under title XIX of the Social Security Act ( 42 U.S.C. 1396 et seq.). (d) Grants to States To supplement Medicaid reimbursement to credentialed substance use disorder professionals The Secretary of Health and Human Services is authorized to make grants to States for the purpose of supplementing the reimbursement paid to credentialed substance use disorder professionals (as defined by the Secretary) under the Medicaid program under title XIX of the Social Security Act ( 42 U.S.C. 1396 et seq.). 15. Testing evidence-based mobile applications for the treatment of substance use disorders Section 1115A(b)(2) of the Social Security Act ( 42 U.S.C. 1315a(b)(2) ) is amended— (1) in subparagraph (A), by adding at the end the following new sentence: The models selected under this subparagraph shall include the model described in subparagraph (D), which shall be implemented by not later than January 1, 2020.