Across the Sunshine State, hospitals in record numbers —148 in all— are feeling the sting of millions of dollars in Medicare fines for having too many patients return within a month for additional treatments, federal records released this month show. The average fine levied against Florida hospitals for readmitting patients nearly doubled since last year, from about a quarter of 1 percent of Medicare payments to more than a half of 1 percent, according to data analyzed by Kaiser Health News.