; (2) in subclause (IV), by striking the period at the end and inserting ; or ; and (3) by adding at the end the following new subclause: (V) under a qualified retiree prescription drug plan (as defined in section 1860D–22(a)(2)). . (b) Equalization of subsidies Notwithstanding any other provision of law, the Secretary of Health and Human Services shall provide for such increase in the special subsidy payment amounts under section 1860D–22(a)(3) of the Social Security Act ( 42 U.S.C. 1395w–132(a)(3) ) as may be appropriate to provide for payments in the aggregate equivalent to the payments that would have been made under section 1860D–15 of such Act ( 42 U.S.C. 1395w–115 ) if the individuals were not enrolled in a qualified retiree prescription drug plan. In making such computation, the Secretary shall not take into account the application of the amendments made by section 1202 of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 ( Public Law 108–173 ; 117 Stat. 2480). (c) Effective date This section, and the amendments made by this section, shall take effect on January 1, 2019. IV Medicaid collaborative care models 401. Enhanced FMAP for medical assistance provided through a collaborative care model Section 1905 of the Social Security Act ( 42 U.S.C. 1396d ) is amended— (1) in the first sentence of subsection (b)— (A) by striking , and (5) and inserting , (5) ; and (B) by inserting , and (6) beginning January 1, 2018, the Federal medical assistance percentage shall be 100 percent with respect to medical assistance provided by a State for items and services delivered through a collaborative care model (as defined in subsection (ee)) or an evidence-based model (which may be a collaborative care model) that integrates behavioral health services into primary care treatment before the period