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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Click to call 855-729-3240Key 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:
- Your Medicare Advantage plan leaves your area or you move out of its service area.
- You joined a Medicare Advantage plan when you first became eligible and want to switch back to Original Medicare within 12 months (the "trial right").
- Your Medigap insurer goes bankrupt or you lose coverage through no fault of your own.
- Your employer or union retiree coverage ends.
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:
- Birthday rules — a window around your birthday to switch to an equal or lesser Medigap plan without underwriting.
- Anniversary rules — a similar window tied to the date you first bought your current policy.
- Continuous or year-round open enrollment — some states require insurers to accept applicants without health questions at any time.
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.
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
(MA penetration in Essex County)
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
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When can you enroll? An interactive year
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?
If I'm turned down for a new Medigap policy, do I lose my current one?
Does moving from Medicare Advantage back to Original Medicare guarantee me a Medigap plan?
Where can I get help specific to my situation in New Jersey?
- 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.