Bicuspid aortic valve  746.4 | 
   | 
  Bielschowsky's disease  330.1 | 
  Bielschowsky-Jansky  | 
   | 
  Biemond's syndrome (obesity, polydactyly, and mental retardation)  759.89 | 
  Biermer's anemia or disease (pernicious anemia)  281.0 | 
   | 
  Bifid (congenital) - see also Imperfect, closure  | 
   | 
  Biforis uterus (suprasimplex)  752.3 | 
  Bifurcation (congenital) - see also Imperfect, closure  | 
   | 
   | 
   | 
  Big spleen syndrome  289.4 | 
  Bilateral - see condition  | 
  Bile duct - see condition  | 
  Bile pigments in urine  791.4 | 
  Bilharziasis (see also Schistosomiasis)  120.9 | 
   | 
  Biliary - see condition  | 
  Bilious (attack) - see also Vomiting  | 
   | 
   | 
   | 
  Billroth's disease  | 
   | 
  Bilobate placenta - see Placenta, abnormal  | 
  Bilocular  | 
   | 
  Bing-Horton syndrome (histamine cephalgia)  339.00 | 
  Binswanger's disease or dementia  290.12 | 
  Biörck (-Thorson) syndrome (malignant carcinoid)  259.2 | 
  Biparta, bipartite - see also Imperfect, closure  | 
   | 
  Bird  | 
   | 
  Bird's disease (oxaluria)  271.8 | 
  Birth  | 
   | 
   | 
  Birt-Hogg-Dube syndrome  759.89 | 
   | 
   | 
  Bite(s)  | 
   | 
  Biting  | 
   | 
  Black  | 
   | 
  Blackfan-Diamond anemia or syndrome (congenital hypoplastic anemia)  284.01 | 
   | 
   | 
   | 
  Bladder - see condition  | 
  Blast  | 
   | 
  Blastomycosis, blastomycotic (chronic) (cutaneous) (disseminated) (lung) (pulmonary) (systemic)  116.0 | 
   | 
   | 
   | 
  Bleeder (familial) (hereditary) (see also Defect, coagulation)  286.9 | 
   | 
  Bleeding (see also Hemorrhage)  459.0 | 
   | 
  Blennorrhagia, blennorrhagic - see Blennorrhea  | 
  Blennorrhea (acute)  098.0 | 
   | 
 |  |