Special enrollment period
A window outside of open enrollment when you can sign up for or change health insurance, triggered by a qualifying life event.
Last reviewed August 23, 2026
Definition
A Special Enrollment Period (SEP) is a limited time window outside of open enrollment during which you can enroll in, change, or drop health insurance coverage. SEPs are triggered by qualifying life events: major life changes like getting married, having a baby, or losing employer-sponsored insurance.
For employer-sponsored plans: SEPs are generally 30 days from the qualifying life event. Some employers extend this to 60 days.
For marketplace (ACA) plans: SEPs are generally 60 days from the qualifying event. Some events (like losing Medicaid eligibility) have different timelines.
Why SEPs matter: Without an SEP, you're locked into your current coverage (or no coverage) until the next open enrollment period. Missing your SEP window means potentially going uninsured or waiting months to make necessary changes.
Important: You can't use an SEP preemptively. The qualifying event has to actually occur, and documentation is required, so you can't simply claim you had one.
Losing job-based coverage opens an SEP and starts the COBRA clock at once. COBRA vs. marketplace insurance covers how the two deadlines overlap.
Examples
You have a baby in July. This triggers a 30-day SEP to add your child to your employer's health plan. Miss the 30 days and your child may go uncovered until open enrollment.
You move from New York to Texas in September. Leaving your plan's coverage area is a qualifying event, so you have 60 days to find new marketplace coverage in Texas.
You lose your job in March. The loss of employer coverage gives you 60 days to enroll in a marketplace plan. If you also elect COBRA, you can switch to a marketplace plan during open enrollment or with another qualifying event.
Frequently asked questions
Can I enroll in any plan during my SEP?
For marketplace plans, you can choose any plan available in your area. For employer plans, you're generally limited to the plan options your employer offers.
Do I lose my SEP if I don't act immediately?
Your SEP lasts for a set window (30 or 60 days). You can enroll or make changes anytime within that window, so you don't have to act on day 1. But once the window closes, you lose the opportunity.
What if I miss my SEP?
If you miss your SEP window, your options are limited. You may be able to apply for Medicaid if you qualify. Otherwise, you'll generally need to wait until the next open enrollment period, unless another qualifying event occurs.
Related terms
Open enrollment
The annual period during which employees can enroll in, change, or cancel employer-sponsored benefits.
Premium
The recurring payment you make, monthly, quarterly, or annually, to maintain an insurance policy.
COBRA
A federal law that lets you keep your employer-sponsored health coverage for a limited time after leaving a job, at your own expense.
Qualifying life event
A major life change, such as marriage, having a baby, or losing job-based insurance, that allows you to change your health coverage outside of open enrollment.
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