158Mucopolysaccharidoses (MPS) - Type 6 (黏多醣症第6型)
159Multiple Epiphyseal Dysplasia (MED) (多發性骨骺發育不全症)
160Multiple Pituitary Hormome Deficiency (MPHD) / Anterior Pituitary Hypoplasia (腦下垂體發育不全症)
161Multiple Sclerosis (MS) (多發性硬化症)
162Multiple System Atrophy (MSA) - Pakinsonian Subtype (多重系統退化症-非典型巴金森症)
163Multiple System Atrophy (MSA) - Type C (多重系統退化症-C型)
164Myasthenia Gravis (MG) (重症肌無力症)
165Myhre Syndrome (Myhre綜合症)