You can remain covered as a dependent on your parent’s policy until you turn 26. Once you lose eligibility as a dependent, you will qualify for a special enrollment opportunity. At that point, you will also be able to apply for health coverage and assistance through the Marketplace, even though it won’t be during a regular Open Enrollment period.  In addition, if your parent’s policy is a group plan offered by an employer with at least 20 workers, you would also be able to continue coverage under the policy through COBRA for up to 3 years.  However, the employer contribution to the premium would likely end and Marketplace subsidies cannot be applied to the COBRA coverage.