Most Medicaid plans are considered minimum essential coverage, which means that enrollees in these plans meet the requirement for having health coverage under the health care law.
If your Medicaid plan qualifies as minimum essential coverage you are not eligible for a premium tax credit or other financial assistance to enroll into health coverage through Virginia's Insurance Marketplace. You should immediately end Virginia's Insurance Marketplace coverage for anyone in your household who is enrolled in the Medicaid plan and is also using premium tax credits through Virginia's Insurance Marketplace.
If your Medicaid plan DOESN'T qualify as minimum essential coverage you are eligible for premium tax credits and other financial assistance through Virginia's Insurance Marketplace, if you qualify based on your income and other criteria.