| Provider | Group Practice/Location | Office Phone |
| Lyders, Eric MD | SJMG Radiology | (406) 723-2500 |
| Lynn, Matthew MD | Diversified Radiology | (303) 914-8800 |
| Lynn, Matthew MD | SJMG Radiology | (406) 723-2500 |
| Lyson, Cheryl LCPC | Downtown Clinic - Behavioral Health Associates | (406) 237-3585 |
| Lyson, Cheryl LCPC | Downtown Clinic - Internal Medicine | (406) 238-6900 |
| L\'Heureux, Dena MD | SVHC Adult Critical Care | (406) 237-7200 |
| Ma, Chan MD | Downtown Clinic - Nephrology | (406) 237-5770 |
| Maagard, Dixon OD | Yellowstone Eye Care | (406) 656-7605 |
| Maagard, Dixon OD | Yellowstone Eye Care - Red Lodge | (406) 656-7605 |
| MacAdam, Brett MD | Eastern Radiological Associates | (406) 237-5490 |
| Macartney, Aran NP | SJMG Rocky Mountain Clinic | (406) 496-3633 |
| Macdonald, Andrea APRN | Integrative Mental Health Services PLLC | (406) 702-1466 |
| MacDonald, Ashley DNP, FNP | Ear, Nose & Throat Associates | (406) 238-6161 |
| Maher, Monica FNP | St. Vincent Regional Hospital - Emergency & Trauma Center | (406) 237-4116 |
| Mahler, Michael CRNA | Butte Clinic - Anesthesia | (406) 723-2472 |
| 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 |
| Malcom, Kenna DPT | Mountain Land Rehabilitation LLC - Westend | (406) 656-0950 |
| Malli, Sarah APRN | Roundup Memorial Healthcare | (406) 323-2301 |