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 period to apply for health coverage and financial assistance through the health insurance marketplace. This special enrollment opportunity will be in place 60 days before you lose eligibility for your parent’s plan and for 60 days after (although there may be an extension for exceptional circumstances). (45 C.F.R. § 147.120; 45 C.F.R. § 155.420).