| Provider | Group Practice/Location | Office Phone |
| Leenheers, Kaitlyn PA | Downtown Clinic - Maternal Fetal Medicine | (406) 237-8480 |
| Leenheers, Kaitlyn PA | Butte Clinic - Maternal Fetal Medicine | (406) 237-8480 |
| Lehman, Melanie PA-C | Billings Dermatology PC - Billings | (406) 294-9515 |
| Lehman, Dustin LCPC | ||
| Leinart-Murch, Peggy LCPC | Yellowstone Boys & Girls Ranch | (406) 656-3112 |
| Leintz, Jessica DPT | Laurel Clinic - Physical Therapy | (406) 628-2831 |
| Leithead, Lorin NP | Intermountain Health Connect Care - Urgent Care & Physical Therapy MT | 801-442-5502 |
| Lemelin, Charise MSW, LCSW | Yellowstone Boys & Girls Ranch | (406) 656-3112 |
| Lemelin, Charise MSW, LCSW | Yellowstone Boys & Girls Ranch - Clinic | (406) 655-2100 |
| Leone, Richard MD PHD | ||
| Leslie (was Norcross), Dawn LAC | Riverstone Health Clinic | (406) 697-0976 |
| Letzing, Michael MD | Diversified Radiology | (303) 914-8800 |
| Levy, Mark MD | St. Vincent Regional Hospital Neurosciences | (406) 237-5577 |
| Lewis, John LAC | Mental Health Center - Billings | (406) 252-5658 |
| Lewis, Marc LCSW | Intermountain Health Connect Care - Behavioral Health | 833-442-2670 |
| Lewis, Daniel MD | Holy Rosary Healthcare | (406) 233-2600 |
| Lewis, Daniel MD | SVHC Emergency & Trauma Center | (406) 237-4116 |
| Lewis-Smith, Kailey OTD | Ortho Montana PSC | (406) 237-5050 |
| Lewison, Kathleen MD | Butte Clinic - OB-GYN | (406) 496-3627 |
| Licht, Amber FNP-C | Planned Parenthood of Montana - Great Falls | (406) 454-3431 |
| Lien, Julie PT | Ortho Montana PSC | (406) 237-5050 |
| Lim, Annie DO | Diversified Radiology | (303) 914-8800 |
| Lim, Annie DO | SJMG Radiology | (406) 723-2500 |
| Lim, Annie DO | Butte Clinic- Radiology | (406) 723-2500 |
| Lin, Andrew MD | Intermountain Health Heart & Vascular - Downtown Clinic Cardiology | (406)237-5001 |