| Mercy Hospital Washington | Washington, MO | Acute Care Hospitals | 4 stars |
| Mercy Medical Center | Merced, CA | Acute Care Hospitals | 3 stars |
| Mercy Medical Center | Canton, OH | Acute Care Hospitals | 3 stars |
| Mercy Medical Center Redding | Redding, CA | Acute Care Hospitals | 2 stars |
| Mercy Medical Ctr | Springfield, MA | Acute Care Hospitals | 2 stars |
| Mercy Regional Medical Center | Lorain, OH | Acute Care Hospitals | 2 stars |
| Mercy San Juan Medical Center | Carmichael, CA | Acute Care Hospitals | 3 stars |
| Mercy Specialty Hospital Southeast Kansas | Galena, KS | Acute Care Hospitals | Not rated |
| Mercy St Francis Hospital | Mountain View, MO | Critical Access Hospitals | Not rated |
| Mercy Walworth Hospital & Medical Center | Lake Geneva, WI | Critical Access Hospitals | 3 stars |
| Mercyhealth Hospital & Physician Clinic-Crystal la | Crystal Lake, IL | Acute Care Hospitals | Not rated |
| Mercyone Centerville Medical Center | Centerville, IA | Critical Access Hospitals | Not rated |
| Mercyone Clinton Medical Center | Clinton, IA | Acute Care Hospitals | 4 stars |
| Mercyone Des Moines Medical Center | Des Moines, IA | Acute Care Hospitals | 1 star |
| Mercyone Dyersville Medical Center | Dyersville, IA | Critical Access Hospitals | Not rated |
| Mercyone Elkader Medical Center | Elkader, IA | Critical Access Hospitals | Not rated |
| Mercyone Genesis Dewitt Medical Center | Dewitt, IA | Critical Access Hospitals | Not rated |
| Mercyone Newton Medical Center | Newton, IA | Acute Care Hospitals | 4 stars |
| Mercyone North Iowa Medical Center | Mason City, IA | Acute Care Hospitals | 2 stars |
| Mercyone Oelwein Medical Center | Oelwein, IA | Critical Access Hospitals | Not rated |
| Mercyone Siouxland Medical Center | Sioux City, IA | Acute Care Hospitals | 2 stars |
| Merit Health Wesley | Hattiesburg, MS | Acute Care Hospitals | 2 stars |
| Meritus Medical Center | Hagerstown, MD | Acute Care Hospitals | 3 stars |
| Merrick Medical Center | Central City, NE | Critical Access Hospitals | Not rated |
| Merrimack Health Lawrence Hospital | Lawrence, MA | Acute Care Hospitals | 2 stars |
| Methodist Celina Medical Center | Celina, TX | Acute Care Hospitals | Not rated |
| Methodist Charlton Medical Center | Dallas, TX | Acute Care Hospitals | 3 stars |
| Methodist Fremont Health | Fremont, NE | Acute Care Hospitals | 2 stars |
| Methodist Healthcare - Olive Branch Hospital | Olive Branch, MS | Acute Care Hospitals | 4 stars |
| Methodist Hospital of Chicago | Chicago, IL | Acute Care Hospitals | Not rated |
| Methodist Hospital of Sacramento | Sacramento, CA | Acute Care Hospitals | 3 stars |
| Methodist Hospitals Inc | Gary, IN | Acute Care Hospitals | 1 star |
| Methodist Jennie Edmundson | Council Bluffs, IA | Acute Care Hospitals | 3 stars |
| Methodist Mansfield Medical Center | Mansfield, TX | Acute Care Hospitals | 4 stars |
| Methodist Medical Center of Oak Ridge | Oak Ridge, TN | Acute Care Hospitals | 4 stars |
| Methodist Midlothian Medical Center | Midlothian, TX | Acute Care Hospitals | 4 stars |
| Methodist Richardson Medical Center | Richardson, TX | Acute Care Hospitals | 4 stars |
| Metrowest Medical Center | Framingham, MA | Acute Care Hospitals | 1 star |
| Mh St Joseph Warren Hospital | Warren, OH | Acute Care Hospitals | 3 stars |
| Miami County Medical Center | Paola, KS | Acute Care Hospitals | Not rated |
| Miami Valley Hospital | Dayton, OH | Acute Care Hospitals | 3 stars |
| Middlesboro ARH Hospital | Middlesboro, KY | Acute Care Hospitals | 1 star |
| Middlesex Hospital | Middletown, CT | Acute Care Hospitals | 3 stars |
| Midstate Medical Center | Meriden, CT | Acute Care Hospitals | 4 stars |
| Midwest Medical Center | Galena, IL | Critical Access Hospitals | Not rated |
| Milbank Area Hospital/Avera Health | Milbank, SD | Critical Access Hospitals | Not rated |
| Millinocket Regional Hospital | Millinocket, ME | Critical Access Hospitals | Not rated |
| Milton S Hershey Medical Center | Hershey, PA | Acute Care Hospitals | 4 stars |
| Minnesota Valley Health Center Inc | Le Sueur, MN | Critical Access Hospitals | Not rated |
| Minnie Hamilton Health System | Grantsville, WV | Critical Access Hospitals | Not rated |