|  | 
  | Obliteration | 
  |  | 
  |  | 
  |  | 
  | Obsession, obsessional 300.3 | 
  |  | 
  | Obsessive-compulsive 300.3 | 
  |  | 
  | Obstetrical trauma NEC (complicating delivery) 665.9 | 
  |  | 
  | Obstipation (see also Constipation) 564.00 | 
  |  | 
  | Obstruction, obstructed, obstructive | 
  |  | 
  | Obturator - see condition | 
  | Occlusal | 
  |  | 
  | Occlusion | 
  |  | 
  |  | 
  | Occupational | 
  |  | 
  |  | 
  | Ochronosis (alkaptonuric) (congenital) (endogenous) 270.2 | 
  |  | 
  | Ocular muscle - see also condition | 
  |  | 
  | Oculoauriculovertebral dysplasia 756.0 | 
  | Oculogyric | 
  |  | 
  |  | 
  | Oddi's sphincter spasm 576.5 | 
  | Odelberg's disease (juvenile osteochondrosis) 732.1 | 
  |  | 
  | Odontoameloblastoma (M9311/0) 213.1 | 
  |  | 
  |  | 
  |  | 
  |  | 
  | Odontodysplasia, regional 520.4 | 
  | Odontogenesis imperfecta 520.5 | 
  |  | 
  |  | 
  | Odontomyelitis (closed) (open) 522.0 | 
  |  | 
  |  | 
  | Odontosarcoma, ameloblastic (M9290/3) 170.1 | 
  |  | 
  |  | 
  |  | 
  | Oesophagostomum infestation 127.7 | 
  |  | 
  | Ogilvie's syndrome (sympathicotonic colon obstruction) 560.89 | 
  | Oguchi's disease (retina) 368.61 | 
  | Ohara's disease (see also Tularemia) 021.9 | 
  | Oidiomycosis (see also Candidiasis) 112.9 | 
  | Oidiomycotic meningitis 112.83 | 
  | Oidium albicans infection (see also Candidiasis) 112.9 | 
  |  | 
  |  | 
  | Olfactory - see condition | 
  |  | 
  | Oligergasia (see also Retardation, mental) 319 | 
  |  | 
  |  | 
  | Oligoastrocytoma, mixed (M9382/3) | 
  |  | 
  |  | 
  | Oligodendroblastoma (M9460/3) | 
  |  | 
|  |  |