- Sparrow Health System
- Spartanburg Regional Healthcare System
- Spaulding Rehabilitation Network
- Spectrum Health
- Spine Hospital of Louisiana
- Springstone
- SSM Health
- SSM Health in Illinois
- SSM Health in Mid-Missouri
- SSM Health in Oklahoma
- SSM Health in Wisconsin
- Stamford Health
- Stanford Childrens Health
- Stanford Health Care
- Stars Behavioral Health Group
- Stat Emergency Center of Laredo
- Steward Health Care System
- Stillwater Medical Center Authority
- St Joseph Health System
- St Marys Healthcare Amsterdam
- St Marys Health Care System
- Stony Brook Medicine
- Stormont Vail Health
- St. Peters Health
- St Peters Healthcare System
- St Peters Health Partners
- Sturdy Memorial Hospital
- St Vincent Health
- Summa Health System
- Summit BHC