| MAAGB | Medical Artists Association of Great Britain |
|---|---|
| MASA | Medical Association of South Africa; mental retardation-aphasia-shuffling gait-adducted thumbs [synd... |
| MCA | major coronary artery; Maternity Center Association; medical care administration; methylcholanthrene... |
| MEA | male-enhanced antigen; Medical Exhibition Association; mercaptoethylamine; monoethanolamine; multipl... |
| MGMA | Medical Group Management Association |