Image via Chester County Hospital. Chester County Hospital has once again been ranked among the best hospitals in the state by U.S. News & World Report. The hospital — which became part of Penn Medicine in 2013 and has outpatient services in Exton, West Goshen, New Garden, West Grove, Jennersville, and Kennett Square — is ranked No. 8 in the Philadelphia region and No. 14 in Pennsylvania. It was also rated as high performing in gastroenterology (GI) and GI surgery, neurology and neurosurgery, pulmonology and lung surgery, as well as heart failure, heart attack, stroke, back surgery, hip replacement, chronic obstructive pulmonary disease, and pneumonia.