Silver Book Fact
Medicare beneficiaries with 4 or more chronic conditions are 99 times more likely to be admitted to the hospital for ambulatory sensitive conditions, than Medicare beneficiaries without chronic conditions.
Wolff J, Starfield B, Anderson G. Prevalence, Expenditures, and Complications of Multiple Chronic Conditions in the Elderly. Arch Intern Med. 2002; 162(20): 2269-76. http://archinte.ama-assn.org/cgi/content/abstract/162/20/2269