Reporting patient safety events allows incidents to be tracked over time and identifies significant changes. This study reviewed and categorized incident reports regarding in-hospital cardiac arrest (IHCA) at two hospitals in Sweden to reduce IHCA and improve survival rates. The largest category included documentation and patient decision making errors, followed by pre-arrest care. Quarterly and annual tracking of reports allowed for prompt interventions such as implementation of a standardized form in the electronic health record instead of free text for documenting patient decisions.