| Abbreviation | Definition |
|---|---|
| NIS | Nationwide Inpatient Sample |
| NJH | National Jewish Hospital |
| NJHC | National Jewish Health Center |
| NJR | National Joint Registry (UK) |
| NJRR | National Joint Replacement Registry (Australia) |
| NKDA | No Known Drug Allergies |
| NKFA | No Known Food Allergies |
| NLAH | North Laurel Animal Hospital |
| NLC | Neurotrauma Law Center |
| NLH | Nathan Littauer Hospital |
| NLS | Not Life Safe |
| NMAH | Newport Mesa Animal Hospital |
| NMAH | North Mecklenburg Animal Hospital |
| NMC | New Medical Center |
| NMC | Nursing and Midwifery Council |
| NMCH | Nalanda Medical College and Hospital |
| NMCSD | Naval Medical Center San Diego |
| NMDH | Naonal Mobile Disaster Hospital |
| NMDH | Northwestern Medicine Delnor Hospital |
| NMH | Northwestern Memorial Hospital |