“Title IV-D case” means an action in which services are provided by the Title IV-D agency under Part D, Title IV, of the federal Social Security Act (42 U.S.C. § 651 et seq.), relating to the location of an absent parent, determination of parentage, or establishment, modification, or enforcement of a child support, medical support, or dental support obligation, including a suit for modification filed by the Title IV-D agency under § 231.101(d) and any other action relating to the services that the Title IV-D agency is required or authorized to provide under § 231.101.