According to a recent analysis,

... hospital-acquired conditions (HACs) decreased 17% from 2010 to 2013, resulting in:

• 1.3 million fewer incidents of patient harm
• about 50,000 fewer patient deaths in hospitals
• $12 billion in health care cost savings

Source: "AHRQ Analysis: Hospital-Acquired Conditions Reduced by 17 Percent From 2010 to 2013," Agency for Healthcare Research and Quality (AHRQ), November, 2015, http://www.ahrq.gov/news/hac.html