This bill proposes to amend Title XVIII of the Social Security Act, which governs the Medicare program, by introducing new limitations on contracts with Medicare Advantage (MA) organizations . The primary goal is to regulate the number and distinctiveness of MA plans offered by a single organization. Specifically, the legislation prohibits the Secretary of Health and Human Services from entering into or renewing contracts with an MA organization for more than three MA plans for any given plan year. Furthermore, if an organization offers more than one MA plan, each plan must be significantly different in its premiums, benefits, or cost-sharing structure, as determined by the Secretary. These new restrictions would apply to contracts entered into or renewed one year after the bill's enactment.