Lucie Health Marketplace

Health insurance

Mar 20, 2026

Everything You Need to Know About Open Enrollment Period for Health Insurance

By The Lucie Team

Key takeaways

  • Open enrollment is the main window each year to sign up for ACA Marketplace health insurance or change your plan.
  • In most states, open enrollment runs from November 1 to December 15.
  • Enroll by December 15 to have coverage that starts on January 1. If you enroll after December 15, coverage starts February 1.
  • Miss open enrollment, and you’ll usually need a qualifying life event (like getting married or having a baby) to enroll.
Health insurance shopping has a season. It’s called open enrollment period (OEP), and it’s the main time each year when you can sign up for an Affordable Care Act (ACA) Marketplace plan or switch the one you already have.
Miss the window, and you’ll usually need a qualifying life event—like losing coverage or moving—to enroll. In this guide, we’ll walk through when open enrollment happens, how it works, and what to do before the deadline sneaks up on you.

What is open enrollment period?

Open enrollment period is the yearly window when you can sign up for health insurance through the ACA Marketplace. The ACA Marketplace is the online platform where individuals and families can compare health plans, see if they qualify for financial help, and enroll in coverage.
During open enrollment, you can:
  • Sign up for a new health insurance plan
  • Switch to a different Marketplace plan
  • Update your coverage if your needs or income have changed
In most states, open enrollment runs from November 1 through December 15.
Miss that window, and things get a little trickier. Outside of open enrollment, you usually can’t sign up for Marketplace coverage unless you qualify for a special enrollment period (more on those shortly).

When is open enrollment period for my state?

For 2027 health coverage, open enrollment starts November 1, 2026.
In most states, you’ll have until December 15, 2026, to choose a plan. But some states run their own health insurance marketplaces, which means they can extend the deadline slightly. But there are still limits:
  • Enrollment must start by November 1
  • It can’t go past December 31
  • The enrollment period can’t last longer than nine weeks total
In practice, this means the exact deadline may vary depending on where you live. But the most important thing to remember? Most people will need to choose a plan sometime between November and mid-December.

Who can enroll in a Marketplace plan?

Most people who buy their own health insurance can enroll in a Marketplace plan during open enrollment. In general, you’re eligible if you:
  • Live in the United States
  • Are a U.S. citizen or are lawfully present in the country
  • Are not incarcerated
  • Are not enrolled in Medicare
You also don’t need to be unemployed to use the Marketplace. Many people enroll because they’re self-employed, freelancing, between jobs, or working somewhere that doesn’t offer health benefits.
One important thing to know: Being eligible to enroll isn’t the same as qualifying for financial help. Subsidies depend on additional factors like your income and whether you have access to coverage through an employer.

Can you get financial help during open enrollment period?

Possibly — and for most people, the answer is yes. In fact, for the 2025 plan year, about 90% of people who enroll in Marketplace coverage qualify for financial help that lowers the cost of their health insurance.
These savings are based mainly on your household income and are only available if you enroll through the ACA Marketplace. There are two main types of financial help:
The good news? You don’t have to do the math yourself. When you apply, Lucie automatically calculates any estimated savings you may qualify for and shows your discounted monthly price before you choose a plan.

How to enroll during open enrollment period

Let’s be honest: Shopping for health insurance is confusing. Premiums, deductibles, metal tiers, provider networks — it’s a lot to sort through, especially if you’re seeing it all for the first time.
You can enroll completely on your own through the ACA Marketplace website for your state. Many people do. But the process can involve comparing dozens of plans, interpreting insurance jargon, and trying to figure out what your costs might actually look like over the year.
That’s where tools designed to simplify the process can help. Lucie is a free tool that helps you find the right plan for your life and enroll in coverage with much more clarity.
You can use Lucie however you prefer (all at no cost to you): Online or over the phone with our affiliate’s licensed insurance brokers.
The goal is simple: help you make a confident decision without needing a crash course in health insurance.

What happens if you miss open enrollment period?

Miss the open enrollment deadline? You’ll usually have to wait until the next one to sign up for Marketplace coverage.
But there’s a catch (a good one): Life happens, and the ACA accounts for that.
If you experience certain major life events, you may qualify for a special enrollment period, which lets you enroll outside the normal window. Most of these events give you about 60 days to enroll in a Marketplace plan.
Common qualifying events include:
  • Losing other qualifying health coverage
  • Moving to a new state
  • Getting married or divorced
  • Having or adopting a child
  • Changes in your household income that affect the coverage you qualify for

Bottom line

Open enrollment is health insurance’s once-a-year shopping window. For most people, it runs November 1 through December 15. It’s when you can sign up for coverage, switch plans, or see if you qualify for savings. Miss it, and you’ll usually need a qualifying life event to enroll later.

Frequently asked questions (FAQs)

Is there a penalty for not having health insurance?

Not at the federal level. The federal penalty for going without insurance was eliminated in 2018.
However, a few states still have their own coverage rules. So if you live in one of these places, you may need health insurance or pay a penalty when filing state taxes:
  • California
  • Massachusetts
  • New Jersey
  • Rhode Island
  • Washington, DC
Everyone else? No fine for being uninsured.

Should I let my Marketplace plan auto-renew?

Most Marketplace plans will automatically renew if you don’t make changes during open enrollment. That’s helpful — it means you won’t suddenly lose coverage.
But here’s the catch: Plans, premiums, and subsidies change every year. A plan that made sense last year might not be the best deal this year. So while it might be tempting to set it and forget it, auto-renewal isn’t always your best move.
Quick rule of thumb: Let auto-renewal be your safety net, not your strategy. Take a few minutes during open enrollment to make sure your current plan still works for you.

Can I enroll in a Marketplace plan if I have Medicare?

Short answer: No. If you’re enrolled in Medicare, you generally can’t sign up for a Marketplace plan.
The ACA Marketplace is meant for people who don’t have coverage through Medicare or an employer. So once Medicare enters the picture, your options typically shift to Medicare and Medicare supplement plans, not Marketplace coverage. Put simply, Medicare and the Marketplace live in two different worlds.

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