
| Provider | Group Practice/Location | Office Phone |
| Oley, Erin FNP | Beartooth Billings Clinic - Clinic | (406) 446-2345 |
| Oley, William MD | Beartooth Billings Clinic | (406) 446-2345 |
| Oley, William MD | Beartooth Billings Clinic - Clinic | (406) 446-2345 |
| Oligbo, Molly PMHNP-BC | Beartooth Billings Clinic | (406) 446-2345 |
| Oligbo, Molly PMHNP-BC | Beartooth Billings Clinic - Clinic | (406) 446-2345 |
| Oliver, Cindy LCPC | Yellowstone Boys & Girls Ranch | (406) 656-3112 |
| Oliver, Kynzie PA | Billings Dermatology PC - Billings (fka:Tallman Dermatology) | (406) 294-9515 |
| Olivo, Elizabeth DNP | Planned Parenthood of MT - Great Falls | (406) 454-3431 |
| Olivo, Elizabeth DNP | Planned Parenthood of MT - Helena | (406) 443-7676 |
| Olivo, Elizabeth DNP | Planned Parenthood of MT - Missoula | (406) 728-5490 |
| Olivo, Elizabeth DNP | Planned Parenthood of MT - West | (406) 656-9980 |
| Olson, Catherine OD | Ophthalmic Associates of Billings LLC | (406) 256-6000 |
| Olson, Brittany LCPC, LAC | Yellowstone Boys & Girls Ranch | (406) 656-3112 |
| Olson-Meyer, Sharda LCSW | Sentinel Mental Health Inc | (406) 272-2511 |
| Olson-Meyer, Sharda LCSW | Sentinel Mental Health Inc - Helena | (406) 272-2511 |
| Olutola, Olatoye MD | Butte Clinic - General Surgery | (406) 723-2951 |
| Omar, Holly MD | Holy Rosary Healthcare | (406) 233-2600 |
| Omar, Holly MD | Holy Rosary Healthcare Clinic | (406) 233-2500 |
| Ommen, Regina CNM | North Miles Clinic- Midwifery and Women\'s Health Outreach | 406-238-6010 |
| Onstad, Matthew LCPC | Summit Therapy Center PC | (406) 272-2606 |
| Onstad, Daysi LCPC | Summit Therapy Center PC | (406) 272-2606 |
| Oommen, Bindhu MD | Holy Rosary Healthcare | (406) 233-2600 |
| Oommen, Bindhu MD | Holy Rosary Healthcare Clinic | (406) 233-2500 |
| Ortiz, Jose MD | Beartooth Billings Clinic | (406) 446-2345 |
| Ortiz, Jose MD | Beartooth Billings Clinic - Clinic | (406) 446-2345 |