; (bb) are in the top quartile of per beneficiary spending for such plan or waiver for the most recent year; and (cc) have attained age 21 but have not attained age 65. (II) Risk adjustment The CMI may adjust the demonstration budget determined for a Medicaid managed care entity and a year under this clause using a risk adjustment model selected by the CMI to account for differences in age and clinical conditions of the eligible Medicaid beneficiaries enrolled with the entity compared to the overall population upon which the demonstration budget is based. (C) Selection of eligible States Not later than 1 year after the date of enactment of this subsection, the CMI shall select not less than 2 eligible States to participate in the demonstration. (3) Additional waiver authority In addition to the authority described in subsection (d)(1), the Secretary may waive such requirements of title XIX as necessary to carry out the demonstration. (4) Definitions In this subsection: (A) Eligible Medicaid beneficiary The term eligible Medicaid beneficiary means an individual who— (i) is eligible for medical assistance under a State plan under title XIX or a waiver of such a plan; (ii) has a diagnosis of opioid use disorder; (iii) does not have a permanent residence (as certified by the individual); (iv) is currently receiving medication-assisted treatment or completed a course of medication-assisted treatment during the 3-month period preceding the individual's participation in the demonstration; and (v) has attained age 21 but has not attained age 65. (B) Eligible State (i) In general The term eligible State means a State that— (I) makes medical assistance available to all individuals described in section 1902(a)(10)(A)(i)(VIII)