Every fall, “open enrollment” arrives — but there is no single open enrollment. There are three separate windows, for three different kinds of coverage, with three different sets of rules, and they overlap in ways that confuse almost everyone. Missing the window that applies to you can lock in the wrong coverage for a full year, and this year the stakes are higher than usual: drug-plan costs are rising, several large insurers are dropping plans, and New Jersey individual-market premiums are jumping by an average of nearly twenty percent before subsidies. Here is each window, who it is for, and what you can actually do in it.
Window One: Medicare Open Enrollment — October 15 to December 7
This is the main event for anyone already on Medicare. If you are enrolled in Medicare Parts A or B, a Medicare Advantage plan, or a Part D prescription drug plan, this is your annual opportunity to change that coverage for 2027. Any change you make takes effect January 1, 2027.
People in Original Medicare can stay put, switch to a different stand-alone drug plan, or join a Medicare Advantage plan. People in Medicare Advantage can switch to a different Advantage plan or go back to Original Medicare, pairing it with a stand-alone drug plan. Doing nothing is also a choice — your current coverage simply continues — but it is a choice worth making deliberately, because plans change their premiums, provider networks, and drug formularies every year, and 2027 brings more change than most.
If your plan is being discontinued, you will get a notice — do not ignore it, because a plan termination also opens a special enrollment period, discussed below.
Window Two: Medicare Advantage Open Enrollment — January 1 to March 31
This second window is the one most often confused with the first, so let me be precise: it is not the same as the fall window, and it is not open to everyone. From January 1 through March 31, only people who are already enrolled in a Medicare Advantage plan can use it — to switch to a different Advantage plan, or to leave Medicare Advantage, return to Original Medicare, and pick up a stand-alone drug plan. If you are in Original Medicare, this window does nothing for you; you cannot use it to join an Advantage plan. Think of it as a limited second chance for Advantage members who picked a plan in the fall and discovered in January that its network or drug coverage does not work for them.
Window Three: The Marketplace — Get Covered New Jersey, November 1 to January 31
The third window is for people who do not have Medicare. New Jersey runs its own marketplace, Get Covered New Jersey, and its open enrollment for 2027 coverage runs from November 1, 2026 through January 31, 2027. Enroll by December 31 for coverage starting January 1; enroll at any point in January for coverage starting February 1. Note that New Jersey’s window is longer than the federal one used in most states, which ends January 15 — a federal rule that would have forced states to shorten their windows was vacated in court, and New Jersey kept its three months.
Two warnings belong here. First, shop carefully this year: final 2027 rates in New Jersey’s individual market are up a weighted average of 19.8 percent before subsidies, driven by rising medical and drug costs and by Congress’s failure to renew the enhanced premium tax credits that had kept marketplace coverage cheaper. Many people will pay less than that headline figure if they qualify for state or remaining federal assistance, but the increase is real, and it varies widely by insurer. Second, the tax credit rules themselves are changing for immigrants. As I detailed in my post on Medicaid eligibility for lawfully present immigrants, the recent federal law narrowed immigrant eligibility across these programs; beginning January 1, 2027, marketplace tax credits are largely limited to U.S. citizens, green card holders, certain Cuban and Haitian entrants, and people from Compact of Free Association nations, and many lawfully present immigrants — including refugees and asylees — lose credit eligibility altogether. Applications for NJ FamilyCare (Medicaid), unlike marketplace coverage, can be filed year-round.
One more caution, because I see the mistake made: if you are approaching Medicare eligibility, do not use marketplace coverage as a reason to delay enrolling in Medicare. Marketplace coverage does not postpone your Medicare enrollment deadlines, and delaying can leave you with permanent late-enrollment penalties and a bill for credits you should not have received.
Outside the Windows: Special Enrollment Periods
Life does not always change on a schedule, so the system has escape hatches. Losing Medicaid or other coverage, moving, getting married, and similar life events can open a special enrollment period outside the annual windows. If your Medicare Advantage or drug plan leaves your area, you get a special enrollment period running from December 8 through the end of February to choose new coverage. People enrolled in both Medicare and Medicaid, people receiving the Part D Low Income Subsidy (Extra Help), and people living in nursing homes have additional flexibility — Extra Help recipients, for example, can switch stand-alone drug plans on a monthly basis rather than waiting for a window.
Before You Choose: Free Help, and a Check for Savings
Open enrollment is also the right time to make sure you are enrolled in every program you qualify for, because many people are paying more than they should. Extra Help can cut Part D drug costs substantially for people with limited income, and the Medicare Savings Programs can pay your Part B premium outright — the Qualified Medicare Beneficiary program covers premiums and cost-sharing for those who qualify, a subject I covered in my post on when New Jersey Medicaid pays your Part B premium. Hundreds of thousands of Extra Help recipients nationwide pay a monthly drug-plan premium simply because they are not in one of the plans that is premium-free for them; open enrollment is the time to fix that.
I do not advise clients on which Medicare plan to pick — that is not my role, and it should not be an insurance agent’s either. New Jersey has a free, unbiased resource for exactly that: the State Health Insurance Assistance Program, NJ SHIP, at 1-800-792-8820, staffed by trained counselors who know the plans in your county and have nothing to sell you. For marketplace coverage, the Get Covered New Jersey call center (1-833-677-1010) can answer questions, and its “Find Local Assistance” tool on the Get Covered New Jersey website connects you with free certified assisters near you. Whichever route you use, save your enrollment confirmation — and if you enroll by phone, write down the date, time, and the representative’s name. Finally, a scam warning that bears repeating every year: Medicare will never call you to sell you a plan or ask for your Medicare number. Anyone who does is not a Medicare representative.
The windows again, in one breath: Medicare changes by December 7, the Advantage second chance runs January 1 to March 31, and Get Covered New Jersey stays open until January 31, with December 31 as the date to beat for January 1 coverage. The fall window closes first — if you are on Medicare, start there.