• Merycism - see also Vomiting
  • Merzbacher-Pelizaeus disease 330.0
  • Mesaortitis - see Aortitis
  • Mesarteritis - see Arteritis
  • Mesencephalitis (see also Encephalitis) 323.9
  • Mesenchymoma (M8990/1) - see also Neoplasm, connective tissue, uncertain behavior
  • Mesenteritis
  • Mesentery, mesenteric - see condition
  • Mesio-occlusion 524.23
  • Mesiodens, mesiodentes 520.1
  • Mesocardia (with asplenia) 746.87
  • Mesocolon - see condition
  • Mesonephroma (malignant) (M9110/3) - see also Neoplasm, by site, malignant
  • Mesophlebitis - see Phlebitis
  • Mesostromal dysgenesis 743.51
  • Mesothelioma (malignant) (M9050/3) - see also Neoplasm, by site, malignant
  • Metabolic syndrome 277.7
  • Metabolism disorder 277.9
  • Metagonimiasis 121.5
  • Metagonimus infestation (small intestine) 121.5
  • Metal
  • Metalliferous miners' lung 503