S.C. Code Ann. § 20-7-1240
To the extent necessary to reimburse the state agency administering the Medicaid program for expenditures on behalf of a child, the agency may petition the court seeking withholding of employment income or state tax refunds from a person who:
(3) has not used the payment to reimburse, as appropriate, either the other parent or guardian of the child or the provider of the items or services.
Claims for current or past due child support take priority over claims filed pursuant to this section.