Medicare Advantage is an alternative way to receive your Medicare benefits. Instead of using original Medicare Parts A and B directly, you receive your coverage through a private insurance plan that Medicare has approved and contracted with. It is also called Part C.
This article explains how Medicare Advantage works, what to expect from it, and the key questions to ask when evaluating plans.
How does Medicare Advantage differ from original Medicare?
With original Medicare, you use your Medicare card directly at the point of care and can see any provider who accepts Medicare. With Medicare Advantage, your benefits flow through a private plan with its own network, rules, and cost structure. You use the Advantage plan's card instead of your Medicare card, and the plan manages your coverage.
With original Medicare, you use your Medicare card at the point of care, Medicare processes the claim, pays its share, and bills the remainder to you or your supplemental insurer. You generally need to see doctors and other providers who are in your plan's network.
With Medicare Advantage, your Medicare benefits flow through a private plan instead. According to Medicare.gov, these plans must cover everything original Medicare covers, but they do so using their own network, rules, and cost structure. Your Medicare card is generally not used at the point of care - you use your Advantage plan's card instead.
What does Medicare Advantage typically include?
Most Medicare Advantage plans bundle Part A, Part B, and Part D coverage together, along with additional benefits that original Medicare does not cover, such as routine dental, vision, hearing, and fitness programs. The extent of those added benefits varies significantly by plan and location, so the details matter more than the benefit categories.
Most Medicare Advantage plans bundle several types of coverage together:
- Part A coverage (hospital, skilled nursing, hospice)
- Part B coverage (outpatient, preventive, specialist care)
- Part D prescription drug coverage (most plans include this, though some do not)
- Additional benefits that original Medicare does not cover, such as routine dental, vision, hearing, and fitness programs
According to Medicare.gov, the additional benefits vary significantly from plan to plan and by location. What one plan includes - and how generous those benefits are - may be very different from another plan in the same area or from a plan with a similar name in a different county.
It is worth looking carefully at the actual coverage details rather than the benefit categories. A plan that advertises dental coverage, for example, may cover only basic cleanings and x-rays up to a modest annual limit. Whether that is meaningful for your needs depends on what you actually use.
How do network restrictions work with Medicare Advantage?
Most Medicare Advantage plans restrict you to a network of providers. HMO plans generally require you to stay in-network for non-emergency care and may require referrals for specialists. PPO plans allow out-of-network care at a higher cost. If you have established specialist relationships or spend time in multiple states, this is a key consideration.
One of the primary trade-offs with Medicare Advantage is that most plans restrict you to a network of providers. The two most common plan types are:
HMO (Health Maintenance Organization). Generally requires you to use providers within the plan's network for non-emergency care. Seeing an out-of-network provider typically means paying the full cost yourself. An HMO plan may also require a referral from your primary care physician to see a specialist.
PPO (Preferred Provider Organization). Offers more flexibility - you can generally see out-of-network providers, but you pay more for doing so than you would for in-network care. Referrals are typically not required.
Network restrictions matter more in some situations than others. If you have established relationships with specific specialists, if you spend time in multiple states, or if you live in an area with a limited network, the flexibility of original Medicare plus Medigap may be a more practical fit. If you primarily use in-network providers and the plan's network is strong in your area, an Advantage plan may work well.
What is prior authorization and how does it affect Medicare Advantage members?
Prior authorization means the plan must approve certain services before they are covered. This does not exist in the same way with original Medicare. A 2022 HHS Inspector General report found that Medicare Advantage plans denied a notable share of prior authorization requests that met Medicare coverage criteria, leading to delayed or disrupted care in some cases.
Many Medicare Advantage plans require prior authorization for certain services - meaning the plan must approve a service before it is covered. This process does not exist in the same way with original Medicare, which generally covers services when they are medically necessary without requiring advance approval from the insurer.
A 2022 report by the HHS Office of Inspector General found that Medicare Advantage plans denied a notable share of prior authorization and payment requests that met Medicare coverage criteria, and that some of those denials led to delayed or disrupted care. Congress and CMS have since taken steps to address the issue, but prior authorization practices continue to vary significantly by plan. Before enrolling in any Advantage plan, it is worth asking specifically about its prior authorization requirements, typical approval timeframes, and the process for appealing a denial.
The extent of prior authorization requirements varies by plan. It is worth asking about this specifically when evaluating plans, particularly if you have ongoing specialist care or expect to need procedures.
How does the cost structure of Medicare Advantage work?
Medicare Advantage plans often have lower monthly premiums than Medigap, and some have zero-dollar premiums (though you still pay your Part B premium). In exchange, you pay copays, coinsurance, and deductibles when you use services. Unlike original Medicare, Advantage plans do have an annual out-of-pocket maximum, capping your total in-network costs for the year.
Medicare Advantage plans often have lower monthly premiums than Medigap policies, and some plans have premiums of zero (though you still pay your Part B premium). In exchange, plans typically have cost-sharing structures - copays, coinsurance, and deductibles - that apply when you use services.
Medicare Advantage plans do have an annual out-of-pocket maximum, which original Medicare does not. Once you reach that limit, the plan covers 100% of covered in-network costs for the rest of the year. The maximum varies by plan and is set within limits established by CMS each year.
For people who use relatively few services, the lower premium of an Advantage plan can make financial sense. For people with higher or less predictable health care use, comparing the total potential cost under each option - not just the premium - is important.
Does Medicare Advantage availability vary by where you live?
Yes, Medicare Advantage plan availability and quality is highly local and determined by the county you live in. Urban and suburban areas often have many plans to compare. Rural areas may have limited options and narrower networks. Experiences from friends or family in other parts of the country may not apply to what is available where you live.
Medicare Advantage plan availability and quality is highly local. In some urban and suburban areas, there are many plans to compare with robust networks. In rural areas, options may be limited, and networks may cover fewer providers. According to Medicare.gov, plan availability is determined by the county you live in.
This means advice or experiences from friends or family in other parts of the country may not translate directly to what is available where you live.
Can you switch back to original Medicare from Medicare Advantage?
Yes, you can leave Medicare Advantage and return to original Medicare during certain enrollment periods. However, if you want to add Medigap at that point, you may face medical underwriting in most states - meaning insurers can charge more or decline coverage based on your health. The longer you have been on Medicare Advantage, the more this could matter.
You can leave Medicare Advantage and return to original Medicare during the Medicare Advantage Open Enrollment Period (January 1 to March 31 each year) or during the fall Annual Enrollment Period. However, if you want to add Medigap coverage when you return to original Medicare, you may be subject to medical underwriting in most states - which means insurers can charge more or decline coverage based on your health. The longer you have been on Medicare Advantage, the more this could matter. See our article on Medigap open enrollment and guaranteed issue rights for more detail.
Getting Help Comparing Plans
Medicare.gov's Plan Finder tool allows you to compare Medicare Advantage plans available in your area, including what each plan covers, what it costs, and its quality ratings. A SHIP counselor can help you interpret what you find and compare it to your alternatives.
When speaking with a broker or SHIP counselor, ask specifically about prior authorization requirements and the plan's appeals process. The OIG has documented concerns about denial rates in Medicare Advantage, and understanding how a specific plan handles these situations - before you enroll - becomes more important as healthcare needs grow over time.
Find your local SHIP counselor at shiphelp.org or by calling 1-877-839-2675. A licensed independent Medicare insurance broker can also help you compare specific plan options without being tied to a single insurer.
Medicare Advantage plan availability, benefits, networks, and costs change each year and vary by county. Visit medicare.gov or speak with a SHIP counselor for current information specific to your area. A SHIP counselor can give you personalized guidance on Medicare options at no cost. Find yours at shiphelp.org.