Preventable diagnostic errors remain a significant cause of harm in U.S. hospitals, yet there is a substantial gap in the implementation of evidence-based practices to stop these errors. Two recent articles, "Hospital Commitments to Address Diagnostic Errors" (2024) and " Burden of Serious Harms From Diagnostic Errors in the USA" (2023), underscore the severity of diagnostic failures and highlight the most responsible culprit—hospital leadership.