SeniorCare Emergency Medical Services | 2,622 followers on LinkedIn. With more than 1,000 employees and over 190 ambulances, SeniorCare Emergency Medical Services is one of the largest ambulance providers in New York City. Seniorcare EMS services over 100 health care facilities in New York City such as hospitals, skilled nursing facilities and assisted living facilities. SeniorCare also services Westchester county, Nassau, and parts of Suffolk county.