According to a report released by the Johns Hopkins Armstrong Institute Center for Diagnostic Excellence, an estimated 371,000 patients die, and 424,000 are permanently disabled each year because they are incorrectly diagnosed across a range of care settings.
Overall, the paper suggests medical providers misdiagnose diseases roughly 11% of the time. However, it's important to highlight that different conditions are missed at different rates. For example, only 1.5% of heart attacks are misdiagnosed, but spinal abscesses are wrongly identified 62% of the time.