; (3) impose any prior authorization requirements for coverage of such insulin that were not applied during the year in which the list price reduction certification was provided under such section 5(b)(2)(A); or (4) establish a step therapy requirement for such insulin that was not applied during the year in which the list price reduction certification was provided under such section 5(b)(2)(A). (d) Definitions In this section— (1) the term certified insulin means, with respect to a year, insulin that has been certified under section 5(b) of the Insulin Price Reduction Act for the year; (2) the term insulin means any insulin product approved by the Food and Drug Administration to improve glycemic control in patients with diabetes mellitus; (3) the term list price has the meaning given the term wholesale acquisition cost in section 1847A(c)(6)(B) of the Social Security Act