The Department of Medical Assistance Services has an appeals system for individuals who disagree with decisions about their services under the various Medicaid programs, including managed care health programs, and Medicaid Waiver services. Medicaid appeals can be complex, so before filing an appeal, you may want to consult experts like staff from the Virginia Poverty Law Center which also has this great Guide to Medicaid Appeals; the disAbility Law Center of Virginia, or the Office of the State Long Term Care Ombudsman.
Here is a link to the Department of Medical Assistance appeals portal which also includes an overview of the process.