| Abbreviations | Meaning |
 | MCM6 | Manual Of Clinical Microbiology, 6th Edition |
| MCMI-III | Millon Clinical Multiaxial Inventory-III |
| MCMLA | Midcontinental Chapter Of The Medical Library Association |
| MCN | MCN: The American Journal Of Maternal/Child Nursing |
| MCN | Molecular And Cellular Neuroscience |
| MCNP | Massachusetts Coalition Of Nurse Practitioners |
| MCO | Managed Care Organization |
| MCO | Médecine Chirurgie Obstétrique |
| MCP | Molecular & Cellular Proteomics[periodical] |
| MCR | Molecular Cancer Research [periodical] |
| MCRR | Medical Care Research And Review [periodical] |
| MCRUD | Michigan Coalition To Reduce Underage Drinking |
| MCS | Michigan Chiropractic Society |
| MCS | Multiple Chemical Sensitivity |
| MCSFA | Michigan Citizens For SmokeFree Air |
| MCT | Molecular Cancer Therapeutics [periodical] |
| MCTRF | Manitoba Cancer Treatment And Research Foundation |
| MCU-PH | Maître De Conférences Des Universités-Praticien Hospitalier |
| MD | Medicinae Doctor. Doctor Of Medicine |
| MDA | Malaysian Dental Association |
| MDA | Manitoba Dental Association |
| MDA | Medical Directory Of Australia |
| MDA | Michigan Deaf Association |
| MDA | Michigan Dental Association |
| MDA | Missouri Dental Association |
| MDA | Montana Dental Association |
| MDA | Muscular Dystrophy Association Australia |
| MDA | Muscular Dystrophy Association USA |
| MDAA | Minnesota Dental Assistants Association |
| MDAC / ACDM | Muscular Dystrophy Association Of Canada / Association Canadienne De La Dystrophie Musculaire |
| MDAV | Medical Defence Association Of Victoria |
| MDCB | Medical Dosimetrists Certification Board |
| MDCH | Michigan Department Of Community Health |
| MDDS | Metro Denver Dental Society |
| MDDS | Metropolitan District Dental Society |
| MDF | Macular Degeneration Foundation |
| MDFF | Muscular Dystrophy Family Foundation |
| MDH | Minnesota Department Of Health |
| MDHA | Maine Dental Hygienists Association |
| MDHA | Manitoba Dental Hygienists Association |
| MDHA | Michigan Dental Hygienists Association |
| MDHA | Minnesota Dental Hygienists Association |
| MDHA | Missouri Dental Hygienists Association |
| MDHA | Montana Dental Hygienists Association |
| MDM | Medical Decision Making [periodical] |
| MDM | Médecins Du Monde. Doctors Of The World. |
| MDO | Maladies à Déclaration Obligatoires. Notifiable Diseases. |
| MDPA | Malaysian Private Dental Practitioners Association |
| MDPH | Massachusetts Department Of Public Health |
| MDPI | Molecular Diversity Preservation International |
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