; and (4) such additional information and assurances as the Secretary shall require. (c) Rural areas Not less than 15 percent of the amount of a grant awarded to a State under this section shall be used for making payments to eligible youth addiction treatment facilities that are located in rural areas or that target the provision of addiction treatment services to Medicaid or CHIP beneficiaries who have not attained the age of 21 and reside in rural areas. (d) Definitions For purposes of this section: (1) Addiction treatment services The term addiction treatment services means services provided to an individual for the purpose of treating a substance use disorder. (2) CHIP The term CHIP means the State children's health insurance program established under title XXI of the Social Security Act ( 42 U.S.C. 1397aa et seq.). (3) Eligible youth addiction treatment facility The term eligible youth addiction treatment facility means a facility that is a participating provider under the State Medicaid or CHIP programs for purposes of providing medical assistance or child health assistance to Medicaid or CHIP beneficiaries for youth addiction treatment services on an inpatient or outpatient basis (or both). (4) Medicaid The term Medicaid means the medical assistance program established under title XIX of the Social Security Act ( 42 U.S.C. 1396 et seq.). (5) Medicaid or CHIP beneficiary The term Medicaid or CHIP beneficiary means an individual who is enrolled in the State Medicaid plan, the State child health plan under CHIP, or under a waiver of either such plan. (6) Medically underserved populations The term medically underserved populations has the meaning given that term in section 330(b)(3) of the Public Health Service Act ( 42 U.S.C. 254b(b)(3) ). (7) Secretary The term Secretary means the Secretary of Health and Human Services. (e) Authorization of appropriations There are authorized to be appropriated $50,000,000 to carry out the provisions of this section. Funds appropriated under this subsection shall remain