• Ballooning posterior leaflet syndrome 424.0
  • Baló's disease or concentric sclerosis 341.1
  • Bamberger's disease (hypertrophic pulmonary osteoarthropathy) 731.2
  • Bamberger-Marie disease (hypertrophic pulmonary osteoarthropathy) 731.2
  • Bamboo spine 720.0
  • Bancroft's filariasis 125.0
  • Band(s)
  • Bandemia (without diagnosis of specific infection) 288.66
  • Bandl's ring (contraction)
  • Bang's disease (Brucella abortus) 023.1
  • Bangkok hemorrhagic fever 065.4
  • Bannister's disease 995.1
  • Bantam-Albright-Martin disease (pseudohypoparathyroidism) 275.49
  • Banti's disease or syndrome (with cirrhosis) (with portal hypertension) - see Cirrhosis, liver
  • Bar
  • Baragnosis 780.99
  • Barasheh, barashek 266.2
  • Barcoo disease or rot (see also Ulcer, skin) 707.9
  • Bard-Pic syndrome (carcinoma, head of pancreas) 157.0
  • Bärensprung's disease (eczema marginatum) 110.3
  • Baritosis 503
  • Barium lung disease 503