| Kaiser Sunnyside Medical Center | Clackamas, OR | Acute Care Hospitals | 4 stars |
| Keck Hospital of USC | Los Angeles, CA | Acute Care Hospitals | 5 stars |
| Kensington Hospital | Philadelphia, PA | Acute Care Hospitals | Not rated |
| Kettering Health Dayton | Dayton, OH | Acute Care Hospitals | 4 stars |
| King's Daughters Medical Center-Brookhaven | Brookhaven, MS | Acute Care Hospitals | 3 stars |
| Knox Community Hospital | Mount Vernon, OH | Acute Care Hospitals | 3 stars |
| Knoxville Center for Behavioral Medicine | Knoxville, TN | Psychiatric | Not rated |
| Lac/Olive View-UCLA Medical Center | Sylmar, CA | Acute Care Hospitals | 2 stars |
| Lafayette Hospital and Clinics | Darlington, WI | Critical Access Hospitals | Not rated |
| Lake Regional Health System | Osage Beach, MO | Acute Care Hospitals | 3 stars |
| Lakeview Hospital | Bountiful, UT | Acute Care Hospitals | 5 stars |
| Lakeview Memorial Hospital | Stillwater, MN | Acute Care Hospitals | 4 stars |
| Lancaster Behavioral Health Hospital | Lancaster, PA | Psychiatric | Not rated |
| Leconte Medical Center | Sevierville, TN | Acute Care Hospitals | 5 stars |
| Lehigh Valley Hospital - Hazleton | Hazleton, PA | Acute Care Hospitals | 2 stars |
| Leonard J Chabert Medical Center | Houma, LA | Acute Care Hospitals | 3 stars |
| Lima Memorial Health System | Lima, OH | Acute Care Hospitals | 3 stars |
| Lincoln Health Hospital | Hugo, CO | Critical Access Hospitals | Not rated |
| Loretto Hospital | Chicago, IL | Acute Care Hospitals | Not rated |
| Lucas County Health Center | Chariton, IA | Critical Access Hospitals | Not rated |
| Madelia Health | Madelia, MN | Critical Access Hospitals | Not rated |
| Madison Medical Center | Fredericktown, MO | Critical Access Hospitals | Not rated |
| Magee Womens Hospital of UPMC Health System | Pittsburgh, PA | Acute Care Hospitals | 4 stars |
| Magnolia Regional Health Center | Corinth, MS | Acute Care Hospitals | 2 stars |
| Maine General Medical Center | Augusta, ME | Acute Care Hospitals | 4 stars |
| Malvern Behavioral Health | Philadelphia, PA | Psychiatric | Not rated |
| Marietta Memorial Hospital | Marietta, OH | Acute Care Hospitals | 3 stars |
| Mark Twain Medical Center | San Andreas, CA | Critical Access Hospitals | 3 stars |
| Mary Bridge Children's Hospital | Tacoma, WA | Childrens | Not rated |
| Mary Lanning Healthcare | Hastings, NE | Acute Care Hospitals | 2 stars |
| Maryland Heights Center for Behavioral Health | Maryland Heights, MO | Psychiatric | Not rated |
| Mat-Su Regional Medical Center | Palmer, AK | Acute Care Hospitals | 3 stars |
| Mayo Clinic Health System Oakridge | Osseo, WI | Critical Access Hospitals | Not rated |
| McCone County Health Center | Circle, MT | Critical Access Hospitals | Not rated |
| McLaren Northern Michigan | Petoskey, MI | Acute Care Hospitals | 3 stars |
| Medical City Green Oaks Hospital | Dallas, TX | Psychiatric | Not rated |
| Medstar Good Samaritan Hospital | Baltimore, MD | Acute Care Hospitals | 3 stars |
| Medstar Union Memorial Hospital | Baltimore, MD | Acute Care Hospitals | 5 stars |
| Medstar Washington Hospital Center | Washington, DC | Acute Care Hospitals | 3 stars |
| Memorial Care Miller Children's & Women's Hosp Lb | Long Beach, CA | Childrens | Not rated |
| Memorial Healthcare | Owosso, MI | Acute Care Hospitals | 3 stars |
| Memorial Hospital | Fremont, OH | Acute Care Hospitals | 4 stars |
| Memorialcare Long Beach Medical Center | Long Beach, CA | Acute Care Hospitals | 2 stars |
| Mena Regional Health System | Mena, AR | Critical Access Hospitals | Not rated |
| Mercy Hospital | Bakersfield, CA | Acute Care Hospitals | 3 stars |
| Mercy Medical Center of Mt Shasta | Mount Shasta, CA | Critical Access Hospitals | 4 stars |
| Methodist Dallas Medical Center | Dallas, TX | Acute Care Hospitals | 3 stars |
| Metrohealth System | Cleveland, OH | Acute Care Hospitals | 3 stars |
| Michiana Behavioral Health Center | Plymouth, IN | Psychiatric | Not rated |
| Mid Coast Medical Center-Trinity | Trinity, TX | Acute Care Hospitals | Not rated |