Jefferson Health and its network of hospitals and physician practices serve patients throughout the Delaware Valley. Jefferson Health is home to nationally ranked experts who are providing a personalized care plan for you. Sidney Kimmel Comprehensive Cancer Center – Jefferson Health is one of few NCI-designated Comprehensive Cancer Centers in the country. With more than 42,000 employees, comprised of nurses, physicians and practitioners, faculty, and more, we’re the second largest employer in Philadelphia and the largest health system in the Philadelphia region by total licensed beds. And our work to improve lives is never done.