- Mount Sinai South Nassau
- Mountain Hospice
- Mountain Valley Hospice & Palliative Care
- Mourning Dove Medical
- Movement Advancement Project
- Moving Health Home
- MSA Hospice
- Mt. Sinai
- Mt. Sinai Health System
- Much Shelist P.C.
- MultiCare Health System
- MultiCare Yakima Memorial Home Health & Hospice
- Multidisciplinary Digital Publishing Institute
- Multinational Association of Support Care in Cancer
- mumms Software
- Muse
- Muse Healthcare
- My House Visit
- MyndVR