A special enrollment period is a limited window — typically 60 days — during which you can enroll in or change a marketplace plan outside the annual open enrollment season, because something changed in your life.

Events that open one:

  • Losing other coverage: a job ended, hours dropped below the threshold, COBRA ran out, you turned 26 and left a parent’s plan
  • Moving to New York, or moving within the state to an area with different plans
  • Marriage, divorce, birth, adoption
  • A change in income that changes what programs you qualify for
  • Gaining lawful presence or citizenship
  • Release from incarceration

What is not a special enrollment period: deciding you’d like insurance now. Voluntarily dropping coverage generally doesn’t open one either.

The New York exception that people miss entirely. Medicaid, the Essential Plan and Child Health Plus have no enrollment season at all — they accept applications every month of the year. If your income falls in their range, you never need a special enrollment period, and being told you “missed the deadline” is a statement about marketplace plans, not about you.

What each program covers.

In New York: the window is normally 60 days, and the state’s own calendar is more generous than the federal one, with open enrollment running to January 31 rather than January 15. Two New York specific triggers are easy to miss. Losing Essential Plan eligibility counts, which is what happened to roughly 450,000 people when the income ceiling dropped to 200% of the poverty level on July 1, 2026. And a change in immigration status counts, which matters ahead of the federal tax credit change on January 1, 2027. Medicaid, the Essential Plan and Child Health Plus have no season at all.

Also called: SEP, qualifying life event. Reference: Special enrollment period on Wikipedia — general definition, not New York specifics.

More in Glossary of health coverage and billing terms

  • Dual eligible — Having Medicare and Medicaid at the same time, which covers premiums, cost sharing and the long-term care Medicare does not.
  • Parity (mental health parity) — The rule that a health plan may not make mental health and substance use care harder or costlier to get than comparable medical care.
  • Step therapy — The rule that you must try a cheaper drug first before the plan will cover the one you were prescribed.

This page explains how the system works. It is not medical advice. More.