Health Insurance

Open Enrollment Period

Open enrollment is your primary annual opportunity to choose or update health coverage; missing it typically means waiting another year without a qualifying life event.

Last reviewed: May 2026 · Editorial methodology

Definition

The Open Enrollment Period (OEP) is the designated annual window during which anyone can enroll in a new health insurance plan, renew existing coverage, or switch to a different plan — without needing a qualifying life event. For ACA marketplace plans, the federal OEP runs November 1 through January 15, with coverage starting January 1 for enrollments completed by December 15 and February 1 for those completed by January 15. Some state-based marketplaces set longer windows; for example, California and New Jersey extend enrollment into late January. For employer-sponsored insurance, OEP is typically set by the employer and lasts two to four weeks, often in the fall. Medicare has its own distinct annual enrollment periods: the Annual Enrollment Period runs October 15 through December 7 for Part D and Medicare Advantage changes, and the Medicare Advantage Open Enrollment Period runs January 1 through March 31. Missing your applicable OEP means you generally cannot get or change coverage until the following year unless a qualifying life event creates a Special Enrollment Period.

Where this term matters

Health Insurance →Medicare →/life-events →

Tip

Glossary definitions are educational. Always check your own policy language — insurers can define common terms differently from one another. When in doubt, request a written explanation from your agent.

Related terms

Special Enrollment Period (SEP)An SEP gives you typically 60 days after a qualifying life event to get health coverage without waiting for open enrollment.Qualifying Life Event (QLE)Qualifying life events — like losing coverage, getting married, or having a baby — trigger a limited window to enroll in or change health insurance plans.Health Insurance MarketplaceThe marketplace, also called the exchange, is where most people shop for ACA plans and access premium tax credits to reduce their monthly premium.ACA (Affordable Care Act)The ACA established consumer protections including guaranteed issue, coverage of preexisting conditions, and subsidized marketplace insurance for millions of Americans.Annual Enrollment Period (AEP)The AEP is the primary annual opportunity for Medicare beneficiaries to change their Medicare Advantage or Part D drug plan, with changes taking effect January 1.

Related guides

Source: Cover Forge USA editorial team|Last verified: May 2026|Methodology
Definitions are educational and may be simplified. Always refer to your policy contract and consult a licensed agent for terms that affect coverage decisions.
CF

Cover Forge USA Editorial Team

Editorial Lead

This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.

Reviewed June 2026

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