The main purpose of this legislation, known as the "SOS: Sustaining Outpatient Services Act," is to update the Medicare program to allow for payments for certain medical items and services provided by off-campus outpatient departments of healthcare providers. This change aims to ensure that these services are reimbursed in a way that aligns with how hospital outpatient services are typically paid for, which can help maintain access to care for patients. Key provisions of the legislation include a specific amendment to the Social Security Act.