how many deaths are caused by medical misdignoses

In the U.S., a widely cited estimate is that diagnostic errors are linked to about 40,000 to 80,000 deaths each year in hospitals, while one major 2023 analysis estimated nearly 800,000 deaths or permanent disabilities annually when serious harms are included.

What the numbers mean

Those figures are not the same because they measure different things. The smaller range focuses on deaths in hospitals specifically, while the larger estimate includes both deaths and cases of permanent disability from diagnostic errors across health care settings.

Why estimates vary

Researchers warn that medical-error numbers are hard to measure precisely, because studies use different definitions, settings, and methods. That means headlines like “third leading cause of death” can be misleading if they mix together different kinds of harm or rely on uncertain data.

Practical takeaway

A fair plain-English answer is: medical misdiagnosis causes tens of thousands of deaths a year in U.S. hospitals, and far more people are harmed overall when permanent disability and broader diagnostic failures are included.

Estimate| What it covers
---|---
40,000 to 80,000 deaths yearly| U.S. hospital deaths related to misdiagnosis 11
Nearly 800,000 yearly harms| Deaths plus permanent disability from diagnostic errors 13

TL;DR: Misdiagnosis is a serious cause of death, but the exact number depends on how broadly you count the harm.