How Do Medicare Supplement Plans Work with Other Medicare Insurance?

Find affordable Medicare Supplement Insurance plans

Get Started


Medicare Supplement insurance plans are designed to work with Original Medicare and help pay some of the out-of-pocket costs that Original Medicare (Part A and Part B) doesn’t pay, such as coinsurance, copayments, and deductibles.

How do Medicare Supplement plans work with Medicare Advantage plans and other plans?

Medicare Supplement plans only pay for gaps in coverage in Original Medicare, and not Medicare Advantage plans (like HMOs or PPOs), stand-alone Medicare Prescription Drug Plans, employer/union group health coverage, Medicaid, or TRICARE (military retiree benefits). In fact, it’s illegal for an insurance company to sell you a Medicare Supplement plan if you already have a Medicare Advantage plan or Medicaid (a government program, separate from Medicare, that helps pay health-care costs for those who qualify, generally through low income) unless that coverage is ending.

You can only buy a Medicare Supplement plan when you’re in a Medicare Advantage plan if your coverage under the Medicare Advantage plan will end before the effective date of the Medicare Supplement plan.

How do Medicare Supplement plans work with Medicare Part A and Part B?

If you have Medicare Part A and Part B, there are up to ten standardized Medicare Supplement plans available for you in most states. (Medicare Supplement plans are different in Massachusetts, Minnesota, and Wisconsin.) The plans are labeled A, B, C, D, F, G, K, L, M, and N and may cover between four and nine of the following nine benefits:

  • Medicare Part A coinsurance for hospital costs (up to an additional 365 days after Medicare benefits are used)
  • Medicare Part B coinsurance or copayment
  • The first three pints of blood for a medical procedure
  • Part A hospice care coinsurance or copayment
  • Skilled nursing facility care coinsurance
  • Part A deductible
  • Part B deductible
  • Part B excess charges
  • Foreign travel emergencies

All 10 Medicare Supplement plans cover Medicare Part A coinsurance and hospital costs at 100%. Beyond this one benefit the plans differ in what extent they cover certain benefits and what benefits they cover. For example, only Medicare Supplement plans C and F cover the Part B deductible. All plans cover blood, but Plan K covers it at 50% and Plan L covers it at 75% while the other eight plans cover blood at 100%.

If you’re faced with hospitalization for an extended period, a Medicare Supplement plan could save you money. Hospitalization coinsurance costs for days 61-90 are $329 per day. Days 91 and beyond cost $658 per day until a lifetime reserve is met and you must pay all costs. These dollar amounts are for 2017, and all standardized Medicare Supplement plans generally cover these costs for up to a year after Medicare benefits are exhausted.

However, before receiving benefits under Medicare Part A, you need to pay your Part A deductible (in 2017, $1,316 for each benefit period). Some Medicare Supplement plans cover the Part A deducible.

How do Medicare Supplement plans work with other types of insurance?

Generally Medicare Supplement plans don’t cover routine vision or dental care. They also generally don’t cover hearing aids, eyeglasses, private-duty nursing, or long-term care such as nursing home care. For these categories of care you may be able to buy additional insurance from a private insurance company, or be responsible for the full cost.

How will your coverage costs be divided among the insurance plans?

When you have Medicare and other health insurance, such as a Medicare Supplement plan, each type of coverage is called a “payer.” The primary payer will pay what it owes on your health-care bills first and then send the balance to the secondary payer. Coordination of benefit rules decide who pays first. The secondary payer might not pay all of the uncovered costs and some could be your responsibility. For example, if you have a foreign travel emergency, the five Medicare Supplement plans that cover this only cover it up to 80% up to plan limits. You will then be responsible for paying 20% of the covered costs of your care while traveling, as well as any costs your Medicare Supplement plans doesn’t cover.

Generally, people who use health-care services frequently might save money by purchasing a Medicare Supplement plan. However, if you infrequently need medical benefits, you could pay more for the Medicare Supplement plan premium than you save.

To start comparing Medicare plans right now, just enter your zip code in the box on this page and click Go.

The product and service descriptions, if any, provided on these eHealth Insurance Web pages are not intended to constitute offers to sell or solicitations in connection with any product or service. All products are not available in all areas and are subject to applicable laws, rules, and regulations.


Need help?

Call to speak with a licensed
insurance agent now.

Touch to Call

1- TTY users 711

Or, enter your zip code to shop online

Browse Plans
Was this article helpful?
Thank you for your feedback!

The purpose of this communication is the solicitation of insurance. Contact will be made by an insurance agent/producer or insurance company. Medicare Supplement insurance plans are not connected with or endorsed by the U.S. government or the federal Medicare program.

eHealth's Medicare website is operated by eHealthInsurance Services, Inc., a health insurance agency licensed to sell Medicare products.

Medicare has neither reviewed nor endorsed this information.