| Provider | Group Practice/Location | Office Phone |
| Groff, Kelsie APRN | N. 27th Walk-in Clinic | (406) 237-5110 |
| Groover, Michael DO | Ortho Montana PSC | (406) 237-5050 |
| Groover, Michael DO | Intermountain Health Holy Rosary Hospital | (406) 233-2600 |
| Groover, Michael DO | Intermountain Health Holy Rosary Hospital - Orthopedics | 406-223-4000 |
| Groover, Michael DO | Ortho Montana PSC - Lewistown | 406-237-5050 |
| Groover, Michael DO | Ortho Montana PSC - Miles City | 406-237-5050 |
| Grosulak, Lynn LCPC | Lynn M. Grosulak PLLC | (406) 855-9446 |
| Grove, Cameron MD | Roundup Memorial Healthcare | (406) 323-2301 |
| Grove, Cameron MD | Roundup Memorial Healthcare Clinic | (406) 323-3337 |
| Grove, Cameron MD | Vista Plains Health | (406) 632-4351 |
| Grove, Cameron MD | Vista Plains Health Clinic | (406) 632-4343 |
| Grover, Hayley CNM | ||
| Grubbs, Mckenzie LCPC | Youtherapy, PLLC | 406-201-9720 |
| Grundhauser (Castro), Carla LCSW | Big Sky Behavioral Health Inc | (406) 672-8411 |
| Grundhauser (Castro), Carla LCSW | Yellowstone Boys & Girls Ranch | (406) 656-3112 |
| Grunhuvd, Fredericka MSW, LCSW | Fredericka Grunhuvd LCSW PLLC | (406) 241-2511 |
| Grzybowski, Richard DO | Diversified Radiology | (303) 914-8800 |
| Grzybowski, Richard DO | SJMG Radiology | (406) 723-2500 |
| Gubbels, Sarah LCSW | Glendive Counseling Center | (406) 377-6217 |
| Gustin, Aaron DO | St. Vincent Neurosurgery | (406) 237-5577 |
| Gustin, Aaron DO | St. Vincent Regional Hospital Neurology Service | (406) 237-3850 |
| Gutierrez, Jennifer MD | NEMHS - Poplar Community Hospital | (406) 768-6100 |
| Gutierrez, Jennifer MD | NEMHS - Trinity Hospital | (406) 653-6500 |
| Guy, Douglas MD | Intermountain Health Heart & Vascular - Downtown Cardiothoracic & Vascular Surgery | (406) 237-5001 |
| Guyer, James MD | Riverstone Health Clinic | (406) 697-0976 |