Mass General Brigham (MGB) is a not-for-profit, integrated health care system that engages in medical research, teaching, and patient care. It is the largest hospital-based research enterprise in the United States, with annual funding of more than $2 billion. The system's annual revenue was nearly $18 billion in 2022. It is also an educational institution, founded by Brigham and Women's Hospital and Massachusetts General Hospital. The system provides clinical care through two academic hospitals, three specialty hospitals, seven community hospitals, home care services, a health insurance plan, and a robust network of specialty practices, urgent care facilities, and outpatient clinics/surgical centers. It is the largest private employer in Massachusetts. In 2023, the system reported that from 2017–2021 its overall economic impact was $53.4 billion – more than the annual state budget.