• Oculogyric
  • Oculomotor syndrome 378.81
  • Oddi's sphincter spasm 576.5
  • Odelberg's disease (juvenile osteochondrosis) 732.1
  • Odontalgia 525.9
  • Odontoameloblastoma (M9311/0) 213.1
  • Odontoclasia 521.05
  • Odontoclasis 873.63
  • Odontodysplasia, regional 520.4
  • Odontogenesis imperfecta 520.5
  • Odontoma (M9280/0) 213.1
  • Odontomyelitis (closed) (open) 522.0
  • Odontonecrosis 521.09
  • Odontorrhagia 525.8
  • Odontosarcoma, ameloblastic (M9290/3) 170.1
  • Odynophagia 787.20
  • Oesophagostomiasis 127.7
  • Oesophagostomum infestation 127.7
  • Oestriasis 134.0
  • Ogilvie's syndrome (sympathicotonic colon obstruction) 560.89
  • Oguchi's disease (retina) 368.61
  • Ohara's disease (see also Tularemia) 021.9