Can you get health insurance outside Open Enrollment?

Why Open Enrollment exists in the first place

Open Enrollment is the annual window when anyone can sign up for or switch marketplace plans without proving eligibility. The window exists to prevent people from waiting until they're sick to buy insurance. Outside that window, ACA marketplace enrollment is generally restricted to people who've had a qualifying life change.

Special Enrollment Periods

A Special Enrollment Period (SEP) is a 60-day window (from the date of the event) when you can enroll in or change ACA marketplace coverage. Same rules apply to most employer plans. Some SEPs allow you to enroll before the event, so coverage starts the day the old plan ends.

Qualifying life events that open an SEP

• Loss of coverage: job loss, COBRA ending, aging off a parent's plan, losing Medicaid, divorce.
• Household changes: marriage, divorce, birth, adoption, death in the household.
• Residence changes: moving to a new ZIP code or state, moving to/from a shelter or transitional housing, students moving for school.
• Change in eligibility: becoming a U.S. citizen, gaining lawful presence, income change that newly qualifies you for a subsidy.
• Other qualifying events: release from incarceration, leaving AmeriCorps or the Peace Corps, exceptional circumstances.

See HealthCare.gov's SEP page for the official list and required documentation.

Medicaid and CHIP — year-round enrollment

Medicaid (for adults and children) and CHIP (Children's Health Insurance Program) don't follow Open Enrollment — you can apply any time, and coverage generally starts within days if you qualify. Income limits vary by state and household size; states that expanded Medicaid cover adults up to 138% of the federal poverty level. HealthCare.gov automatically routes you to your state's Medicaid application if you appear eligible.

Private (off-exchange) plans — sometimes year-round

Some ACA-compliant off-exchange plans enroll year-round if the carrier allows it (rules vary by state and by product line). These plans skip the marketplace subsidy but keep the essential health benefits and pre-existing condition protections. A licensed broker can tell you what's actually available in your county this month — availability changes.

Short-term health insurance

Short-term medical (STM) plans enroll year-round and can start within days. They're cheaper because they're not ACA-compliant — they can deny you for pre-existing conditions, exclude maternity and mental health, and cap annual benefits. Federal rules limit initial short-term policies to a maximum of 4 months (with renewals capped at the same length), and some states restrict them further or ban them entirely. See our short-term plans guide for the honest trade-offs.

Employer coverage

If you start a new job, most employer plans give you a 30–60 day enrollment window as a new hire, regardless of the ACA calendar. Same for benefits changes tied to a qualifying life event at your current employer.

FAQ

What's the difference between Open Enrollment and a Special Enrollment Period?

Open Enrollment is an annual window (typically Nov 1 – Jan 15 on the federal marketplace) when anyone can enroll. An SEP is triggered by a qualifying life event and gives you 60 days.

Can I get an SEP just because I forgot to enroll during Open Enrollment?

No. Forgetting isn't a qualifying event. You'd need a legitimate life change or wait for the next Open Enrollment.

Do I need proof of my qualifying life event?

Yes, in most cases. HealthCare.gov and state exchanges will ask for documentation (termination letter, marriage certificate, lease, etc.).

How fast can coverage start?

For most SEPs, coverage starts the first day of the month after you enroll. Certain events (birth, adoption) can trigger retroactive coverage back to the event date.