Medicare Advantage vs Original Medicare: which is better for my parent?

Updated October 6, 2026 · General information, not professional advice

Short answerIt depends on your parent's health, doctors and budget. Original Medicare with a Medigap policy and Part D usually costs more each month but lets them see any doctor who takes Medicare with few approvals, while Medicare Advantage often has lower premiums and extras but uses networks, prior authorization and copays up to a yearly limit.

Medicare Advantage vs Original Medicare: the key difference

Original Medicare is run by the federal government. Your parent can use any doctor or hospital in the US that takes Medicare, usually without referrals or prior approval. They pay 20% coinsurance after the Part B deductible, with no yearly cap, so most people add a Medigap policy and a separate Part D drug plan.
Medicare Advantage (Part C) is offered by private insurers approved by Medicare. It replaces Original Medicare's way of paying for Part A and B services, usually includes drug coverage, and has a yearly out-of-pocket limit for covered services. Plans may require using network providers, referrals and prior authorization.

When Original Medicare plus Medigap often fits

Your parent has serious or chronic conditions and sees several specialists.
They want to use a specific hospital or cancer center that may not be in a plan's network.
They split time between two states or travel often in the US.
They want predictable costs: with many Medigap plans, out-of-pocket costs for covered services are low.
They want to avoid prior approval for rehab, skilled nursing or home health.

The trade-off is cost: Medigap premiums plus the Part B premium ($202.90 a month in 2026) plus Part D.

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When Medicare Advantage often fits

Your parent's doctors and hospital are in a plan's network.
They want a low or $0 extra premium (they still pay the Part B premium).
They value extras that Original Medicare doesn't cover, like some dental, vision, hearing or fitness benefits.
They are comfortable with care coordination, referrals and prior authorization.
They can't pass Medigap medical underwriting and want a cap on costs.

The Medigap trap to know about

Your parent has a federal right to buy any Medigap policy without health questions during their 6-month Medigap Open Enrollment Period, which starts when they're 65 and enrolled in Part B. After that, if they are in Medicare Advantage and later want to switch back to Original Medicare, insurers in most states can turn them down or charge more because of their health, unless a guaranteed issue right or special state rule applies.

So the first choice matters. If your parent might want broad access later, think carefully before leaving Original Medicare and Medigap.

Some states give people extra rights to buy or switch Medigap policies. Ask your state insurance department or SHIP before making a change.

Costs to compare side by side

Build a simple yearly estimate for each option:

Original Medicare path: Part B premium ($202.90 a month in 2026), plus the Medigap premium, plus the Part D premium, plus expected drug costs. With a Medigap Plan G, the main other cost is the Part B deductible ($283 in 2026).
Medicare Advantage path: Part B premium, plus any plan premium, plus copays for expected doctor visits, tests and drugs. Then check the worst case: the plan's yearly out-of-pocket maximum plus drug costs.

For a parent who is healthy now, Medicare Advantage often looks cheaper. For a parent who expects surgery, rehab, cancer treatment or frequent specialist visits, compare the worst-case numbers carefully. Drug costs for both paths are capped for covered Part D drugs: $2,100 in 2026 and $2,400 in 2027.

How to compare for your parent

List their doctors, hospitals, pharmacies and every prescription with dose.
Use Medicare's Plan Finder at Medicare.gov to compare total yearly costs, networks and star ratings.
For Medicare Advantage, check the out-of-pocket maximum, the copays for hospital stays and skilled nursing, and which services need prior authorization.
For Medigap, get premium quotes; prices for the same standardized plan vary by insurer.
Get free, unbiased help from your State Health Insurance Assistance Program (SHIP).

Changes for 2027 can be made during Open Enrollment, October 15 to December 7, 2026. When your parent needs care, seniorcare.si can show licensed providers near your ZIP code.

Common questions

Can my parent switch from Medicare Advantage back to Original Medicare?

Yes, during Open Enrollment (October 15 to December 7) or the Medicare Advantage Open Enrollment Period (January 1 to March 31). Getting a Medigap policy afterward may require passing health questions.

Is Medicare Advantage cheaper?

Monthly premiums are often lower, but costs when your parent is sick can be higher because of copays up to the plan's yearly limit. Compare total expected costs, not just premiums.

Can you have Medigap and Medicare Advantage together?

No. Medigap only works with Original Medicare.