“It’s a return trip nobody wants to take: You are discharged from the hospital only to find yourself re-admitted a few days later.
More and more people are finding themselves in this revolving door — at a cost to both hospitals and patients. A 2009 study in the New England Journal of Medicine showed that one in five Medicare patients discharged from the hospital had to be re-admitted within 30 days; 34 percent were back within 90 days. Those return trips cost the health care system more than $17 billion a year.”
Article
Ranit Mishori, The Washington Post, 15 December 2011

