This bill proposes an amendment to the Social Security Act, specifically targeting Medicare Advantage (MA) plans to manage costs. It mandates that if the Secretary determines the average monthly payment to an MA plan for covering enrollees exceeds the average monthly cost of providing coverage under the original Medicare fee-for-service program (Parts A and B) for a given plan year, certain restrictions will apply. Beginning with plan years one year after enactment, such a determination would prohibit any individual from enrolling or re-enrolling in that specific Medicare Advantage plan for the immediately following plan year. However, this restriction does not apply to specialized MA plans for special needs individuals , ensuring continued access for vulnerable populations.