1. Short title This Act may be cited as the Patient Shared Savings Act . 2. Allowing prescription drug plans and MA–PD plans to share with enrollees a portion of savings from switching to lower cost therapeutic alternative medications (a) In general Section 1860D–4 of the Social Security Act ( 42 U.S.C. 1395w–104 ) is amended— (1) by redesignating subsection (m) (relating to program integrity transparency measures), as added by section 6063(c) of the Substance Use-Disorder Prevention that Promotes Opioid Recovery and Treatment for Patients and Communities Act ( Public Law 115–271 ), as subsection (n); and (2) by adding at the end the following new subsection: (o) Sharing with enrollees a portion of savings from switching to a lower cost therapeutic alternative medication (1) In general For plan years beginning on or after January 1, 2021, a PDP sponsor of a prescription drug plan may have a program under which the PDP sponsor shares with an enrollee in the plan a portion of savings to the PDP sponsor as a result of the enrollee switching from a covered part D drug the enrollee is taking on an ongoing basis to a lower cost therapeutic alternative covered part D drug. (2) Requirements If a PDP sponsor implements a program described in paragraph (1), the following requirements shall apply with respect to the program: (A) Requirements with respect to enrollees The enrollee— (i) must have been taking the covered part D drug on an ongoing basis for at least 2 months as confirmed by claims analysis by the PDP sponsor prior to switching to the lower cost therapeutic alternative covered part D drug