| Abbreviation | Term(s) |
| Nausea and vomiting | N&V |
| Navel (umbilicus) | UMB |
| Neck vein distention | NVD |
| Negative | NEG or - |
| Neurology | NEURO |
| Nitrogen mustard | HN2 |
| No evidence of disease | NED |
| No evidence of recurrent disease | NERD |
| No significant findings | NSF |
| Normal | NL |
| Normal bowel sounds | NBS |
| Normal breath sounds | NBS |
| Normal temperature and pressure | NTP |
| Not applicable | NA |
| Not elsewhere classified | NEC |
| Not otherwise specified | NOS |
| Not reportable | NR |
| Not recorded | NR |
| Number of pregnancies resulting in viable infants | PARA |