1. Short title This Act may be cited as the Medicare Advantage Supplemental Benefits Transparency Act . 2. Increasing data transparency for supplemental benefits under Medicare Advantage (a) In general Section 1857(e) of the Social Security Act ( 42 U.S.C. 1395w–27(e) ) is amended by adding at the end the following new paragraph: (6) Reporting of enrollee-level data on supplemental benefits (A) In general Beginning with plan years beginning on or after January 1, 2027, a contract under this section with an MA organization shall require the organization to submit to the Secretary, for each MA plan offered by the organization, enrollee-level data on supplemental benefits (by item or service, or category of item or service, as determined appropriate by the Secretary, and national provider identifier, if available), including eligibility requirements for such benefits, the benefit category applicable with respect to each such benefit, and data on utilization of and payments for such benefits (including the total amount spent by the plan for each enrollee who utilized such benefits and the total out-of-pocket cost per utilization for each enrollee). (B) Data access (i) In general Not later than January 1 of the year that is two years after the beginning of a plan year for which data is submitted under subparagraph (A), the Secretary shall— (I) upon request, make such data available to individuals and entities for the purpose of conducting— (aa) evaluations and other analyses to support the program under this title; and (bb) other health care related research