This implementation is in response to directives in the standards established by Section 6401(a) of the Affordable Care Act (ACA) in which CMS requires all state Medicaid agencies to implement the provider enrollment, screening, and revalidation provisions of the Affordable Care Act. These regulations were published in the Federal Register, Vol. 76, February 2, 2011, and were effective March 25, 2011. Revalidation FAQs PDF