• Araneism 989.5
  • Arboencephalitis, Australian 062.4
  • Arbor virus, arbovirus (infection) NEC 066.9
  • Arborization block (heart) 426.6
  • ARC 042
  • Arc-welders' lung 503
  • Arc-welders' syndrome (photokeratitis) 370.24
  • Arcadiacus amorphus 759.89
  • Arches - see condition
  • Arcuatus uterus 752.3
  • Arcus (cornea)
  • Areflexia 796.1
  • Areola - see condition
  • Argentaffinoma (M8241/1) - see also Neoplasm, by site, uncertain behavior
  • Argentinian hemorrhagic fever 078.7
  • Arginosuccinicaciduria 270.6
  • Argonz-Del Castillo syndrome (nonpuerperal galactorrhea and amenorrhea) 253.1
  • Argyll-Robertson phenomenon, pupil, or syndrome (syphilitic) 094.89
  • Argyria, argyriasis NEC 985.8
  • Arhinencephaly 742.2
  • Arias-Stella phenomenon 621.30
  • Ariboflavinosis 266.0