| M.D. | Doctorate Of Medicine | - | Medical(slang) |
| MAP | Mean Arterial Pressure | - | Medical(slang) |
| MAR | Medication Administration Record | - | Medical(slang) |
| MCL | Modified Chest Lead | - | Medical(slang) |
| MDI | Multiple Daily Vitamin | - | Medical(slang) |
| MI | Myocardial Infarction | - | Medical(slang) |
| MLC | Midline Catheter | - | Medical(slang) |
| MM | Mucous Membrane | - | Medical(slang) |
| MOABS | Monoclonal Antibodies | - | Medical(slang) |
| MOM | Milk Of Magnesia | - | Medical(slang) |
| MRDD | Mental Retarded/Developmentally Disabled | - | Medical(slang) |
| MRDD | Mental Retarded/developmentally Disabled | - | Medical(slang) |
| MRI | Magnetic Resonance Imaging | - | Medical(slang) |
| MRM | Modified Radical Mastectomy | - | Medical(slang) |
| MS | Multiple Sclerosis | - | Medical(slang) |
| MVA | Motor Vehicle Accident | - | Medical(slang) |
