| Upper respiratory - see condition | 
  | Upset | 
  |  | 
  | Urachus - see also condition | 
  |  | 
  |  | 
  | 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 | 
  |  | 
  | 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 | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  | Ureterostomy status V44.6 | 
  |  | 
  | Urethra, urethral - see condition | 
  |  | 
  | Urethritis (abacterial) (acute) (allergic) (anterior) (chronic) (nonvenereal) (posterior) (recurrent) (simple) (subacute) (ulcerative) (undifferentiated) 597.80 | 
  |  | 
  | Urethrocele | 
  |  | 
  |  | 
  | Urethro-oculoarticular syndrome 099.3 | 
  | Urethro-oculosynovial syndrome 099.3 | 
  | Urethrorectal - see condition | 
  |  | 
  |  | 
  | Urethrostomy status V44.6 | 
  |  | 
  |  | 
  | Urethrovaginal - see condition | 
  |  | 
  | Uric acid | 
  |  | 
  |  | 
  |  | 
  |  | 
  | Urination | 
  |  | 
  | Urine, urinary - see also condition | 
  |  | 
  | Urinemia - see Uremia | 
  |  | 
  |  | 
  | Uroarthritis, infectious 099.3 | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  | Urticarioides acarodermatitis 133.9 | 
  | Use of | 
  |  | 
  | Usher-Senear disease (pemphigus erythematosus) 694.4 | 
|  |  |