New York's public hospital system, the largest in the U.S., projects it will end the fiscal year with its lowest cash level in at least 15 years, and it's "imperative" that city officials come up with a plan to stabilize it, according to the state comptroller's office. The Health and Hospitals Corp., which serves 1.4 million patients annually, projects a closing cash balance of $104 million for the fiscal year ending June 30, enough to meet obligations for six days. The estimate was included in a report on New York City's finance issued by the state comptroller's office Monday.