United States Attorneys are authorized to make the certification provided for in 10 U.S.C. § 1089(c), 22 U.S.C. § 817(c), 28 U.S.C. § 2679(d), 38 U.S.C. § 4116(c), and 42 U.S.C. §§ 233(c) and 2458a(c), in order to substitute the United States as defendant in place of federal employees acting within the scope of their federal employment who have been sued under state tort law. See 28 C.F.R. § 15.3.
4-5.640 FTCA Staff -- Medical Care Recovery Act Cases

Sections 2651 to 2653 of Title 42 authorize the recovery of the reasonable value of hospital, medical, surgical, or dental care and treatment (including prostheses and medical appliances) which the United States is authorized or required by law to furnish or has furnished to a person who is injured or suffers a disease under circumstances creating tort liability upon the part of a third party.