| Provider | Group Practice/Location | Office Phone |
| MacAdam, Brett MD | Eastern Radiological Associates | (406) 237-5490 |
| Macdonald, Andrea APRN | Integrative Mental Health Services PLLC | (406) 702-1466 |
| Mahoney, Chloe DPT | West Billings Physical Therapy | (406) 655-9060 |
| Maier, Dennis MD | Downtown Clinic - Wound Healing Center | (406) 237-8270 |
| Maier, Dennis MD | St. Vincent Wound Care & Infectioud Disease PB | (406) 237-8270 |
| Maier, Stacy LCSW | Yellowstone Boys & Girls Ranch | (406) 656-3112 |
| Maisch, Allison LCSW | RiverStone Health | (406) 247-3350 |
| Maisch, Allison LCSW | RiverStone Health - Medicine Crow School | (406) 247-3210 |
| Maisch, Allison LCSW | RiverStone Health - Orchard School | (406) 247-3210 |
| Maisch, Allison LCSW | RiverStone Health - Senior High School | (406) 247-3350 |
| Malik, Noman MD | Eastern Radiological Associates | (406) 237-5490 |
| Malli, Sarah APRN | Roundup Memorial Healthcare | (406) 323-2301 |
| Malli, Sarah APRN | Roundup Memorial Healthcare Clinic | (406) 323-3337 |
| Malody, Lisa MD | Downtown Clinic - Internal Medicine | (406) 238-6900 |
| Malters, Edward MD | Downtown Clinic - Internal Medicine | (406) 238-6900 |
| Malters, Edward MD | Intermountain Health West End Clinic - Internal Medicine | (406) 238-6900 |
| Malters, Deborah MD | Turnwell Mental Health of Montana - 24th Street | (406) 839-2985 |
| Malters, Deborah MD | Turnwell Mental Health of Montana - Bozeman | (406) 839-2985 |
| Malters, Deborah MD | Turnwell Mental Health of Montana - Grand | (406) 839-2985 |
| Mammenga, Jamie LCPC | Sound Perinatal and Fertility Counseling, PLLC | |
| Mangum, Jessica APRN | BVHC DBA One Health - Ashland | (406) 784-2346 |
| Mangum, Jessica APRN | BVHC DBA One Health - Chinook | (406) 357-2294 |
| Mangum, Jessica APRN | BVHC DBA One Health - Dawson | 406-377-9410 |
| Mangum, Jessica APRN | BVHC DBA One Health - Glendive | (406) 815-5831 |
| Mangum, Jessica APRN | BVHC DBA One Health - Hardin | (406) 665-4103 |