Key Takeaway

In the US, Medicare Open Enrollment for 2026 coverage runs from October 15, 2025, through December 7, 2025. For individuals seeking individual or family coverage through the Affordable Care Act (ACA) Marketplace, Open Enrollment begins November 1, 2025, and generally runs through January 15, 2026, in most states. Knowing these key dates ensures you can adjust, select, or renew your health coverage without experiencing gaps.

Medicare Open Enrollment Dates in the US

The annual Medicare Open Enrollment Period (OEP) is the window when current Medicare beneficiaries can make changes to their health and prescription drug plans. For the 2026 plan year, this period starts on October 15, 2025, and ends on December 7, 2025.

According to Medicare.gov, these dates remain consistent each year to ensure beneficiaries have adequate time to review and select options (Medicare.gov, 2026). During this enrollment window, US residents can:

  • Switch from Original Medicare (Part A and Part B) to a Medicare Advantage plan (Part C).
  • Switch from one Medicare Advantage plan to another.
  • Join, drop, or switch a Medicare prescription drug plan (Part D).

Any coverage selections or plan changes made during this fall window will officially take effect on January 1, 2026.

ACA Marketplace Enrollment Windows

For individuals and families who do not qualify for Medicare and need to purchase their own health insurance, the Affordable Care Act (ACA) Marketplace is the primary resource. The annual Open Enrollment Period for 2026 Marketplace plans begins on November 1, 2025, and typically concludes on January 15, 2026, in the majority of US states.

According to official guidelines on HealthCare.gov, the exact day your coverage starts depends on when you complete your enrollment (HealthCare.gov, 2026):

  • Enroll by December 15, 2025, for coverage starting January 1, 2026.
  • Enroll between December 16, 2025, and January 15, 2026, for coverage starting February 1, 2026.

Read also: Texas Breaks ACA Health Insurance Open Enrollment Record in the US

Please note that some states operating their own health insurance exchanges may extend these deadlines beyond January 15.

Key Differences and Exceptions

It is important to distinguish these annual enrollment windows from other specific registration periods. For example, individuals turning 65 have a personal seven-month Initial Enrollment Period (IEP) for Medicare that is independent of the fall Open Enrollment dates.

Additionally, if you miss the standard windows for either Medicare or the ACA Marketplace, you cannot enroll or change plans unless you qualify for a Special Enrollment Period (SEP). Qualifying life events for an SEP include losing job-based insurance, moving to a new ZIP code, getting married, or having a baby.

The National Association of Insurance Commissioners (NAIC) advises consumers to verify state-specific requirements and confirm enrollment deadlines with licensed professionals to avoid potential penalties or coverage gaps (NAIC, 2026).

Your Next Steps

To prepare for the 2026 coverage year, start by reviewing your current medical costs, prescription drugs, and coverage limits. Compare the upcoming 2026 plan details on Medicare.gov or HealthCare.gov once they are released in October.

If you need personalized assistance, contact a licensed insurance agent or your local State Health Insurance Assistance Program (SHIP) to guide you through the selection process. Ensure your application is submitted before the official deadlines to avoid any disruptions to your healthcare services.

This article is for educational purposes and provides general information. It does not constitute personalized insurance, legal, or financial advice. Coverage rules, state minimum requirements, and policy availability vary across different US states. Always consult with a licensed insurance agent or your state Department of Insurance before making coverage decisions.