Outside open enrollment (November 1 to January 15 on HealthCare.gov), you can only enroll in or change a Marketplace plan if you qualify for a special enrollment period, usually because of a life change such as losing other coverage, moving, getting married or having a baby. Most of these give you 60 days to pick a plan, and you may have to send documents within 30 days of picking. The year-round SEP for people at or under 150% of the poverty level is no longer offered for 2027.
Key facts: HealthCare.gov says you generally qualify for an SEP if you lost qualifying coverage in the past 60 days or expect to lose it in the next 60 days (90 days for lost Medicaid or CHIP). · Voluntarily dropping COBRA or a parent's plan generally doesn't qualify you; losing it involuntarily or having COBRA run out does. · CMS's 2027 Payment Notice final rule keeps the 150% FPL monthly SEP off the table after plan year 2026, and federal law bars premium tax credits for plans picked through an income-only SEP starting in 2026.
Let's face it: open enrollment is the front door of the health insurance club, and it's only unlocked from November 1 to January 15. Miss it, and you're standing on the sidewalk hoping the bouncer likes your story.
That story is called a special enrollment period (SEP). Here's what gets you in, how long you have, and why the door now has an ID check.
The Front Door Is Still Open (Seriously, Use It While You Can)
Before anything else: HealthCare.gov's calendar says open enrollment runs November 1 to January 15. Enroll by December 15 for coverage starting January 1. Enroll December 16 through January 15 and coverage starts February 1.
After January 15, you can only enroll or switch plans if you qualify for an SEP. (Medicaid and CHIP are the exception: you can apply any time, all year.) If your state runs its own marketplace, check its site, because the dates there may differ.
Life Events That Unlock the Side Door (Your Wedding Finally Pays for Something)
HealthCare.gov's SEP page sorts the qualifying events into a few buckets. Most of them look back 60 days.
- Got married. Pick a plan by the last day of the month and coverage can start the first of the next month. Romance, but with a billing cycle.
- Had a baby, adopted, or placed a foster child. Coverage can start the day of the event, even if you enroll up to 60 days later. Babies get the VIP list.
- Moved to a new ZIP code or county, to the U.S. from abroad or a territory, or to or from school, seasonal work, or a shelter.
- Other changes, like becoming a U.S. citizen, leaving incarceration, or getting hit by a natural disaster.
The fine print has teeth, though. Divorce counts only if you also lost health coverage. Moving just for medical treatment, or staying somewhere on vacation, doesn't count. Your two weeks in Cabo is not a "change in residence," no matter how spiritually it felt like one.
Losing Coverage: The Most Common Way In (Getting Dumped Counts; Dumping Doesn't)
The biggest bucket is losing other coverage. HealthCare.gov says you may qualify if you lost qualifying coverage in the past 60 days or expect to lose it in the next 60. If it was Medicaid or CHIP, you get 90 days.
That includes losing job-based coverage, aging off a parent's plan at 26, and your individual plan being discontinued. But it's a breakup rule, and the system cares who did the breaking:
- COBRA runs out or ends involuntarily? You qualify.
- You quit COBRA or stop paying it yourself? You don't.
- You drop a parent's plan on purpose? Generally no, unless your household income dropped or the change made you eligible for Marketplace savings.
- You lose only Part B or Part D? No SEP for you.
The timing also matters. If you already lost coverage, HealthCare.gov says coverage starts the first of the month after you pick a plan. See it coming? Pick a plan up to 60 days early and coverage can start the month after the old plan ends. Miss the window and you wait for the next open enrollment, unless another life event shows up.
The ID Check at the Door (Uncle Sam Would Like to See Some Paperwork)
After you apply, your Eligibility Notice may ask you to prove the life event. HealthCare.gov's advice is to pick a plan first, then send documents. You have 30 days after picking to do it. You can upload scans or photos, or mail copies (never originals).
No acceptable documents? You can send a letter of explanation. Turned down but think you qualify? You can appeal. It's a bouncer with a complaint form.
The check is getting stricter. CMS's 2027 Payment Notice fact sheet says exchanges on the federal platform must verify at least 75% of new SEP enrollments, and can now verify more kinds of SEPs than just loss of coverage.
The Year-Round Low-Income Door Got Bricked Up (No, It's Not Coming Back in 2027)
For a few years, people with household income up to 150% of the federal poverty level had a monthly SEP. If they qualified for premium tax credits, they could enroll any time. The 2027 Payment Notice final rule lays out how it ended:
- A June 2025 rule paused it from August 25, 2025 through the end of 2026.
- In July 2025, section 71304 of the tax law CMS calls the "Working Families Tax Cut" legislation said no premium tax credit is allowed for a plan picked through an income-only SEP, starting January 1, 2026.
- The 2027 rule, effective July 20, 2026, keeps exchanges from offering the 150% SEP in 2027 and beyond.
Low income still qualifies you for subsidies. It just no longer gets you in the door by itself. Healthinsurance.org notes that Medicaid stays open all year, and a few places run year-round programs, such as the Basic Health Programs in DC, Oregon and Minnesota for incomes up to 200% of poverty.
The Fine Print: Your coverage start date and the day you can actually use it aren't the same day. HealthCare.gov says you can't use SEP coverage until your eligibility is confirmed and you've paid your first premium to the insurer. If confirmation delays push past the start date, you may owe premiums for the months you missed. Paying them gets you "retroactive" coverage for bills after the start date. Translation: keep the receipts from that urgent care visit.
Beware the "Secret Door" Pitch (Spoiler: It's an Alley)
CMS's fact sheet says agents, brokers and web-brokers are now barred from tactics like offering cash to enroll, claiming you'll always get $0 premiums, and misstating deadlines. Anyone promising a no-life-event "special enrollment" is selling you an alley, not a door.
The Bottom Line (Know Your Event, Count Your Days)
Open enrollment is the easy way in. After January 15, you need a real life change, usually with a 60-day window, and you may need to prove it within 30 days of picking a plan. For 2027, low income alone won't open the door, and the paperwork check is getting tighter.
Your one move: if you need Marketplace coverage for 2027, enroll on HealthCare.gov or your state's marketplace by December 15, so it starts January 1 and you never have to talk to the bouncer at all.
Now go forth and enroll like the velvet rope was put up just for you, and the bouncer already knows your name.
This is general education with a side of snark, not personal health insurance, tax or legal advice, and it doesn't recommend any plan, insurer or agent. HealthCare.gov and your state marketplace have the final word on whether you qualify. No actual hippies were turned away in the making of this article.
Sources:
- HealthCare.gov: Special Enrollment Periods
- HealthCare.gov: When can you get health insurance? (dates and deadlines)
- HealthCare.gov: Send documents to confirm a Special Enrollment Period
- HealthCare.gov: Get or change coverage outside of Open Enrollment
- CMS: HHS Notice of Benefit and Payment Parameters for 2027 Final Rule (fact sheet, May 15, 2026)
- Federal Register: HHS Notice of Benefit and Payment Parameters for 2027 final rule (May 20, 2026)
- Healthinsurance.org: What happened to ACA's low-income special enrollment period? (updated May 26, 2026)
Frequently asked questions
Can I get ACA health insurance outside open enrollment?
Only if you qualify for a special enrollment period, usually because of a life change like losing other coverage, moving to a new ZIP code or county, getting married, or having or adopting a child. Medicaid and CHIP accept applications any time of year.
How long do I have to enroll after losing my job-based coverage?
HealthCare.gov says you can pick a plan within 60 days after the coverage ended, or up to 60 days before it ends if you know it's coming. If you lost Medicaid or CHIP, the window is 90 days.
Does dropping COBRA give me a special enrollment period?
Not if you drop it or stop paying on your own. HealthCare.gov says you qualify when COBRA runs out or ends involuntarily, such as when your former employer stops offering coverage.
Is the low-income special enrollment period still available?
No. The monthly SEP for people with income up to 150% of the federal poverty level was paused in August 2025, and CMS's 2027 Payment Notice final rule keeps exchanges from offering it after 2026. People at that income can still get subsidies if they enroll during open enrollment or through a life-event SEP.
