• Arhinencephaly 742.2
  • Arias-Stella phenomenon 621.30
  • Ariboflavinosis 266.0
  • Arizona enteritis 008.1
  • Arm - see condition
  • Armenian disease 277.31
  • Arnold-Chiari obstruction or syndrome (see also Spina bifida) 741.0
  • Arousals
  • Arrest, arrested
  • Arrhenoblastoma (M8630/1)
  • Arrhinencephaly 742.2
  • Arrhythmia (auricle) (cardiac) (cordis) (gallop rhythm) (juvenile) (nodal) (reflex) (sinus) (supraventricular) (transitory) (ventricle) 427.9
  • Arrillaga-Ayerza syndrome (pulmonary artery sclerosis with pulmonary hypertension) 416.0
  • Arsenical
  • Arsenism 985.1
  • Arterial - see condition
  • Arteriectasis 447.8
  • Arteriofibrosis - see Arteriosclerosis
  • Arteriolar sclerosis - see Arteriosclerosis
  • Arteriolith - see Arteriosclerosis
  • Arteriolitis 447.6
  • Arteriolosclerosis - see Arteriosclerosis