| Abbreviation | Definition |
|---|---|
| NMHA | New Mexico Hospital Association |
| NMSH | North Mississippi State Hospital |
| NMSL | Nigerian National Petroleum Corporation Medical Services Limited |
| NMSP | Newborn Mass Screening Program |
| NMTR | Nothing Machine Therapy Recordings |
| NMUC | National Medical Utilization Committee |
| NMUH | North Middlesex University Hospital |
| NNMC | National Naval Medical Center |
| NNNSV | No Needle No Scalpel Vasectomy |
| NNT | Numbers Needed to Treat |
| NNUH | Norfolk and Norwich University Hospital |
| NOH | Nebraska Orthopaedic Hospital |
| NOH | not on hospital |
| NOHC | Neurologic & Orthopedic Hospital of Chicago |
| NOK | Next Of Kin |
| NOLC | Natural Orifice Linear Cutter |
| NOMC | North Oakland Medical Center |
| NOMC | North Okaloosa Medical Center |
| NOMC | Northwestern Ontario Medical Center |
| NOMI | Naval Operational Medicine Institute |