Reducing emergency department charting and ordering errors with a room number watermark on the electronic medical record display.

This survey found that physicians chart or write orders in the wrong patient's electronic health record 1.3% of the time, with significant errors for nurses and clinical assistants as well. Respondents believed that a simple solution such as a prominent room number watermark on the screen would prevent such errors, reinforcing the need to be able to augment electronic health record interfaces to improve safety.