- Mosaic Life Care
- Mount Carmel Health System
- Mount Nittany Health System
- Mount Sinai Health System
- Mount Sinai Medical Center of Florida
- Multicare Health System
- Munson Healthcare
- MUSC Health
- Muscogee Creek Nation Health System
- MyMichigan Health
- Nacogdoches Memorial Health
- Nathan Littauer Hospital Association
- National Jewish Health
- Nationwide Childrens Hospital
- Natividad Medical Center
- Navajo Area Indian Health Service
- NCH Healthcare System
- Nebraska Department of Health & Human Services
- Nebraska Medicine
- Nebraska Methodist Health System
- Nemours Childrens Health System
- NeuroBehavioral Hospitals
- NeuroPsychiatric Hospitals
- New Hampshire Department of Health & Human Services
- New Jersey Division of Mental Health Services
- New Mexico Department of Health
- NewVista Behavioral Health
- New York City Health and Hospitals Corporation
- New York Presbyterian Healthcare System
- New York State Office of Mental Health