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How Medigap Fills the Gaps: Your Bridge Over Medicare Costs

By New Jersey Medicare Advisory • June 4, 2026

The Hand-Off: How Medicare and Medigap Process Your Claims

Imagine you're at a hospital getting a necessary procedure. When the bills start flowing, you might wonder: who pays what, and in what order? This isn't just curiosity—understanding the payment sequence between Original Medicare and your Medigap policy can help you verify your claims are processed correctly and avoid billing headaches.

The good news? Once you understand this coordination, you'll see why thousands of New Jersey Medicare beneficiaries choose this combination for their health coverage.

Original Medicare Always Goes First

Here's the fundamental rule: Original Medicare (Parts A and B) is always the primary payer. Your Medigap policy is secondary and only steps in after Medicare has processed the claim.

When you receive a covered service, Medicare receives the claim first. Medicare then pays its share according to its coverage rules. After Medicare makes its payment decision, the remaining balance—which might include deductibles, coinsurance, or copayments—automatically gets forwarded to your Medigap insurance company.

You typically don't need to file a separate claim with your Medigap insurer. This automatic crossover makes the process seamless for most beneficiaries. The coordination happens behind the scenes between Medicare and your Medigap carrier, which is one reason why Medigap policies are often called "Medicare Supplement" insurance—they literally supplement what Medicare pays.

What Medigap Covers After Medicare Pays

Once Medicare has paid its portion, your Medigap policy covers specific out-of-pocket costs based on your plan letter (like Plan G or Plan N). These standardized plans cover different combinations of:

  • Medicare Part A and Part B deductibles
  • Part A coinsurance for hospital stays
  • Part B coinsurance or copayments for doctor visits and outpatient services
  • The first three pints of blood needed in a medical procedure
  • Part A hospice care coinsurance
  • Skilled nursing facility coinsurance
  • Foreign travel emergency coverage (on most plans)

The key advantage here is predictability. When you know what your specific Medigap plan covers, you can better estimate your annual healthcare costs. Unlike Original Medicare alone—where your 20% coinsurance could theoretically be unlimited—Medigap plans put a ceiling on your exposure.

Understanding What Falls Outside This Partnership

It's equally important to know what neither Original Medicare nor Medigap covers. This partnership doesn't include:

  • Prescription drug coverage (you'll need a separate Part D plan)
  • Dental care beyond what's medically necessary
  • Vision care, including eyeglasses
  • Hearing aids
  • Long-term custodial care

Many New Jersey residents are surprised to learn they need three separate policies for comprehensive coverage: Original Medicare (Parts A and B), a Medigap policy, and a Part D prescription drug plan. Each serves a distinct purpose in your healthcare coverage strategy.

Additionally, Medigap only works with Original Medicare. If you're enrolled in a Medicare Advantage plan (Part C), you cannot use a Medigap policy—and in fact, it's illegal for insurance companies to sell you one while you're in a Medicare Advantage plan.

Timing and Enrollment Matter for Seamless Coverage

The coordination between Original Medicare and Medigap only works smoothly when you're properly enrolled in both. Your Medigap Open Enrollment Period—the six months starting the month you turn 65 and enroll in Part B—offers you guaranteed issue rights. During this window, insurance companies cannot deny you coverage or charge higher premiums based on health conditions.

If you wait to purchase Medigap outside this window, you may face medical underwriting in New Jersey, potentially resulting in higher premiums or coverage denials based on pre-existing conditions.

Get Personalized Guidance for Your Situation

While Medigap policies are standardized by letter, your personal healthcare needs, budget, and circumstances are unique. Understanding how these policies work alongside Original Medicare is just the beginning—choosing the right plan requires looking at your specific situation.

The licensed advisors at New Jersey Medicare Advisory can walk you through how different Medigap plans would work with your Original Medicare coverage, helping you find the right fit for your needs. Call us today at 856-221-7051 for a no-obligation consultation tailored to your circumstances.