2025 ICD-10-CM Diseases and Injuries - Index "O"
The ICD-10-CM Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s). To find the ICD-10-CM code for a specific condition browse this alphabetical index of clinical terms and conditions. Keep in mind that a condition may not appear under the exact same phrasing so make sure to use synonyms. Once you have identified the condition the ICD-10-CM code(s) should be listed next to that condition.
- Obermeyer's relapsing fever (European)
- Obesity
- Oblique
- Obliteration
- Observation (following) (for) (without need for further medical care)
- Obsession, obsessional state
- Obsessive-compulsive neurosis or reaction
- Obstetric embolism, septic
- Obstetrical trauma (complicating delivery)
- Obstipation
- See: Constipation;
- Obstruction, obstructed, obstructive
- Obturator
- Occlusal wear, teeth
- Occlusio pupillae
- See: Membrane, pupillary;
- Occlusion, occluded
- Occult
- Occupational
- Ochlophobia
- Ochronosis (endogenous)
- Ocular muscle
- Oculogyric crisis or disturbance
- Oculomotor syndrome
- Oculopathy
- Oddi's sphincter spasm
- Odontalgia
- Odontoameloblastoma
- Odontoclasia
- Odontodysplasia, regional
- Odontogenesis imperfecta
- Odontoma (ameloblastic) (complex) (compound) (fibroameloblastic)
- Odontomyelitis (closed) (open)
- Odontorrhagia
- Odontosarcoma, ameloblastic
- Oestriasis
- See: Myiasis;
- Oguchi's disease
- Ohara's disease
- OHS (obesity hypoventilation syndrome)
- Oidiomycosis
- See: Candidiasis;
- Oidium albicans infection
- See: Candidiasis;
- Old (previous) myocardial infarction
- Old age (without mention of debility)
- Olfactory
- Oligemia
- See: Anemia;
- Oligoastrocytoma
- Oligocythemia
- Oligodendroblastoma
- Oligodendroglioma
- Oligodontia
- See: Anodontia;
- Oligoencephalon
- Oligohidrosis
- Oligohydramnios
- Oligohydrosis
- Oligomenorrhea
- Oligophrenia
- See Also: Disability, intellectual;
- Oligospermia
- Oligotrichia
- See: Alopecia;
- Oliguria
- Ollier's disease
- Omentitis
- See: Peritonitis;
- Omentocele
- Omentum, omental
- Omphalitis (congenital) (newborn)
- Omphalocele
- Omphalomesenteric duct, persistent
- Omphalorrhagia, newborn
- Omsk hemorrhagic fever
- Onanism (excessive)
- Onchocerciasis, onchocercosis
- Oncocytoma
- Oncovirus, as cause of disease classified elsewhere
- Ondine's curse
- See: Apnea, sleep;
- Oneirophrenia
- Onychauxis
- Onychia
- See Also: Cellulitis, digit;
- Onychitis
- See Also: Cellulitis, digit;
- Onychocryptosis
- Onychodystrophy
- Onychogryphosis, onychogryposis
- Onycholysis
- Onychomadesis
- Onychomalacia
- Onychomycosis (finger) (toe)
- Onycho-osteodysplasia
- Onychophagia
- Onychophosis
- Onychoptosis
- Onychorrhexis
- Onychoschizia
- Onyxis (finger) (toe)
- Onyxitis
- See Also: Cellulitis, digit;
- Oophoritis (cystic) (infectional) (interstitial)
- Oophorocele
- Opacity, opacities
- Opalescent dentin (hereditary)
- Open, opening
- Operational fatigue
- Operative
- Operculitis
- See: Periodontitis;
- Operculum
- See: Break, retina;
- Ophiasis
- Ophthalmia
- See Also: Conjunctivitis;
- Ophthalmitis
- Ophthalmocele (congenital)
- Ophthalmoneuromyelitis
- Ophthalmoplegia
- See Also: Strabismus, paralytic;
- Opioid (s)
- Opisthognathism
- Opisthorchiasis (felineus) (viverrini)
- Opitz' disease
- Opiumism
- See: Dependence, drug, opioid;
- Oppenheim's disease
- Oppenheim-Urbach disease (necrobiosis lipoidica diabeticorum)
- See: E08-E13 with .620;
- Optic nerve
- Orbit
- Orchioblastoma
- Orchitis (gangrenous) (nonspecific) (septic) (suppurative)
- Orf (virus disease)
- Organic
- Orgasm
- Oriental
- Orifice
- Origin of both great vessels from right ventricle
- Ormond's disease (with ureteral obstruction)
- Ornithine metabolism disorder
- Ornithinemia (Type I) (Type II)
- Ornithosis
- Orotaciduria, oroticaciduria (congenital) (hereditary) (pyrimidine deficiency)
- Orthodontics
- Orthopnea
- Orthopoxvirus
- Os, uterus
- Osgood-Schlatter disease or osteochondrosis
- Osler (-Weber)-Rendu disease
- Osler's nodes
- Osmidrosis
- Osseous
- Ossification
- Osteitis
- See Also: Osteomyelitis;
- Osteoarthritis
- Osteoarthropathy (hypertrophic)
- Osteoarthrosis (degenerative) (hypertrophic) (joint)
- Osteoblastoma
- See: Neoplasm, bone, benign;
- Osteochondritis
- See Also: Osteochondropathy, by site;
- Osteochondroarthrosis deformans endemica
- See: Disease, Kaschin-Beck;
- Osteochondrodysplasia
- Osteochondrodystrophy
- Osteochondrolysis
- Osteochondroma
- See: Neoplasm, bone, benign;
- Osteochondromatosis
- Osteochondromyxosarcoma
- Osteochondropathy
- Osteochondrosarcoma
- Osteochondrosis
- See Also: Osteochondropathy, by site;
- Osteoclastoma
- Osteodynia
- Osteodystrophy
- Osteofibroma
- See: Neoplasm, bone, benign;
- Osteofibrosarcoma
- Osteogenesis imperfecta
- Osteogenic
- Osteolysis
- Osteoma
- See Also: Neoplasm, bone, benign;
- Osteomalacia
- Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis)
- Osteomyelofibrosis
- Osteomyelosclerosis
- Osteonecrosis
- Osteo-onycho-arthro-dysplasia
- Osteo-onychodysplasia, hereditary
- Osteopathia condensans disseminata
- Osteopathy
- See Also: Osteomyelitis, Osteonecrosis, Osteoporosis;
- Osteopenia
- Osteoperiostitis
- Osteopetrosis (familial)
- Osteophyte
- Osteopoikilosis
- Osteoporosis (female) (male)
- Osteopsathyrosis (idiopathica)
- Osteoradionecrosis, jaw (acute) (chronic) (lower) (suppurative) (upper)
- Osteosarcoma (any form)
- Osteosclerosis
- Osteosclerotic anemia
- Osteosis
- Ostium
- Ostrum-Furst syndrome
- Otalgia
- Otitis (acute)
- Otocephaly
- Otolith syndrome
- Otomycosis (diffuse) NEC
- Otoporosis
- See: Otosclerosis;
- Otorrhagia (nontraumatic)
- Otorrhea
- Otosclerosis (general)
- Otospongiosis
- See: Otosclerosis;
- Otto's disease or pelvis
- Outcome of delivery
- Outlet
- Ovalocytosis (congenital) (hereditary)
- See: Elliptocytosis;
- Ovarian
- Ovariocele
- Ovaritis (cystic)
- See: Oophoritis;
- Ovary, ovarian
- Overactive
- Overactivity
- Overbite (deep) (excessive) (horizontal) (vertical)
- Overbreathing
- See: Hyperventilation;
- Overconscientious personality
- Overdevelopment
- See: Hypertrophy;
- Overdistension
- See: Distension;
- Overdose, overdosage (drug)
- Overeating
- Overexertion (effects) (exhaustion)
- Overexposure (effects)
- Overfeeding
- Overfill, endodontic
- Overgrowth
- Overhanging of dental restorative material (unrepairable)
- Overheated (places) (effects)
- See: Heat;
- Overjet (excessive horizontal)
- Overlaid, overlying (suffocation)
- Overlap, excessive horizontal (teeth)
- Overlapping toe (acquired)
- See Also: Deformity, toe, specified NEC;
- Overload
- Overnutrition
- Overproduction
- Overprotection, child by parent
- Overriding
- Overstrained
- Overuse, muscle NEC
- Overweight
- Overworked
- Oviduct
- Ovotestis
- Ovulation (cycle)
- Ovum
- Owren's disease or syndrome (parahemophilia)
- Ox heart
- See: Hypertrophy, cardiac;
- Oxalosis
- Oxaluria
- Oxycephaly, oxycephalic
- Oxyuriasis
- Oxyuris vermicularis (infestation)
- Ozena
