
| Provider | Group Practice/Location | Office Phone |
| Oorlog, Ariana OT | SJMG Therapy - Whitehall | (406) 287-3717 |
| Opfer, Amanda DO | SJMG Emergency Physicians | (406) 723-2585 |
| Orizotti, Amber LCPC | Sentinel Mental Health Inc - Helena | (406) 272-2511 |
| Ortiz, Jose MD | Beartooth Billings Clinic | (406) 446-2345 |
| Ortiz, Jose MD | Beartooth Billings Clinic - Clinic | (406) 446-2345 |
| Osborne, Shay DPT | Mountain Land Rehabilitation LLC - Westend | (406) 656-0950 |
| Osborne, Shay DPT | Mountain Land Rehabilitation, LLC - Laurel | (406) 633-4620 |
| Oser, James MD | SJMG Emergency Physicians | (406) 723-2585 |
| Ossoff, Leslin LCPC | Yellowstone Boys & Girls Ranch | (406) 655-2100 |
| Ostahowski, Gary MD | Big Horn Hospital | (406) 665-2310 |
| Ostahowski, Gary MD | Broadwater Clinic - Occupational Health | (406) 237-8855 |
| Ostahowski, Gary MD | Downtown Clinic - Wound Healing Center | (406) 237-8270 |
| Ostahowski, Gary MD | St. Vincent Wound Care & Infectioud Disease PB | (406) 237-8270 |
| Ostahowski, Gary MD | SVHC Hardin Clinic | (406) 665-2800 |
| Ostby, Ailine LCPC | Sagehill Education Inc dba Ailine Ostby LCPC | (406) 696-1810 |
| Ostrander, Betsy MD | SVHC Neonatal Intensive Care | (406) 237-7076 |
| Ott, Rachel MD | Surgical Associates PC | (406) 238-6470 |
| Ottowicz, Jozef MD | St. Vincent Regional Hospital Neurosciences | (406) 237-5577 |
| Overvold, Kimberly LCSW | Omni Counseling Service, LLC | (406) 855-3501 |
| Owen, Thomas MD | Ortho Montana PSC | (406) 237-5050 |
| Owen, Thomas MD | Ortho Montana PSC - Westend | (406) 237-5050 |
| Owens, Rebecca LCPC | RWD Psychotherapy PLLC | (406) 294-5044 |
| Owens, Hannah NP | St Vincent Healthcare | (406) 238-7800 |
| Owens, Hannah NP | SVHC Pediatric Critical Care | (406) 237-7451 |
| Owens, Hannah NP | SVHC Pediatric Hospitalists | (406) 237-3850 |