Is the coverage provided by Medicare as good as my employer-sponsored health insurance?
If you enrolled only in Original Medicare, you would almost certainly notice gaps in coverage that you didn’t have under your employer-sponsored insurance (ESI) plan. But most Medicare enrollees don’t go with the barebones coverage. Of Original Medicare beneficiaries, almost 90% have some sort of supplemental coverage (generally Medigap, employer-sponsored insurance, or Medicaid), according to a Kaiser Family Foundation analysis.
And more than half of all Medicare beneficiaries select Medicare Advantage plans, which incorporate various supplemental coverage in addition to basic Medicare benefits.
Medicare beneficiaries who have supplemental Medicare coverage will generally find that their resulting coverage is quite comprehensive. And depending on the cost of the employer-sponsored plan (including premiums and out-of-pocket costs), some people also end up with lower overall healthcare costs once they switch to Medicare.
How would having Original Medicare, Medigap and a Part D plan compare with my employer-sponsored insurance?
If you opt for Original Medicare plus a Part D Prescription Drug Plan and a Medigap supplement, the coverage is likely to be just as good as – or better than – what you had previously from your employer.
There are Medigap supplements that cover all or nearly all of the costs a person would have under Original Medicare (except prescriptions, which are covered by Part D plans).
Depending on which Medigap supplement and Part D Prescription drug plan you choose, your out-of-pocket expenses could end up being very minimal. And Original Medicare also gives you nationwide access to medical providers. When compared with the more limited provider networks that employer-sponsored health insurance plans typically have, access to doctors and hospitals under Original Medicare is likely to be a welcome change for many new Medicare beneficiaries.
How does Medicare Advantage coverage compare to my employer-sponsored insurance?
Medicare Advantage plans are often relatively inexpensive – some have no premium at all other than the premium for Medicare Part B. And Medicare Advantage plans come with built-in caps on out-of-pocket exposure for services covered under Medicare Part A and Part B, limited to no more than $9,250 for in-network care in 2026.
That does not include the cost of outpatient prescription drugs, since those are not covered under Part A or Part B. But for 2026 plans, all Medicare Part D coverage, including the Part D coverage that’s integrated with most Medicare Advantage plans, has a $2,100 cap on out-of-pocket drug costs (this limit is indexed for inflation; it was $2,000 in 2025).
(Although Medicare Advantage plans have caps on out-of-pocket costs, Original Medicare does not. This is why Medigap supplements are so important if you enroll in Original Medicare, unless you also have access to Medicaid or employer-sponsored supplemental coverage.)
Medicare Advantage plans can also include dental and vision coverage, which isn’t covered under Original Medicare. But Medicare Advantage plans have the same sort of provider network restrictions as other commercial health plans, including most employer-sponsored plans.
This post will walk you through the pros and cons of Original Medicare versus Medicare Advantage for various scenarios.
How do Medicare's costs compare to employer-sponsored insurance?
In 2025, the average employee’s payroll-deducted premium cost for self-only employer-sponsored health insurance was $1,440, or about $120 per month. (This is far lower than the actual cost of coverage, but employers pay an average of almost 85% of their employees’ premiums.) In addition to the premiums, the average employer-sponsored plan had an annual deductible of $1,886 for a single employee in 2025 (among plans that have deductibles, which is the majority of employer-sponsored plans).
When you switch to Medicare, Part A is usually premium-free, due to your work history or your spouse’s work history. Part B costs $202.90 per month for most enrollees in 2026 (higher-income enrollees pay more.) Original Medicare is comprised of Part A and Part B together, although if you continue to work after age 65, you may want to consider delaying your enrollment in Part B and using your employer-sponsored coverage instead.
If you want to add supplemental coverage, the average stand-alone Part D Prescription Drug Plan costs about $34.50 per month in 2026, although there are options in most states with premiums as low as $0/month (higher-income enrollees pay more). According to a KFF analysis, the average Medigap premium was $217/month in 2023, although there is significant variation from one state to another, and from one plan to another.
The average Medicare Advantage premium in 2026 is projected to be about $14 per month (across all Advantage plans, including the majority of plans that have no premiums), in addition to the cost of Part B. Most Medicare Advantage plans include deductibles, and their out-of-pocket maximum for in-network care can be as high as $9,250 in 2026. But the average Medicare Advantage plan’s out-of-pocket maximum is well below that limit, at $5,320 for in-network services.
So if we look only at the averages, Original Medicare plus a comprehensive Medigap plan and a Part D Prescription Drug plan would cost roughly $454 per month ($202.90 plus $34.50 plus $217), while Medicare Advantage would cost roughly $217 per month (about $14 plus $202.90). Of course, the actual numbers vary considerably depending on where you live and which plans you select once you enroll in Medicare; there are plenty of lower-priced Medigap and Part D plans, and the right choice will depend on your specific needs and budget.
And again, keep in mind that Original Medicare plus a comprehensive Medigap plan and a Part D plan could leave you with very little in the way of out-of-pocket costs for most medical needs, whereas a Medicare Advantage plan can have out-of-pocket costs as high as $9,250 for in-network services in 2026, in addition to out-of-pocket costs for prescriptions. And the Advantage plan will tend to have a fairly limited provider network, which may or may not resemble the coverage you’ve had through your employer.
To see how your costs under Medicare will compare with what you pay now for your employer-sponsored plan, you’ll want to consider the premiums as well as the out-of-pocket costs for the various coverage options available to you, and see how they stack up against your employer-sponsored coverage.
Louise Norris is an individual health insurance broker who has been writing about health insurance and health reform since 2006. She has written hundreds of opinions and educational pieces about the Affordable Care Act and Medicare for healthinsurance.org and medicareresources.org.
