- M D Anderson Cancer Ctr
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- Macon County General Hospital
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- Mark Reed Hospital
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- Martha Jefferson Health Svc
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- Martha's Vineyard Hosp Dev Ofc
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- Martin County Hospital Dist
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- Mary Black Hospital
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- Mary Bridge Children's Health
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- Mary Bridge Health Ctr
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- Mary Immaculate Hospital
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- Massachusetts Commonwealth
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- Maternity Support Svc
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- Maury Regional Hospital
- Max Foundation
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- Mc Leod Med Ctr-Dillon
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- Mc Nairy Regional Hospital
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- Mcleod Health Wilson Med Ctr
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- Med Match
- Medflight
- Medical & Heart Ctr
- Medical Arts Hospital
- Medical Center At Lancaster
- Medical Center Dallas Sw
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- Medical City Children's
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- Medical Daycare
- Medina Community Hospital
- Medselect
- Memorial 55 Plus
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- Memorial Assistance
- Memorial Atrium Imaging Ctr
- Memorial Community Hospital
- Memorial Healthcare System
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- Memorial Herman Hospital
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- Memorial Hermann Baptist
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- Memorial Hermann Baptist Hsp
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- Memorial Hermann Hospital
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- Memorial Hermann Hospital
- Memorial Hermann Hospital
- Memorial Hermann KATY Hospital
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- Memorial Hermann Memorial City
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- Memorial Hermann Southwest
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- Memorial Hermann Wellness Inst
- Memorial Hermann Wellness Inst
- Memorial Hermann Wellness Inst
- Memorial Hospital
- Memorial Hospital
- Memorial Hospital
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- Memorial Hospital
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- Memorial Hospital
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- Memorial Hospital Joint
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- MEMORIAL Hospital-Carbon Cnty
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- Memorial Hospital-Lafayette
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- Memorial Hospital-Pasadena
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- Memorial Medical Center-Livngs
- Memorial Medical Ctr
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- Memorial Mother Frances Hosp
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- Memorial Specialty Hospital
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- Memphis Hospital Svc
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- Memphis Veterans Affairs Med
- Mendota Mental Hlth Inst Libr
- Menomonee Falls Ambulatory
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- Mental Health Connections
- Mercy Hospital
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- Methodist Ambulatory Surgery
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- Methodist Hospital
- Methodist Hospital
- Methodist Hospital
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- Methodist Hospital South
- Methodist Le Bonheur Hospital
- Methodist Medical Ctr
- Methodist Medical Ctr-Oak Rdg
- Methodist Medical Group
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- Methodist North Hosp Child
- Methodist North Hospital
- Methodist Radiology Ctr
- Methodist Specialty & Trnsplnt
- Methodist Specialty & Trnsplnt
- Methodist Sugar Land Hospital
- Methodist Willowbrook Hospital
- Methodist Willowbrook Hospital
- Metroplex Hospital Physician
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- Metroplex MRI Dept
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- Metropolitan Methodist Hosp
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- Mid-Jefferson Hospital
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- Middle Tennessee Medical Ctr
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- Middlebury Volunteer Ambulance
- Midelford Hospital
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- Midland Memorial Hospital
- Midland Memorial Hospital
- Midland Memorial Hospital
- Midtown Surgery Ctr
- Midwest Clinical Laboratories
- Milan General Hosp Patient
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- Millbank Area Hospital/Avera
- Milwaukee Cty Mental Health
- Miner's Hospital Board
- Mission Hospital
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- Moab Immediate Care
- Mobridge Regional Hospital
- Moncks Corner Medical Ctr
- Moncrief Army Hospital
- Monkids Child Development Ctr
- Monongalia General Hospital
- Monongalia Hospital-Bio Med
- Monsignor Fitzpatrick-Home
- Monson Developmental Ctr
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- Montgomery County Hospital
- Montgomery County Hospital Dst
- Montgomery General Hospital
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- Morgantown Dialysis Ctr
- Morristown-Hamblen Hospital
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- Mt Ascutney Hospital & Health
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- Mt Sinai Hospital
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- Muenster Memorial Hospital
- Muleshoe Area Medical Ctr
- Multi Care Urgent Care Ctr
- Multicare Health System
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- Myrtle Werth Hospital-Mayo
- N Shore Univ At Forest Hills
- N Y City Health & Hosp
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- Nacogdoches Medical Ctr Hosp
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- Nashville General Hospital
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- National Jewish Medical
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- Navarro Regional Hospital
- Neuro Diagonistic Clinic
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- New London Family Medical Ctr
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- New Vision
- New York City Health/Hospitals
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- New York Eye & Ear Infirmary
- New York Foundling Hospital
- New York Foundling Hospital
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- New York Hospital
- New York Hospital Gastro
- New York Hospital Queens
- New York Hospital-Ob/Gyn
- Newberry County Memorial Hosp
- Newport Community Hospital
