NCC MERP index for categorising medication errors23
| Harm | Category | Description |
|---|---|---|
| No error | A | Circumstances or events that have the capacity to cause error |
| Error, no harm | B | An error occurred but 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 to the patient and/or required intervention to preclude patient harm | |
| Error, harm | E | An error occurred that may have contributed to or resulted in temporary harm to the patient and required intervention |
| F | An error occurred that may have contributed to or resulted in temporary harm to the patient and required initial or prolonged hospitalisation | |
| G | An error occurred that may have contributed to permanent harm to the patient | |
| H | An error occurred that required intervention necessary to sustain patient life | |
| Error, death | I | An error occurred that may have contributed to or resulted in the patient's death |
NCC MERP, National Coordinating Council for Medication Error Reporting and Prevention.