122Maple Syrup Urine Disease (MSUD) (楓糖尿症)
123Marfan Syndrome (MFS) (馬凡氏症)
124McCune-Albright Syndrome (MAS) (纖維性骨失養症)
125Medulloblastoma (髓母細胞瘤)
126Melanomae / Eye Ciliary Body Tumor (眼睫狀體黑色素瘤)
127Mesothelioma (間皮瘤)
128Methylmalonic Acidemia (MMA) (甲基丙二酸血症)
129Mitochondrial Cardiomyopathy (線粒體心肌病變)
130Mitochondrial Disease (線粒體病)
131Mixed Gonadal Dysgenesis (混合型性腺發育不良)
132Moebius Syndrome (莫比斯症候群)
133Monoclonal Gammopathies (單克隆免疫球蛋白沉積病)
134Motor Neuron Disease (MND) (運動神經元病)
135Mowat-Wilson Syndrome (MWS)
136Mucopolysaccharidoses (MPS) - Type 2 (黏多醣症第2型)
137Mucopolysaccharidoses (MPS) - Type 3 (黏多醣症第3型)
138Mucopolysaccharidoses (MPS) - Type 4 (黏多醣症第4型)
139Mucopolysaccharidoses (MPS) - Type 4A (黏多醣症第4A型)
140Mucopolysaccharidoses (MPS) - Type 6 (黏多醣症第6型)
141Multiple Epiphyseal Dysplasia (MED) (多發性骨骺發育不全症)