Medicare Advantage or Medigap? How to choose in New Jersey

Every fall, Medicare beneficiaries in New Jersey face the same question. Stay with Original Medicare and a Medigap policy, or go with a Medicare Advantage plan? The ads focus on free extras. The bigger questions are how you want to pay for care and how much freedom you want in picking doctors.

Medicare Open Enrollment runs October 15 to December 7, 2026. Any change you make takes effect January 1, 2027. Here is how to think it through.

What is the basic difference?

Path one: Original Medicare plus Medigap plus Part D. Medicare itself pays your doctor and hospital bills. A Medigap policy from a private insurer picks up some or all of what Medicare leaves behind. That can include the Part A deductible and the 20% coinsurance on Part B services. A separate Part D plan covers prescriptions. You can see any doctor or hospital in the country that accepts Medicare. No referrals are needed.

Path two: Medicare Advantage (Part C). A private insurer approved by Medicare covers your Part A and Part B services, and usually your drugs, in one plan. Most plans use networks. Many add dental, vision or hearing benefits and gym memberships. Every Advantage plan has a yearly limit on what you pay out of pocket for covered services.

	Original Medicare + Medigap + Part D	Medicare Advantage
Monthly premiums	Higher (Part B + Medigap + Part D)	Often low or $0 on top of Part B
Costs when you use care	Low and predictable, depending on the Medigap plan	Copays and coinsurance, up to the plan's yearly limit
Choice of doctors	Any provider nationwide that takes Medicare	Usually a network; out-of-network care costs more or is not covered
Prior authorization	Rare	Common for scans, surgery, rehab and some drugs
Extras (dental, vision, hearing)	Not included	Often included, with limits
Switching later	Easy to switch drug plans each fall	Easy to switch plans, but moving back to Medigap can be hard

Neither path is right for everyone. A healthy 66-year-old in Toms River with two generic prescriptions may be happy with a low-premium Advantage plan. A 72-year-old in Montclair who sees specialists in Manhattan may value Medigap's freedom more than the premium savings.

What makes Medigap different in New Jersey?

Your six-month window matters most

Federal law gives you a one-time Medigap Open Enrollment Period. It lasts six months and starts the first month you are both 65 or older and enrolled in Part B. During it, any company selling Medigap in New Jersey must sell you any of its policies at its standard rate, whatever your health.

After that window closes, insurers in New Jersey may ask health questions and can turn you down or charge more. Some states give people a yearly chance to switch Medigap plans around their birthday. As of 2026, New Jersey is not one of them. That is why the first decision carries so much weight here.

Guaranteed issue rights later on

You can still buy Medigap without health questions in certain situations. These include your Advantage plan leaving your area, you moving out of its service area, or an employer ending retiree coverage completely. There is also a trial right. If you drop a Medigap policy to try Medicare Advantage for the first time and leave within the first year, you can generally get Medigap back. The same applies if you joined an Advantage plan when you first got Medicare at 65 and leave within 12 months.

Rules for people under 65

Federal law does not guarantee Medigap to people on Medicare because of a disability. New Jersey goes further:

• Ages 50 to 64: any insurer that sells Medigap to people 65 and over must also offer a policy to people who became eligible for Medicare on or after their 50th birthday. For people who became eligible on or after January 1, 2020, that is Plan D. You must apply within 12 months of enrolling in Part B. The premium cannot be higher than the company charges someone who is 65.
• Under 50: Horizon Blue Cross Blue Shield of New Jersey is the state's contracted carrier and must issue Plan D to eligible applicants who apply within 12 months of starting Part B. Horizon's number for this plan is 1-877-234-1240.
• At 65: you get a fresh six-month Medigap Open Enrollment Period and can buy any Medigap plan from any insurer in the state.

New Jersey SHIP publishes current Medigap rate charts for age 65, ages 50 to 64 and under 50. On the September 2026 chart for ages 50 to 64, Horizon's Plan D was $179.92 a month for women and $194.16 for men. Rates change, so always confirm with the company.

Will my doctors and hospitals be covered?

This is where New Jersey is different from most states. Many residents get care across the river. North Jersey families often use New York City hospitals. South Jersey families often use Philadelphia health systems.

With Original Medicare, any doctor or hospital in the United States that accepts Medicare will take you. Your Medigap policy follows along. That freedom is a big reason Medigap is popular with people who see out-of-state specialists or spend winters in Florida.

With Medicare Advantage, the network is everything. Watch for these details:

• HMO plans generally cover only in-network care, except emergencies and urgent care. Many require referrals to see specialists.
• PPO plans pay something for out-of-network care, at a higher cost to you.
• Out-of-state systems may be in some New Jersey plans and not others. A plan can include a hospital but leave out the doctors who practice there.
• Networks change. A doctor in the plan this year may leave next year. Plans can also change benefits each January.

Do not rely on a sales flyer. Call each doctor's billing office and ask: "Are you in network for [exact plan name] for 2027?" Then check the plan's online directory too.

How do I use the Medicare Plan Finder?

The Medicare Plan Finder is the official comparison tool. It shows every Part D and Medicare Advantage plan in your ZIP code with estimated yearly costs.

Stuck? A SHIP counselor will run Plan Finder with you for free at 1-800-792-8820. You can also call Medicare at 1-800-633-4227.

What if I change my mind?

You have more than one chance each year.

• Medicare Open Enrollment, October 15 to December 7. Anyone can switch Advantage plans, move between Advantage and Original Medicare, or change Part D plans. Changes start January 1.
• Medicare Advantage Open Enrollment, January 1 to March 31. Only for people already in an Advantage plan. You get one change: move to a different Advantage plan, or leave Advantage for Original Medicare and add a Part D plan. The change starts the first of the next month.

Here is the catch. Leaving Advantage during either window does not by itself give you a right to buy Medigap in New Jersey. Unless your trial right or another guaranteed issue situation applies, the insurer can ask health questions. Before you drop an Advantage plan, apply for the Medigap policy and wait for approval.

What questions should I ask before I enroll?

• Are all my doctors and my preferred hospitals in network for next year, by name?
• What is the yearly out-of-pocket limit, and what would a hospital stay cost me?
• Which services need prior authorization? How do I appeal a denial?
• Are all my drugs on the formulary? What tier, and are there quantity limits or step therapy rules?
• What do the dental, vision and hearing benefits really cover, and what is the dollar cap?
• Does the plan cover care when I travel or spend winters out of state?
• For Medigap: which plan letter, and how has this company raised rates in recent years?
• Am I in a guaranteed issue window right now, or will I face health questions?

New to Medicare this year? Start with our Medicare 101 guide. If premiums are a strain, PAAD and Senior Gold may help.

Common questions

When can I switch from Medicare Advantage back to Original Medicare?

During Medicare Open Enrollment (October 15 to December 7) or the Medicare Advantage Open Enrollment Period (January 1 to March 31). Getting a Medigap policy is a separate step, and outside a guaranteed issue situation the insurer in New Jersey may ask health questions.

Does New Jersey have a Medigap birthday rule?

No. As of 2026 New Jersey does not give a yearly birthday window to switch Medigap plans without health questions. Your six-month Medigap Open Enrollment Period at 65 is the key window.

I am on Medicare due to disability and I am 58. Can I buy Medigap?

Yes. In New Jersey, insurers that sell Medigap must offer Plan D to people who became eligible at 50 to 64, if you apply within 12 months of starting Part B. The premium cannot exceed what the company charges a 65-year-old.

Can I use New York or Philadelphia hospitals?

With Original Medicare, yes, at any hospital that accepts Medicare. With a Medicare Advantage plan, it depends on the plan's network. Confirm each hospital and doctor by name with the plan before you enroll.

This guide is for general information. Program rules and income limits change, so confirm with the official source before you apply.