Section 457.2 - Basis and scope of subchapter D(a)Basis. This subchapter implements title XXI of the Act, which authorizes Federal grants to States for the provision of child health assistance to uninsured, low-income children.(b)Scope. The regulations in subchapter D set forth State plan requirements, standards, procedures, and conditions for obtaining Federal financial participation (FFP) to enable States to provide health benefits coverage to targeted low-income children, as defined at § 457.310 .