| Mc | Phenprocoumon (Marcumar®) |
| MCBF | mast cell burst factor |
| MCD | minimal cerebral dysfunction |
| mcg | micrograms |
| MCGN | mesangiocapilläre Glomerulonephritis |
| MCH | mean corpuscular haemoglobin |
| MCHC | mean corpuscular haemoglobin concentration |
| MCI | myocardial infarction |
| MCL | Medioclavicularlinie |
| MCLS | mucocutanes Lymphsyndrom |
| MCP | Metacarpophalangealgelenke |
| MCP | Metoclopramid |
| MCS | mechanical circulatory support |
| MCSF | Makrophagen Koloniestimulierender Faktor |
| MCT | medium chain triglycerides |
| MCTD | mixed connective tissue disease |
| MCU | Miktionszysturethrogramm |
| MCV | mittleres korpuskuläres Volumen |
| M.D. | medical degree |
| md | medical degree |
| MDC | Major Diagnostic Category (Hauptkategorien im DRG-System) |
| MDCK | Madin-Darby canine kidney (cells) |
| MdE | Minderung der Erwerbsfähigkeit |
| MDF | myocardial depressant factor |
| MDH | Milchsäuredehydrogenase (LDH) |
| MDK | Medizinischer Dienst der Krankenversicherung |
| MDP | Magen-Darm-Passage |
| MDRD-Formel | Modification of Diet in Renal Disease |
| MDS | myelodysplastisches Syndrom |
| MDT | Magen-Darm-Trakt |