; and (ii) by striking 2701(a)(3) and inserting 2704(a)(3) . (3) Effective date The amendments made by paragraphs (1) and (2)(A) shall apply to Medicare supplemental policies effective on or after January 1, 2023. (c) MedPAC studies and reports (1) Annual open enrollment (A) Study The Medicare Payment Advisory Commission (in this section referred to as the Commission ) shall conduct a study on providing an open enrollment period for Medicare supplemental policies (under section 1882 of the Social Security Act ( 42 U.S.C. 1395ss )) under which an individual could enroll in such a policy with guaranteed issue protections. Such study shall include an analysis of— (i) the impact of the birthday rule in California and Oregon, where an individual can enroll with such protections in a new policy with the same or lesser benefits within 30 days of their birthday; (ii) the impact of such birthday rule if such rule permitted the individual to enroll with such protections in any policy