45 C.F.R. § 302.80
Medical support enforcement
(a) The State plan may provide that the IV-D agency will secure and enforce medical support obligations under a cooperative agreement between the IV-D agency and the State Medicaid agency.
(b) The State plan must provide that the IV-D agency shall secure medical support information and establish and enforce medical support obligations in accordance with the requirements contained in §§ 303.30 and 303.31 of this chapter.