- Lee Health
- Legacy Health
- Lehigh Valley Health Network
- Lexington Medical Center
- LHC Group
- Licking Memorial Health Systems
- LifeBridge Health
- LifeBrite Hospital Group
- LifeCare
- LifePoint Health
- Logan Health
- Loma Linda University Health
- Los Angeles County Health Services Department
- Louisiana Department of Health & Hospitals - Office of Behavioral Health
- Lovelace Health System
- Loyola University Health System
- LSU Healthcare Services Division
- Luminis Health
- Lutheran Health Network
- Madonna Rehabilitation Hospital System
- Maimonides Health
- MaineGeneral Health
- MaineHealth
- Main Line Health
- Major Health Partners
- Malvern Institute Recovery Centers
- Manatee Healthcare System
- Maricopa Integrated Health System
- Marin Healthcare District
- Marshall Health Network