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Medicare Supplement

Medigap Switch Rules Federal Law and NJ Add

BLOOMFIELD, N.J. — If you already have a Medicare Supplement (Medigap) policy and you're wondering whether you can move to a different one, the honest answer is: it depends on when you try and why. Federal law protects your right to switch in a handful of specific situations. Outside those windows, the insurer you're applying to can usually look at your health history before saying yes — and that single fact changes everything about how, and when, people shop.

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Senior woman reading a guide at home in Bloomfield — illustrating this Medicare guideMedicare SupplementBloomfield, NJ
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Key takeaways

  • Outside of your one-time Medigap Open Enrollment Period, insurers in most states can use medical underwriting when you apply to switch policies.
  • Federal "guaranteed-issue" rights let you buy certain Medigap plans without health questions in specific situations, such as losing other coverage through no fault of your own.
  • Some states add extra protections — like a birthday rule, an anniversary rule, or year-round open enrollment — so New Jersey residents should confirm current state rules with SHIP or the state Department of Banking and Insurance.
  • Medigap is separate from Medicare Advantage; the fall Annual Enrollment Period (Oct. 15–Dec. 7) does not, by itself, give you the right to switch Medigap plans.

Here's what Bloomfield readers should understand before they pick up the phone.

The one window everyone gets: your Medigap Open Enrollment Period

When you first turn 65 and enroll in Medicare Part B, a six-month Medigap Open Enrollment Period begins. During those six months, any Medigap policy sold in your state is available to you at the best available rate the insurer offers, regardless of your health history.

This window happens once. Miss it, and in most cases you're in underwriting territory for any future switch.

What "medical underwriting" actually means

Underwriting means the insurance company can ask about your health, review your prescriptions, and decide whether to accept you, charge you more, or turn you down. It is legal in most states once your initial six-month window closes.

That is why so many people who already have a Medigap policy stay put — not because their plan is perfect, but because moving to a different one may require passing a health review.

Federal guaranteed-issue rights: the situations where insurers can't ask

Federal law lays out several "guaranteed-issue" situations. In these cases, certain Medigap policies must be sold to you without health questions, usually within 63 days of the triggering event. The most common triggers include:

These federal rights are the same nationwide, but the specific plan letters you can buy under them are limited. Details are on Medicare.gov under "Medicare Supplement Insurance (Medigap)."

The state layer: birthday rules, anniversary rules, and continuous open enrollment

A growing number of states have added their own switching protections on top of the federal rules. You may have heard of:

Do these apply in New Jersey? That is exactly the kind of question to confirm directly, because state rules change and details matter. Bloomfield residents can contact New Jersey's State Health Insurance Assistance Program (SHIP), known locally as SHIP-NJ, or the New Jersey Department of Banking and Insurance to check what's currently in force. Neighboring states have different rules, so what a friend in another state did may not apply here.

A practical way to think about timing

Before you apply anywhere:

1. Write down the date your Part B started and the date you bought your current Medigap policy. 2. Note whether any of the federal guaranteed-issue triggers apply to you right now. 3. Ask SHIP whether any New Jersey rule gives you a switching window you didn't know about. 4. Only then compare policies — because knowing whether you'll face underwriting changes which plans are realistic options.

Bloomfield is in Essex County, and while Medicare Advantage plan availability is set at the county level, Medigap is regulated at the state level. So the rules that matter for switching a Medigap policy are New Jersey rules, not Essex County rules.

By the numbers

Medicare Part B premium, 2006–2026

The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.

$0$50$100$150$200200820122016202020242026

Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.

By the numbers

How people get Medicare in Essex County

50% are on Medicare Advantage
(MA penetration in Essex County)
50%
50%
Medicare Advantage Medicare Supplement (Medigap) Original Medicare only
U.S. average

MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.

Key dates

Medicare enrollment periods at a glance

  • Around your 65thInitial Enrollment PeriodA 7-month window around the month you turn 65 — your first chance to sign up.
  • October 15 – December 7Annual Enrollment PeriodAnyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan.
  • January 1 – March 31Medicare Advantage Open EnrollmentIf you're already in a Medicare Advantage plan, you can make one change.
  • January 1 – March 31General Enrollment PeriodFor people who missed their first chance to sign up for Part B.
  • VariesSpecial Enrollment PeriodTriggered by life events like moving or losing other coverage.

Dates are set by Medicare and apply nationwide. Confirm your personal windows at Medicare.gov or 1-800-MEDICARE.

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The parts of Medicare

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.

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When can you enroll? An interactive year

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October 15 – December 7 — anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan. Changes take effect January 1.

Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.

Good to know

Frequently asked questions

Can I switch Medigap plans during the fall Annual Enrollment Period?
The Oct. 15–Dec. 7 window is for Medicare Advantage and Part D changes. It does not automatically give you the right to switch Medigap policies. You can apply for a new Medigap policy at any time of year, but outside of a protected window the insurer can usually use medical underwriting.
If I'm turned down for a new Medigap policy, do I lose my current one?
No. Your current Medigap policy stays in force as long as you keep paying the premium. That's why many advisors suggest getting approval on a new policy before canceling an existing one.
Does moving from Medicare Advantage back to Original Medicare guarantee me a Medigap plan?
Sometimes. If you're within your 12-month "trial right" after first joining Medicare Advantage, you generally have a guaranteed-issue right to certain Medigap plans. Outside that window, it depends on whether another federal or state protection applies.
Where can I get help specific to my situation in New Jersey?
Call 1-800-MEDICARE, visit Medicare.gov, or contact SHIP-NJ for free, unbiased counseling. For questions about how insurers must behave in the state, the New Jersey Department of Banking and Insurance is the right stop. ## Where to go from here Medigap switching rules reward people who slow down and check the calendar before they shop. Start with Medicare.gov's Medigap pages, then call SHIP for a one-on-one review of your options. The right answer for a Bloomfield reader is almost always shaped by dates — Part B start date, policy anniversary, and any state windows currently on the books — rather than by any single plan's features.
Sources & further reading
  • CMS — Medicare Supplement Insurance (Medigap) rules (medicare.gov)

For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.

Also for Bloomfield

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This page was last updated: September 2026.

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