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| Name | Specialty | Clinic/Hours | Local Tel./E-mail |
| Obaldo, Jerry | Nuclear Medicine | Nuclear Medicine Section/M-F 1-5pm | 2164/jerryo@hotmail.com | Obusan, Joseph Leonard | Ultrasonography | 2126 |
| Odrunia, Asuncion | Pulmonary Medicine | Suite 427/MWF 2-4pm | 3427 |
| Odrunia, Raymund | Pulmonary Medicine | Suite 427/TTh 2-4pm | 3427 |
| Olitoquit, Danilo | Adult Cardiology | ||
| Ong, Charmaine | Dermatology | 3423 | |
| Ong, Daniel | Neuro-Surgery | ||
| Ongjoco, Edgar | Adult Cardiology | ||
| Ong, Menchu | Pathology | 3321 | |
| Ordinario, Artemio | Neurology | 3800 | |
| Oreta, Jose | General Surgery | ||
| Ortiz, Edgardo | Pediatric Cardiology | Suite 601/MWF 4-6pm (by appt.) | 3601 |
