• Undernutrition 269.9
  • Underweight 783.22
  • Underwood's disease (sclerema neonatorum) 778.1
  • Undescended - see also Malposition, congenital
  • Undetermined diagnosis or cause 799.9
  • Undeveloped, undevelopment - see also Hypoplasia
  • Undiagnosed (disease) 799.9
  • Undulant fever (see also Brucellosis) 023.9
  • Unemployment, anxiety concerning V62.0
  • Unequal leg (acquired) (length) 736.81
  • Unerupted teeth, tooth 520.6
  • Unextracted dental root 525.3
  • Unguis incarnatus 703.0
  • Unicornis uterus 752.33
  • Unicornuate uterus (with or without a separate uterine horn) 752.33
  • Unicorporeus uterus 752.39
  • Uniformis uterus 752.39
  • Unilateral - see also condition
  • Unilateralis uterus 752.39
  • Unilocular heart 745.8
  • Uninhibited bladder 596.54
  • Union, abnormal - see also Fusion