| Mahaska Health Partnership | Oskaloosa, IA | Critical Access Hospitals | 4 stars |
| Mahnomen Health Center | Mahnomen, MN | Rural Emergency Hospital | Not rated |
| Major Hospital | Shelbyville, IN | Acute Care Hospitals | 4 stars |
| Marion General Hospital | Columbia, MS | Acute Care Hospitals | 1 star |
| Mary Greeley Medical Center | Ames, IA | Acute Care Hospitals | 4 stars |
| Maury Regional Hospital | Columbia, TN | Acute Care Hospitals | 3 stars |
| Meeker Memorial Hospital | Litchfield, MN | Critical Access Hospitals | Not rated |
| Memorial Hospital | Logansport, IN | Acute Care Hospitals | 4 stars |
| Memorial Hospital | Marysville, OH | Acute Care Hospitals | 5 stars |
| Memorial Hospital at Gulfport | Gulfport, MS | Acute Care Hospitals | 3 stars |
| Memorial Hospital of Carbon County | Rawlins, WY | Critical Access Hospitals | Not rated |
| Memorial Hospital of Converse County | Douglas, WY | Critical Access Hospitals | 4 stars |
| Memorial Hospital, the | Craig, CO | Critical Access Hospitals | Not rated |
| Memorial Medical Center | Port Lavaca, TX | Critical Access Hospitals | 4 stars |
| Memphis Mental Health Institute | Memphis, TN | Psychiatric | Not rated |
| Mercy Hospital Lincoln | Troy, MO | Critical Access Hospitals | Not rated |
| Mercy Hospital Marietta | Marietta, OK | Critical Access Hospitals | Not rated |
| Metropolitan Hospital Center | New York, NY | Acute Care Hospitals | 3 stars |
| Minidoka Memorial Hospital | Rupert, ID | Critical Access Hospitals | Not rated |
| Mitchell County Hospital Health Systems | Beloit, KS | Critical Access Hospitals | 3 stars |
| Monroe County Hospital | Albia, IA | Critical Access Hospitals | Not rated |
| Montgomery County Memorial Hospital | Red Oak, IA | Critical Access Hospitals | Not rated |
| Morrill County Community Hospital | Bridgeport, NE | Critical Access Hospitals | Not rated |
| Morris County Hospital | Council Grove, KS | Critical Access Hospitals | 3 stars |
| Morristown Hamblen Hospital Association | Morristown, TN | Acute Care Hospitals | 2 stars |
| Morton County Hospital | Elkhart, KS | Critical Access Hospitals | Not rated |
| Ms State Hospital-Whitfield | Whitfield, MS | Psychiatric | Not rated |
| Murray County Memorial Hospital | Slayton, MN | Critical Access Hospitals | Not rated |
| Mymichigan Medical Center West Branch | West Branch, MI | Acute Care Hospitals | 5 stars |
| Natividad Medical Center | Salinas, CA | Acute Care Hospitals | 3 stars |
| Nell J Redfield Memorial Hospital | Malad City, ID | Critical Access Hospitals | Not rated |
| Nemaha County Hospital | Auburn, NE | Critical Access Hospitals | Not rated |
| Neosho Memorial Regional Medical Center | Chanute, KS | Critical Access Hospitals | 1 star |
| Neshoba County General Hospital | Philadelphia, MS | Acute Care Hospitals | 3 stars |
| Neshoba County General Hospital | Philadelphia, MS | Critical Access Hospitals | Not rated |
| Nevada Regional Medical Center | Nevada, MO | Acute Care Hospitals | Not rated |
| Newman Regional Health | Emporia, KS | Critical Access Hospitals | 2 stars |
| Nkc Health | North Kansas City, MO | Acute Care Hospitals | 4 stars |
| North Sunflower Medical Center CAH | Ruleville, MS | Critical Access Hospitals | 1 star |
| Northeast Alabama Regional Medical Center | Anniston, AL | Acute Care Hospitals | 1 star |
| Northeast Georgia Medical Center, Inc | Gainesville, GA | Acute Care Hospitals | 3 stars |
| Northfield Hospital | Northfield, MN | Acute Care Hospitals | 4 stars |
| Norton County Hospital | Norton, KS | Critical Access Hospitals | Not rated |
| Norwood Health Center | Marshfield, WI | Psychiatric | Not rated |
| Novant Health New Hanover Regional Medical Center | Wilmington, NC | Acute Care Hospitals | 3 stars |
| Ochsner Medical Center-Hancock | Bay Saint Louis, MS | Acute Care Hospitals | 3 stars |
| Ohiohealth Morrow County Hospital | Mount Gilead, OH | Critical Access Hospitals | Not rated |
| Okeene Municipal Hospital | Okeene, OK | Critical Access Hospitals | Not rated |
| Olympic Medical Center | Port Angeles, WA | Acute Care Hospitals | 3 stars |
| Ortonville Area Health Services | Ortonville, MN | Critical Access Hospitals | Not rated |