| MARY HITCHCOCK MEMORIAL HOSP | LEBANON | NH | 506 |
| MARY IMMACULATE HOSPITAL LLC DBA MAR | NEWPORT NEWS | VA | 116 |
| MARY IMOGENE BASSETT HOSPITAL | COOPERSTOWN | NY | 180 |
| MARY LANNING MEMORIAL HOSPITAL ASSOC | HASTINGS | NE | 106 |
| MARY MC CLELLAN HOSPITAL | CAMBRIDGE | NY | 49 |
| MARY RUTAN HOSPITAL | BELLEFONTAINE | OH | 39 |
| MARY WASHINGTON HOSPITAL | FREDERICKSBURG | VA | 432 |
| MARYLAND GENERAL HOSPITAL | BALTIMORE | MD | 134 |
| MARYMOUNT HOSPITAL | GARFIELD HTS. | OH | 188 |
| MARYVIEW HOSPITAL LLC DBA BON SECOUR | PORTSMOUTH | VA | 177 |
| MASON DISTRICT HOSPITAL | HAVANA | IL | 36 |
| MASON GENERAL HOSPITAL | SHELTON | WA | 49 |
| MASONICARE HEALTH CENTER | WALLINGFORD | CT | |
| MASSAC MEMORIAL HOSPITAL | METROPOLIS | IL | 46 |
| MASSACHUSETTS EYE AND EAR INFIRMARY | BOSTON | MA | 41 |
| MASSACHUSETTS GENERAL HOSPITAL | BOSTON | MA | 997 |
| MASSAPEQUA GENERAL HOSPITAL | SEAFORD | NY | 78 |
| MASSENA MEMORIAL HOSPITAL | MASSENA | NY | 25 |
| MASSILLON COMMUNITY HOSPITAL | MASSILLON | OH | 70 |
| MAT-SU REGIONAL MED CTR | PALMER | AK | 125 |
| MATAGORDA REGIONAL MEDICAL CENTER | BAY CITY | TX | 45 |
| MATHER HOSPITAL | PORT JEFFERSON | NY | 195 |
| MAUI MEMORIAL MEDICAL CENTER | WAILUKU | HI | 219 |
| MAURY REGIONAL HOSPITAL | COLUMBIA | TN | 244 |
| MAYAGUEZ MEDICAL CENTER | MAYAGUEZ | PR | 216 |
| MAYERS MEMORIAL HOSPITAL | FALL RIVER MILLS | CA | 20 |
| MAYHILL HOSPITAL | DENTON | TX | 4 |
| MAYO CLINIC FLORIDA | JACKSONVILLE | FL | 324 |
| MAYO CLINIC HEALTH SYSTEM - RED WING | RED WING | MN | 23 |
| MAYO CLINIC HEALTH SYSTEM AUSTIN | AUSTIN | MN | 66 |
| MAYO CLINIC HEALTH SYSTEM-FAIRMONT | FAIRMONT | MN | 14 |
| MAYO CLINIC HOSPITAL | PHOENIX | AZ | 368 |
| MAYO CLINIC HOSPITAL ROCHESTER | ROCHESTER | MN | 1,159 |
| MAYO CLINIC METHODIST HOSPITAL | ROCHESTER | MN | 300 |
| MAYO CLNIC HLTH SYS-ALBRT LEA AUSTIN | AUSTIN | MN | 61 |
| MAYO REGIONAL HOSPITAL | DOVER-FOXCROFT | ME | 46 |
| MCALESTER REGIONAL HEALTH CENTER | MCALESTER | OK | 67 |
| MCALLEN MEDICAL CENTER | MCALLEN | TX | 505 |
| MCALLEN MEDICAL HEART HOSPITAL | MCALLEN | TX | 514 |
| MCBRIDE CLINIC ORTHOPEDIC HOSPITAL | OKLAHOMA CITY | OK | 68 |
| MCCALL MEMORIAL HOSPITAL | MCCALL | ID | 15 |
| MCCAMEY COUNTY HOSPITAL DISTRICT | MCCAMEY | TX | 16 |
| MCCRAY MEMORIAL HOSPITAL | KENDALLVILLE | IN | 55 |
| MCCREADY MEMORIAL HOSPITAL | CRISFIELD | MD | 3 |
| MCCUISTION REGIONAL MEDICAL CENTER | PARIS | TX | 134 |
| MCCULLOCH COUNTY HOSPITAL DISTRICT | BRADY | TX | 27 |
| MCCULLOUGH-HYDE MEMORIAL HOSPITAL | OXFORD | OH | 52 |
| MCCUNE-BROOKS HOSPITAL | CARTHAGE | MO | 35 |
| MCCURTAIN MEMORIAL HOSPITAL | IDABEL | OK | 77 |
| MCDONOUGH DISTRICT HOSPITAL | MACOMB | IL | 45 |
| MCDOWELL ARH | MCDOWELL | KY | 36 |
| MCGEHEE DESHA COUNTY HOSPITAL | MCGEHEE | AR | 34 |
| MCH - ELKINS PARK CAMPUS | ELKINS PARK | PA | 109 |
| MCHS - SOUTHWEST MINNESOTA REGION | MANKATO | MN | 166 |
| MCHS EAU CLAIRE HOSPITAL | EAU CLAIRE | WI | 217 |
| MCHS SOUTHWEST WI LA CROSSE | LA CROSSE | WI | 89 |
| MCKAY-DEE HOSPITAL | OGDEN | UT | 287 |
| MCKEE MEDICAL CENTER | LOVELAND | CO | 101 |
| MCKENNA MEMORIAL HOSPITAL | NEW BRAUNFELS | TX | 150 |
| MCKENZIE COUNTY HOSPITAL | WATFORD CITY | ND | 24 |
| MCKENZIE MEMORIAL HOSPITAL | SANDUSKY | MI | 37 |
| MCKENZIE REGIONAL HOSPITAL | MCKENZIE | TN | 30 |
| MCKENZIE-WILLAMETTE HOSPITAL | SPRINGFIELD | OR | 113 |
| MCLAREN CENTRAL MICHIGAN | MT PLEASANT | MI | 49 |
| MCLAREN FLINT | FLINT | MI | 292 |
| MCLAREN GREATER LANSING | LANSING MI 489100 | MI | 186 |
| MCLAREN LAPEER REGION | LAPEER | MI | 92 |
| MCLAREN MACOMB | MT. CLEMENS | MI | 270 |
| MCLAREN NORTHERN MICHIGAN | PETOSKEY | MI | 154 |
| MCLAREN OAKLAND | PONTIAC | MI | 107 |
| MCLAREN PORT HURON | PORT HURON | MI | 152 |
| MCLAREN THUMB REGION | BAD AXE | MI | 31 |
| MCLEOD HEALTH CHERAW | CHERAW | SC | 31 |
| MCLEOD HEALTH CLARENDON | MANNING | SC | 49 |
| MCLEOD LORIS SEACOAST HOSPITAL | LORIS | SC | 209 |
| MCLEOD MED CTR - DARLINGTON | DARLINGTON | SC | 36 |
| MCLEOD MEDICAL CENTER - DILLON | DILLON | SC | 36 |
| MCLEOD REGIONAL MEDICAL CENTER | FLORENCE | SC | 524 |
| MCNAIRY REGIONAL HOSPITAL | SELMER | TN | 28 |
| MCPHERSON HOSPITAL INC. | MCPHERSON | KS | 37 |
| MEADE DISTRICT HOSPITAL | MEADE | KS | 32 |
| MEADOWBROOK HOSPITAL | GARDNER | KS | 1 |
| MEADOWCREST HOSPITAL | GRETNA | LA | 207 |
| MEADOWS REGIONAL MEDICAL CENTER | VIDALIA | GA | 57 |
| MEADOWVIEW REGIONAL MEDICAL CENTER | MAYSVILLE | KY | 100 |
| MEADVILLE MEDICAL CENTER | MEADVILLE | PA | 200 |
| MEASE HOSPITAL AND CLINIC | DUNEDIN | FL | 112 |
| MEASE HOSPITAL COUNTRYSIDE | SAFETY HARBOR | FL | 362 |
| MEDCENTER HOSPITAL | MARION | OH | 142 |
| MEDCENTER ONE MANDAN | MANDAN | ND | 54 |
| MEDCENTRAL HEALTH SYSTEM | MANSFIELD | OH | 240 |
| MEDICAL ARTS HOSPITAL | LAMESA | TX | 21 |
| MEDICAL ARTS-TEXARKANA | TEXARKANA | TX | 102 |
| MEDICAL CENTER @ SYMMES | ARLINGTON | MA | 72 |
| MEDICAL CENTER AT ELIZABETH PLACE | DAYTON | OH | 26 |
| MEDICAL CENTER AT FRANKLIN | FRANKLIN | KY | 42 |
| MEDICAL CENTER BARBOUR | EUFAULA | AL | 30 |
| MEDICAL CENTER ENTERPRISE | ENTERPRISE | AL | 84 |
| MEDICAL CENTER HEALTH SYSTEM | ODESSA | TX | 300 |
| MEDICAL CENTER OF CALICO ROCK | CALICO ROCK | AR | 29 |
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