For more than 40 years, Paramedic Services of Illinois remains the pioneer of contractual paramedic services. PSI specializes in Municipal and Fire Protection District contracts. By employing dedicated professionals and maintaining high standards, PSI has developed a distinguished reputation in the EMS/Fire industry. PSI currently provides paramedics/firefighters to 25 communities, an in-house Critical Care Transport Team to Good Samaritan Hospital and offers a state-of-the-art ambulance/fire rescue billing service to our clients and other communities. Our 300 employees respond to over 50,000 emergency responses on an annual basis.