| Methodist Southlake Medical Center | Southlake, TX | Acute Care Hospitals | Not rated |
| Metropolitan Behavioral Health | Dearborn, MI | Psychiatric | Not rated |
| Metropolitan Hospital | San Juan, PR | Acute Care Hospitals | Not rated |
| Midwestern Region Med Center, Inc | Zion, IL | Acute Care Hospitals | 4 stars |
| Mile Bluff Medical Center | Mauston, WI | Acute Care Hospitals | 4 stars |
| Millwood Hospital | Arlington, TX | Psychiatric | Not rated |
| Mimbres Valley Medical Center | Deming, NM | Critical Access Hospitals | Not rated |
| Minden Medical Center | Minden, LA | Acute Care Hospitals | 2 stars |
| Minimally Invasive Surgery Hospital | Lenexa, KS | Acute Care Hospitals | Not rated |
| Miramont Behavioral Health | Middleton, WI | Psychiatric | Not rated |
| Miravista Behavioral Health Center | Holyoke, MA | Psychiatric | Not rated |
| Mission Behavioral Health Hospital | Huntingburg, IN | Psychiatric | Not rated |
| Moberly Regional Medical Center | Moberly, MO | Acute Care Hospitals | 2 stars |
| Monroe Hospital | Bloomington, IN | Acute Care Hospitals | 4 stars |
| Monroe Surgical Hospital | Monroe, LA | Acute Care Hospitals | Not rated |
| Monterey Park Hospital | Monterey Park, CA | Acute Care Hospitals | 2 stars |
| Montrose Behavioral Health Hospital | Chicago, IL | Psychiatric | Not rated |
| Mount Carmel Behavioral Health | Columbus, OH | Psychiatric | Not rated |
| Mount Carmel New Albany Surgical Hospital | New Albany, OH | Acute Care Hospitals | Not rated |
| Mountain Lakes Medical Center | Clayton, GA | Critical Access Hospitals | Not rated |
| Mountain View Hospital | Gadsden, AL | Psychiatric | Not rated |
| Mountain View Hospital | Payson, UT | Acute Care Hospitals | 5 stars |
| Mountain View Regional Medical Center | Las Cruces, NM | Acute Care Hospitals | 2 stars |
| Mountain West Medical Center | Tooele, UT | Acute Care Hospitals | 4 stars |
| Mountainview Behavioral Hospital | Berkeley Heights, NJ | Psychiatric | Not rated |
| Mountainview Hospital | Las Vegas, NV | Acute Care Hospitals | 4 stars |
| Muleshoe Area Medical Center | Muleshoe, TX | Critical Access Hospitals | Not rated |
| MUSC Health Chester Medical Center | Chester, SC | Acute Care Hospitals | Not rated |
| MUSC Health Lancaster Medical Center | Lancaster, SC | Acute Care Hospitals | 4 stars |
| Mymichigan Medical Center Alpena | Alpena, MI | Acute Care Hospitals | 3 stars |
| Nacogdoches Memorial Hospital | Nacogdoches, TX | Acute Care Hospitals | 2 stars |
| Nashoba Valley Medical Center | Ayer, MA | Acute Care Hospitals | Not rated |
| National Park Medical Center | Hot Springs, AR | Acute Care Hospitals | 2 stars |
| Navicent Health Baldwin | Milledgeville, GA | Acute Care Hospitals | 2 stars |
| Nebraska Spine Hospital, LLC | Omaha, NE | Acute Care Hospitals | Not rated |
| Neuro Behavioral Hospital | Crown Point, IN | Psychiatric | Not rated |
| Neuropsychiatric Hospital of Indianapolis, LLC | Indianapolis, IN | Psychiatric | Not rated |
| Nexus Childrens Hospital Dallas | Dallas, TX | Childrens | Not rated |
| Ngmc Barrow, LLC | Winder, GA | Acute Care Hospitals | 4 stars |
| North Alabama Medical Center | Florence, AL | Acute Care Hospitals | 2 stars |
| North Alabama Shoals Hospital | Muscle Shoals, AL | Acute Care Hospitals | Not rated |
| North Austin Medical Center | Austin, TX | Acute Care Hospitals | 3 stars |
| North Carolina Specialty Hospital | Durham, NC | Acute Care Hospitals | Not rated |
| North Mississippi Health Services - South Marion | Winfield, AL | Acute Care Hospitals | 4 stars |
| North Mississippi Medical Center-Gilmore Amory | Amory, MS | Acute Care Hospitals | 3 stars |
| North Port Behavioral Health | North Port, FL | Psychiatric | Not rated |
| North Shore Medical Center | Miami, FL | Acute Care Hospitals | 1 star |
| North Star Hospital | Anchorage, AK | Psychiatric | Not rated |
| North Tampa Behavioral Health | Wesley Chapel, FL | Psychiatric | Not rated |
| Northbrook Behavioral Health Hospital | Blackwood, NJ | Psychiatric | Not rated |