| Tussis convulsiva (see also Whooping cough) 033.9 | 
  | Twiddler's syndrome (due to) | 
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  | Twin | 
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  | Twist, twisted | 
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  | Tympanites (abdominal) (intestine) 787.3 | 
  | Tympanitis - see Myringitis | 
  |  | 
  |  | 
  | Tympanum - see condition | 
  | Tympany | 
  |  | 
  | Typhlitis (see also Appendicitis) 541 | 
  |  | 
  |  | 
  | Typhoid (abortive) (ambulant) (any site) (fever) (hemorrhagic) (infection) (intermittent) (malignant) (rheumatic) 002.0 | 
  |  | 
  | Typhomalaria (fever) (see also Malaria) 084.6 | 
  |  | 
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  |  | 
  |  | 
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  | Tyrosinosis (Medes) (Sakai) 270.2 | 
  |  | 
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  | Uehlinger's syndrome (acropachyderma) 757.39 | 
  | Uhl's anomaly or disease (hypoplasia of myocardium, right ventricle) 746.84 | 
  | Ulcer, ulcerated, ulcerating, ulceration, ulcerative 707.9 | 
  |  | 
  | Ulcerosa scarlatina 034.1 | 
  | Ulcus - see also Ulcer | 
  |  | 
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  | Ulerythema | 
  |  | 
  | Ullrich (-Bonnevie) (-Turner) syndrome 758.6 | 
  | Ullrich-Feichtiger syndrome 759.89 | 
  | Ulnar - see condition | 
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  | Umbilicus, umbilical - see also condition | 
  |  | 
  | Unacceptable | 
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  | Unavailability of medical facilities (at) V63.9 | 
  |  | 
  | Uncinaria americana infestation 126.1 | 
  | Uncinariasis (see also Ancylostomiasis) 126.9 | 
  | Unconscious, unconsciousness 780.09 | 
  | Underdevelopment - see also Undeveloped sexual 259.0 | 
  |  | 
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  | Under observation - see Observation | 
  |  | 
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  | Underwood's disease (sclerema neonatorum) 778.1 | 
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