The main purpose of this legislation, titled the "Preventing Hospital Overbilling of Medicare Act," is to address and correct issues related to improper billing practices by off-campus hospital locations. The legislation aims to ensure that Medicare payments are made fairly and consistently, preventing hospitals from charging more for services provided at these off-campus sites compared to those provided on-campus. Key provisions of the legislation include several important changes to how off-campus outpatient departments are defined and billed.