-free Medicare Part A. Marketplace savings generally are not available once Medicare eligibility applies, and Marketplace coverage does not replace Part B. People who must pay a Part A premium can have a different choice and should compare carefully.
Is Medicare Advantage private insurance?
Yes. Medicare Advantage plans are offered by private companies approved by Medicare. You still have Medicare, but the private plan provides your Part A and Part B benefits and usually uses its own network and plan rules.
Can I use Medigap with Medicare Advantage?
No. Medigap supplements Original Medicare. It is not used to pay Medicare Advantage copays, deductibles, or coinsurance.
What are the main Medicare costs in 2026?
The standard Part B premium is $202.90 a month and the Part B deductible is $283 in 2026. For covered Part D drugs, the 2026 out-of-pocket maximum is $2,100. Your total cost still depends on your plan, income, services, drugs, and other coverage.
Where can I get free help comparing plans?
Contact your State Health Insurance Assistance Program, or SHIP. SHIP provides free personalized Medicare counseling and is not connected to an insurance company or health plan.
About This Guide
Sources: This guide uses official federal and other high-trust 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. 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, plan networks, costs, and availability can change. Confirm current details directly with the responsible program or plan before acting.
Last updated: 23 September 2026 · Next review: 23 January 2027
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