New Jersey Medicare Advantage FAQ

Medicare Advantage (Part C) plans are the most popular alternative to Original Medicare, with more than half of all Medicare beneficiaries now enrolled in one. Below are answers to the questions New Jersey residents ask most often about how these plans work, what they cover, and what to watch out for.

What Is Medicare Advantage?

What is a Medicare Advantage plan?

A Medicare Advantage plan, also known as Medicare Part C, is a health insurance plan offered by a private company that delivers all your Medicare benefits in one package. These plans replace Original Medicare (Part A and Part B) and typically include extras like prescription drug coverage, routine dental care, and vision services.

There are several types of Medicare Advantage plans available, including HMOs, PPOs, and Special Needs Plans. Every plan must cover everything Original Medicare covers, but costs, provider networks, and rules vary. Some also offer perks like fitness programs or hearing aid coverage. If you're new to Medicare, understanding these plan types is a great first step.

How does a Medicare Advantage plan work?

When you enroll in a Medicare Advantage plan, a private insurer takes over delivery of your Medicare benefits. You still have Medicare, but you receive your Part A and Part B services through the plan rather than directly from the federal program.

To be eligible, you need both Medicare Part A and Part B, and you must live in the plan's service area. Review the full Medicare Advantage eligibility requirements and confirm your Medicare eligibility to make sure you qualify.

Most plans charge a monthly premium on top of your Part B premium. You'll also pay copayments, coinsurance, or deductibles when you use services. Every Medicare Advantage plan sets a yearly out-of-pocket maximum that caps what you spend on covered services in a calendar year.

Coverage, Benefits, and Limitations

What is covered by a Medicare Advantage plan?

Every Medicare Advantage plan must cover all services that Original Medicare covers, including hospital stays, doctor visits, and preventive services. Most plans also bundle in Part D prescription drug coverage.

Many plans go further with benefits Original Medicare doesn't offer: routine dental coverage, vision exams, hearing aids, fitness memberships, and sometimes meal delivery after a hospital stay. These extras are a big part of what's driving seniors to Medicare Advantage. For a broader look at what's included, see our guide to Medicare coverage.

Plans can change every year, though, and benefits aren't guaranteed long-term for New Jersey residents either. "Approximately 10% of Medicare Advantage enrollees were affected by plan terminations or carrier withdrawals this past year," says Christina Stanley, a licensed Medicare agent in Idaho. "This highlights the importance of reviewing your coverage each year. Medicare Advantage plans can change annually, including premiums, copays, provider networks, prescription drug coverage, and extra benefits. What worked well last year may not be the best fit this year."

Coverage details vary by plan and region. Before enrolling, compare specific New Jersey plans using Medicare star ratings and the plan finder at medicare.gov.

Are there any limitations or exclusions with Medicare Advantage plans in New Jersey?

Yes. While Medicare Advantage plans must cover everything Original Medicare covers, they can impose rules Original Medicare does not.

Network restrictions are the most common limitation. PPO plans allow out-of-network visits at higher cost, while HMO plans typically require you to use in-network providers and get referrals for specialists. For a deeper look at how these two network models compare, see our breakdown of HMO vs PPO Medicare Advantage plans.

Agents in New Jersey and across the country see this trip people up constantly. "Medicare Advantage looks great on paper, but can create problems when you actually need care," says John Hawk, a licensed Medicare agent in New Jersey. "If your doctor leaves the network — or you need a specialist — you may be stuck or paying out-of-pocket. Low premiums are appealing, but copays, coinsurance, and the annual MOOP can surprise people with serious health events."

Surprise bills are another common pain point, especially with lab work. "The single best way to avoid surprise lab bills with a Medicare Advantage plan is to make sure both the doctor and the laboratory are in your plan's network before the test is performed," says Kathy Detweiler, a licensed Medicare agent in Texas. "Many surprise bills happen when an in-network physician sends blood work to an out-of-network lab without the patient realizing it. Don't assume the doctor's office knows your plan's network rules — call the member services number on your card and confirm."

Prior authorization is another factor. Many Medicare Advantage plans require pre-approval before covering certain procedures, tests, or medications. If a claim is denied, you have the right to appeal the decision.

Appeals can and do succeed when handled correctly. "I had a client whose Medicare Advantage plan denied a needed cardiac procedure, labeling it as not medically necessary," says Ann Sanfelippo, a licensed Medicare agent in Florida. "I worked with the provider to gather detailed medical records, physician notes, and a strong letter of medical necessity, then guided the client through the formal appeal process. The appeal was ultimately approved, and the procedure was covered. The key was persistence, proper documentation, and understanding how to navigate the system step-by-step."

Services not covered by any Medicare Advantage plan include most long-term custodial care and routine care received outside the United States. Always review your plan's Evidence of Coverage document for the full list of exclusions.

Enrolling in Medicare Advantage

How do I enroll in a Medicare Advantage plan?

You can enroll in a Medicare Advantage plan during one of several enrollment windows:

• Initial Enrollment Period (IEP): A seven-month window centered on the month you turn 65, starting three months before your birthday month and ending three months after.
• Annual Election Period (AEP): October 15 through December 7 each year. Changes take effect January 1.
• Medicare Advantage Open Enrollment Period (MA OEP): January 1 through March 31. Current MA enrollees can switch to a different MA plan or return to Original Medicare.

You may also qualify for a Special Enrollment Period if you experience certain life changes, like moving out of your plan's service area or losing employer coverage.

To enroll, visit medicare.gov, call 1-800-MEDICARE (1-800-633-4227), or contact the plan directly. You'll need your Medicare number and coverage effective dates.

How much does a Medicare Advantage plan cost?

Costs vary by plan and insurer. The main components:

• Monthly premium: Some plans charge $0 beyond your Part B premium; others charge an additional monthly fee.
• Copayments and coinsurance: A set amount or percentage when you receive covered services.
• Deductible: Some plans require you to meet an annual deductible before coverage kicks in.
• Out-of-pocket maximum: Every plan caps your total annual spending on covered services.

Medicare Advantage premiums are often lower than Medicare Supplement premiums, but out-of-pocket costs at the point of care tend to be higher. Use our Medicare plan comparison checklist to weigh total costs side by side. Be aware of potential Medicare penalties if you miss enrollment deadlines.

It's worth thinking past the sticker price, whether you're shopping in New Jersey or anywhere else. "It's hard to complain when many of the Advantage plans start at $0 monthly premiums," says Valerie Tobin, a licensed Medicare agent in Wisconsin. "However, it can be concerning with an Advantage plan due to the high annual out-of-pocket costs and the requirements regarding which doctors you can see. Many people switch to an Advantage plan and take a chance that they will not have costly medical needs. Unfortunately, moving from an Advantage plan to a Supplement later can be difficult, as you must go through underwriting, and many can't meet the requirements."

Medicare Advantage vs. Medicare Supplement

How do Medicare Advantage plans differ from Medicare Supplement plans?

The two plan types work in fundamentally different ways:

Medicare Advantage replaces Original Medicare. A private insurer manages your benefits, and you typically get extras like drug coverage and dental/vision. You use the plan's provider network and follow its rules for referrals and prior authorization.

Medicare Supplement (Medigap) works alongside Original Medicare. You keep Original Medicare and add a Supplement plan to help cover out-of-pocket costs like deductibles, copayments, and coinsurance. Medigap plans don't include drug coverage or extra benefits, but they let you see any provider that accepts Medicare with minimal cost-sharing. Learn more about Medicare Supplement coverage in detail.

The trade-off: Medicare Advantage usually costs less upfront but can cost more when you need care. Medigap has higher premiums but more predictable costs. For a side-by-side breakdown, try our comparing Medicare plans checklist.

Neither plan type is universally better for New Jersey residents. "In my personal opinion, there are no 'bad' plan types. Medicare Advantage and Medigap are simply two different ways to navigate the healthcare system once you move into Medicare," says Matt Maresch, a licensed Medicare agent in Texas. "Medicare Advantage may work well for someone who is comfortable using a plan network and wants lower monthly premiums. Medigap may be a better fit for someone who wants more flexibility with doctors and hospitals, is comfortable paying a higher monthly premium, and wants to reduce out-of-pocket uncertainty. A good agent should be able to explain both options clearly, review your doctors and prescriptions, and explain why they are recommending one path over the other."

Can I switch from a Medicare Supplement plan to a Medicare Advantage plan in New Jersey?

Yes. You can drop your Medigap plan and enroll in Medicare Advantage during the Annual Election Period (October 15 - December 7). For a complete walkthrough of switching in either direction, see our guide on how to switch from Medicare Advantage to Medigap and vice versa.

Before switching, understand the risk: if you later want to return to Medigap, most states allow insurers to use medical underwriting. That means your health history could result in higher premiums or denial of coverage. Only a few states guarantee the right to buy Medigap regardless of health status. Check your state's Medigap enrollment rules before making the move.

Can I have both a Medicare Advantage plan and a Medicare Supplement plan?

No. New Jersey residents cannot have a Medicare Advantage plan and a Medicare Supplement plan at the same time. Medicare Advantage replaces Original Medicare, while Medigap supplements Original Medicare. Since Medigap only works with Original Medicare, it serves no purpose if you're enrolled in a Medicare Advantage plan.

If you have a Medicare Advantage plan and want the cost predictability of Medigap, you can switch back to Original Medicare during the Annual Election Period and then apply for a Supplement plan. Medical underwriting may apply depending on your state and when you originally enrolled.

These are some of the most common questions New Jersey residents ask about Medicare Advantage, but every situation is different. A licensed Medicare agent can walk you through your specific options at no cost to you.