| Abbreviation | Definition |
|---|---|
| OTSI | Optimum TransSource, Incorporated |
| OU | Osmania University Hyderabad |
| OUH | Odense University Hospital |
| OUH | Okayama University Hospital |
| OUH | Oslo University Hospital |
| OUH | Oxford University Hospitals |
| OVD | OVerDose |
| OVHD | Oak Valley Hospital District |
| OWC | Ohio Wellness Center |
| OWO | Oral WithOut |
| P&N | psychiatry and neurology |
| P.M.H.N.P. | Psychiatric/Mental-Health Nurse Practitioner |
| p/o | postoperative |
| PA | Personal Accident |
| PA | Personal Assistant |
| PA | Power of Attorney |
| PA | Provider Assigned |
| PAC | Physician's Assistant Committee |
| PAC | Post Anaesthesia Care |
| PAC | Post-Acute Care |