(1) "Delegate child support enforcement unit" means the unit of a county department of human or social services or its contractual agent that is responsible for carrying out the provisions of this article 13. The term contractual agent includes a private child support collection agency, operating as an independent contractor with a county department of human or social services, that contracts to provide any services that the delegate child support enforcement unit is required by law to provide.
(2) (a) "IV-D case" or "IV-D support order" means a case or a support order with respect to a child in which support enforcement services are provided, in accordance with Title IV-D of the federal "Social Security Act", as amended, and pursuant to this article, by the delegate child support enforcement unit to a custodian of a child who is or was a recipient:
(I) Of aid to families with dependent children, as that program was in effect as of July 16, 1996;
(II) Under the Colorado works program pursuant to part 7 of article 2 of this title;
(III) Of medical assistance only under articles 4, 5, and 6 of title 25.5, C.R.S.;
(IV) Of Title IV-E foster care; or
(V) Of foster care services under article 5 of this title.
(b) The terms "IV-D case" or "IV-D support order" also include any case or order in which the custodian of a child applies to the delegate child support enforcement unit for support enforcement services and pays a fee for such services under section 26-13-106 (2).