• Universal
  • Unknown
  • Unna's disease (seborrheic dermatitis) 690.10
  • Unresponsiveness, adrenocorticotropin (ACTH) 255.41
  • Unsatisfactory
  • Unsoundness of mind (see also Psychosis) 298.9
  • Unspecified cause of death 799.9
  • Unstable
  • Untruthfulness, child problem (see also Disturbance, conduct) 312.0
  • Unverricht (-Lundborg) disease, syndrome, or epilepsy 345.1
  • Unverricht-Wagner syndrome (dermatomyositis) 710.3
  • Upper respiratory - see condition
  • Upset
  • Urachus - see also condition
  • Uratic arthritis 274.00
  • Urbach's lipoid proteinosis 272.8
  • Urbach-Oppenheim disease or syndrome (necrobiosis lipoidica diabeticorum) 250.8 [709.3]
  • Urbach-Wiethe disease or syndrome (lipoid proteinosis) 272.8
  • Urban yellow fever 060.1
  • Urea, blood, high - see Uremia
  • Uremia, uremic (absorption) (amaurosis) (amblyopia) (aphasia) (apoplexy) (coma) (delirium) (dementia) (dropsy) (dyspnea) (fever) (intoxication) (mania) (paralysis) (poisoning) (toxemia) (vomiting) 586
  • Ureter, ureteral - see condition