• AAT (alpha-1 antitrypsin) deficiency 273.4
  • AAV (disease) (illness) (infection) - see Human immunodeficiency virus (disease) (illness) (infection)
  • Abactio - see Abortion, induced
  • Abactus venter - see Abortion, induced
  • Abarognosis 781.99
  • Abasia (-astasia) 307.9
  • Abderhalden-Kaufmann-Lignac syndrome (cystinosis) 270.0
  • Abdomen, abdominal - see also condition
  • Abdominalgia 789.0
  • Abduction contracture, hip or other joint - see Contraction, joint
  • Abercrombie's syndrome (amyloid degeneration) 277.3
  • Aberrant (congenital) - see also Malposition, congenital
  • Aberratio
  • Aberration - see also Anomaly
  • Abetalipoproteinemia 272.5
  • Abionarce 780.79
  • Abiotrophy 799.89
  • Ablatio
  • Ablation
  • Ablepharia, ablepharon, ablephary 743.62
  • Ablepsia - see Blindness
  • Ablepsy - see Blindness