Ulerythema  | 
   | 
  Ullrich (-Bonnevie) (-Turner) syndrome  758.6 | 
  Ullrich-Feichtiger syndrome  759.89 | 
  Ulnar - see condition  | 
   | 
   | 
  Umbilicus, umbilical - see also condition  | 
   | 
  Unacceptable  | 
   | 
  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 | 
   | 
   | 
   | 
  Under observation - see Observation  | 
   | 
   | 
  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 | 
   | 
   | 
  Unicorporeus uterus  752.3 | 
   | 
  Unilateral - see also condition  | 
   | 
  Unilateralis uterus  752.3 | 
   | 
   | 
   | 
  Union, abnormal - see also Fusion  | 
   | 
  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  333.2 | 
  Unverricht-Wagner syndrome (dermatomyositis)  710.3 | 
  Upper respiratory - see condition  | 
  Upset  | 
   | 
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