156Mucopolysaccharidoses (MPS) - Type 6 (黏多醣症第6型)
157Multiple Epiphyseal Dysplasia (MED) (多發性骨骺發育不全症)
158Multiple Pituitary Hormome Deficiency (MPHD) / Anterior Pituitary Hypoplasia (腦下垂體發育不全症)
159Multiple Sclerosis (MS) (多發性硬化症)
160Multiple System Atrophy (MSA) - Pakinsonian Subtype (多重系統退化症-非典型巴金森症)
161Multiple System Atrophy (MSA) - Type C (多重系統退化症-C型)
162Myasthenia Gravis (MG) (重症肌無力症)
163Myhre Syndrome (Myhre綜合症)