About 15,000 Medicare patients in the US die due to adverse hospital events each month, according to an analysis by the Department of Health and Human Services.

Adverse events are considered to be any medical care that causes harm to a patient. They include surgical errors, the spread of infection in hospital and inadequate insulin management.

The study evaluated a national representative of 780 Medicare patients who were discharged from the hospital in October 2008.

Results indicate showed that 134,000 people experience some sort of adverse event each month.

Adverse events also contribute to 15,000 deaths per month, or 180,000 deaths per year.