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Table 1 National Coordinating Council for Medication Errors Reporting and Prevention (NCCMERP) classification of severity of medical errors

From: Cross-checking to reduce adverse events resulting from medical errors in the emergency department: study protocol of the CHARMED cluster randomized study

A Circumstances or events that have the capacity to cause error
B An error occurred but the error did not reach the patient
C An error occurred that reached the patient but did not cause patient harm
D An error occurred that reached the patient and required monitoring to confirm that it resulted in no harm and/or required intervention to preclude harm
E An error occurred that may have contributed to or resulted in temporary harm
F An error occurred that may have contributed to or resulted in temporary harm and required initial or prolonged hospitalization
G An error occurred that may have contributed to or resulted in permanent patient harm
H An error occurred that required intervention necessary to sustain life
I An error occurred that may have contributed to or resulted in the patient’s death