You have 2 options based on your situation.
First, if you experience a life change, like getting married, having a baby or losing health coverage, that qualifies you for a special enrollment period, you may be able to enroll in a marketplace plan outside open enrollment. You may be asked to submit documents to prove your eligibility for a special enrollment period.
Second, through Medicaid or the Children’s Health Insurance Program (CHIP), you can apply for free or low-cost coverage ALL YEAR. If you qualify, you can enroll now. Exception include Native American tribes and Alaska Natives. Members of federally recognized tribes and Alaska Native shareholders can enroll in marketplace coverage any time of year. They can change plans as often as once a month.