| Magnolia Regional Health Center | Not recorded | 25 people |
| Main Line Health System | Not recorded | 70 people |
| Manatee Memorial Hospital | Not recorded | 32 people |
| Martin Luther King, Jr. Community Hospital | Not recorded | 15 people |
| Mass General Brigham | Not recorded | 60 people |
| Mass General Brigham | Not recorded | 220 people |
| McLaren Health Care Corporation | Not recorded | 30 people |
| McLaren Health Care Corporation | Not recorded | 25 people |
| McLaren Health Care Corporation | Not recorded | 18 people |
| MedStar Georgetown Hospital | Not recorded | 147 people |
| Meharry Medical College School of Medicine | Not recorded | 48 people |
| Memorial Healthcare System, Hollywood, Florida | Not recorded | 52 people |
| Mercy Hospital (St Louis) | Not recorded | 28 people |
| Mercy St Vincent Medical Center | Not recorded | 36 people |
| Mercyhealth GME Consortium | Not recorded | 41 people |
| MGH | Not recorded | 28 people |
| MGH | Not recorded | 136 people |
| Midwestern University GME Consortium | Not recorded | 17 people |
| Mount Carmel Health System | Not recorded | 29 people |
| Mount Sinai Hospital Medical Center of Chicago | Not recorded | 49 people |
| NYMC | Not recorded | 70 people |
| NYMC | Not recorded | 172 people |
| NYP | Not recorded | 141 people |
| NYP / Weill Cornell | Not recorded | 15 people |