1. Short title This Act may be cited as the Star Rating for Biosimilars Act . 2. Addition of new measures based on access to biosimilar biological products to the 5-star rating system under medicare advantage (a) In general Section 1853(o)(4) of the Social Security Act ( 42 U.S.C. 1395w–23(o)(4) ) is amended by adding at the end the following new subparagraph: (E) Addition of new measures based on access to biosimilar biological products (i) In general For 2021 and subsequent years, the Secretary shall add a new set of measures to the 5-star rating system based on access to biosimilar biological products covered under part B and, in the case of MA–PD plans, such products that are covered part D drugs. Such measures shall assess the impact a plan’s benefit structure may have on enrollees’ utilization of or ability to access biosimilar biological products, including in comparison to the reference biological product, and shall include measures, as applicable, with respect to the following: (I) Coverage Assessing whether a biosimilar biological product is on the plan formulary in lieu of or in addition to the reference biological product. (II) Preferencing Assessing tier placement or cost sharing for a biosimilar biological product relative to the reference biological product. (III) Utilization management tools Assessing whether and how utilization management tools are used with respect to a biosimilar biological product relative to the reference biological product. (IV) Utilization Assessing the percentage of enrollees prescribed the biosimilar biological product when the reference biological product is also available. (ii) Definitions In this subparagraph, the terms biosimilar biological product and reference biological product have the meaning given those terms in section 1847A(c)(6). (iii) Protecting patient interests In developing such measures, the Secretary shall ensure that each measure developed to address coverage, pref­er­enc­ing, or utilization management is constructed such that patients retain equal