Disease Name Symbol Acronym
Obesity OBS005
Obesity with Impaired Prohormone Processing OBS011
Obesity, Adrenal Insufficiency, and Red Hair Due to Pomc Deficiency OBS020
Obesity, Association with OBS029
Obesity, Autosomal Dominant OBS023
Obesity, Early-onset OBS047
Obesity, Hyperphagia, and Developmental Delay OBS015
Obesity, Late-onset OBS016
Obesity, Mild, Early-onset OBS024
Obesity, Resistance to OBS018
Obesity, Severe, and Type Ii Diabetes OBS031
Obesity, Variation in OBS019
Obsessive-compulsive Disorder OBS002
Obsessive-compulsive Disorder 1 OBS026
Obsessive-compulsive Disorder, Protection Against OBS014
Obsessive-compulsive Personality Disorder OBS003 OCPD
Obstructive Hydrocephalus OBS004
Obstructive Jaundice OBS001
Obstructive Lung Disease OBS006
Occipital Horn Syndrome OCC006 OHS
Occipital Neuralgia OCC008
Occult Macular Dystrophy OCC002 OCMD
Occupational Dermatitis OCC001
Ochoa Syndrome OCH002 UFS
Ochronosis OCH001
Ocular Albinism OCL001
Ocular Albinism with Sensorineural Deafness OCL012
Ocular Albinism, Type I, Nettleship-falls Type OCL046
Ocular Albinism, X-linked OCL016 OA1
Ocular Cancer OCL009
Ocular Cicatricial Pemphigoid OCL020
Ocular Colobomas, Ichthyosis, Brain Malformations and Endocrine Abnormalities OCL021
Ocular Hypertension OCL006
Ocular Hypotension OCL010
Ocular Melanoma OCL022
Ocular Toxoplasmosis OCL025
Oculoauricular Syndrome OCL048
Oculocerebrorenal Syndrome OCL005 OCRL
Oculocutaneous Albinism OCL002 OCA
Oculocutaneous Albinism Type 1 OCL017 ATN
Oculocutaneous Albinism Type 2 OCL018 OCA2
Oculocutaneous Albinism Type 3 OCL036 OCA3
Oculocutaneous Albinism Type 4 OCL019 OCA4
Oculocutaneous Albinism, Type Ii, Modifier of,0 OCL049
Oculodentodigital Dysplasia OCL013 ODDD
Oculodentodigital Dysplasia, Autosomal Recessive OCL047
Oculofaciocardiodental Syndrome OCL014 MAA2
Oculomotor Apraxia OCL015
Oculomotor Apraxia, Congenital, Cogan-type OCL050
Oculomotor Nerve Paralysis OCL003
Oculopharyngeal Muscular Dystrophy OCL008 OPMD
Odontogenic Myxoma ODN005
Odontohypophosphatasia ODN002
Odontoma ODN006
Odontoonychodermal Dysplasia ODN009 OODD
Ogden Syndrome OGD001 NATD
Ogilvie Syndrome OGL001 ACPO
Oguchi Disease 1 OGC001
Oguchi Disease 2 OGC002
Ohtahara Syndrome OHT001
Okamoto Syndrome OKM001
Olecranon Bursitis OLC001
Olfactory Neuroblastoma OLF005
Oligoastrocytoma OLG006
Oligodendroglioma OLG002
Oligodontia OLG004
Oligodontia-colorectal Cancer Syndrome OLG005
Oligohydramnios OLG003
Oligospermia OLG001
Oliver Syndrome OLV002
Olivopontocerebellar Atrophy OLV001 OPCA
Ollier Disease OLL001
Olmsted Syndrome OLM001
Omenn Syndrome OMN001
Omodysplasia 1 OMD001 OMOD1
Omphalocele Exstrophy Imperforate Anus OMP002
Onchocerciasis ONC002
Oncogenic Osteomalacia ONC003 OO
Oophoritis OPH006
Open-angle Glaucoma OPN001
Ophthalmia Neonatorum OPH002
Ophthalmomyiasis OPH001
Ophthalmoplegia OPH004
Opiate Dependence OPT003
Opioid Abuse OPD001
Opisthorchiasis OPS001
Opitz G Syndrome OPT011
Opitz G Syndrome, Type I OPT038
Opitz G/bbb Syndrome OPT016
Opremazole Poor Metabolizer OPR001
Opsismodysplasia OPS002
Optic Atrophy OPT004
Optic Atrophy 2 OPT023 OPA2
Optic Atrophy 5 OPT024
Optic Atrophy 6 OPT025 OPA6
Optic Atrophy and Cataract OPT012
Optic Atrophy Polyneuropathy Deafness OPT028
Optic Atrophy Type 1 OPT015 DOA
Optic Atrophy Type 7 OPT035 OPA7
Optic Atrophy-4 OPT042
Optic Disk Drusen OPT001
Optic Nerve Coloboma with Renal Disease OPT013
Optic Nerve Disease OPT006
Optic Nerve Glioma OPT007
Optic Nerve Hypoplasia OPT037
Optic Nerve Hypoplasia and Abnormalities of the Central Nervous System OPT039
Optic Nerve Sheath Meningioma OPT002
Optic Neuritis OPT009
Optic Papillitis OPT010
Optic Pathway Glioma OPT032
Oral Cancer ORL011
Oral Candidiasis ORL005
Oral Cavity Cancer ORL007
Oral Leukoplakia ORL012
Oral Lichen Planus ORL013
Oral Squamous Cell Carcinoma ORL015
Oral Submucous Fibrosis ORL004
Oral Tuberculosis ORL003
Oral-facial-digital Syndrome ORL008
Oral-facial-digital Syndrome Type I ORL010 OFD1
Orbit Rhabdomyosarcoma ORB011
Orbital Cellulitis ORB006
Orbital Lymphangioma ORB014
Orbital Melanoma ORB015
Orbital Neoplasm ORB017
Orbital Plasma Cell Granuloma ORB008
Orchitis ORC001
Organic Acidemia ORG002
Organic Psychosis ORG005
Organophosphate Poisoning, Sensitivity to ORG004
Ornithine Carbamoyltransferase Deficiency ORN003 OTCD
Ornithinemia ORN004
Ornithosis ORN001
Orofacial Cleft ORF002
Orofacial Cleft 12 ORF020
Orofacial Cleft 4 ORF023
Orofacial Cleft 5 ORF014
Orofacial Cleft 7 ORF026
Orofacial Cleft 8 ORF016 OFC8
Orofacial Cleft 9 ORF024
Orofacial Cleft-1 ORF019
Orofacial Cleft-2 ORF021
Orofacial Cleft-3 ORF022
Orofaciodigital Syndrome ORF001 OFDS
Orolaryngeal Cancer ORL009
Orolaryngeal Cancer, Multiple ORL017
Oropharynx Cancer ORP003
Orotic Aciduria Type 1 ORT005 UMPS
Orthostatic Hypotension ORT006
Orthostatic Hypotensive Disorder of Streeten ORT003
Orthostatic Intolerance ORT004
Osgood-schlatter's Disease OSG001
Osseous Dysplasia OSS003
Osseous Dysplasia, Digital, with Facial Pigmentary Defects and Multiple Frenula OSS008
Osseous Heteroplasia OSS004
Ossification of Posterior Longitudinal Ligament of Spine OSS005 OPLL
Ossification of the Posterior Longitudinal Spinal Ligaments OSS009
Ossifying Fibroma OSS001
Ossifying Fibromyxoid Tumor OSS002
Osteitis Fibrosa OST004
Osteoarthritis OST012
Osteoarthritis of Distal Interphalangeal Joints OST020
Osteoarthritis Susceptibility 1 OST073
Osteoarthritis Susceptibility 2 OST070
Osteoarthritis Susceptibility 3 OST072
Osteoarthritis Susceptibility 4 OST071
Osteoarthritis Susceptibility 6 OST084
Osteoarthritis with Mild Chondrodysplasia OST062
Osteoblastoma OST006
Osteochondritis Dissecans OST009 OD
Osteochondrodysplasia OST015
Osteochondroma OST028
Osteochondrosis OST016
Osteofibrous Dysplasia OST032
Osteogenesis Imperfecta OST005 OI
Osteogenesis Imperfecta Type 4 OST038
Osteogenesis Imperfecta Type 6 OST040 OI6
Osteogenesis Imperfecta Type 7 OST041
Osteogenesis Imperfecta Type 8 OST042 OI8
Osteogenesis Imperfecta Type 9 OST043 OI 9
Osteogenesis Imperfecta Type I OST026
Osteogenesis Imperfecta Type Iib OST064
Osteogenesis Imperfecta Type Iii OST025
Osteogenesis Imperfecta, Type Ii OST080
Osteoglophonic Dysplasia OST044 OGD
Osteolysis OST021
Osteomalacia OST011
Osteomalacia, Tumor-induced OST074
Osteomyelitis OST017
Osteonecrosis OST003
Osteopathia Striata with Cranial Sclerosis OST022 OSCS
Osteopenia/osteoporosis OST023
Osteopetrosis OST001
Osteopetrosis Autosomal Dominant Type 1 OST049 OPTA1
Osteopetrosis Autosomal Dominant Type 2 OST050 ADOII
Osteopetrosis Autosomal Recessive 2 OST052 OPTB2
Osteopetrosis Autosomal Recessive 3 OST053 OPTB3
Osteopetrosis Autosomal Recessive 4 OST054 OPTB4
Osteopetrosis Autosomal Recessive 5 OST055 OPTB5
Osteopetrosis Autosomal Recessive 6 OST056 OPTB6
Osteopetrosis Autosomal Recessive 7 OST057 OPTB7
Osteopetrosis, Ad Type I OST075
Osteopetrosis, Autosomal Recessive 3, with Renal Tubular Acidosis OST069
Osteopetrosis, Recessive 1 OST083
Osteopoikilosis OST014
Osteoporosis OST002
Osteoporosis-pseudoglioma Syndrome OST024 OPS
Osteoporosis, Involutional OST082
Osteoporosis, Postmenopausal OST081
Osteoporosis, Postmenopausal, Susceptibility OST077
Osteoporotic Fracture OST097
Osteosarcoma OST018
Osteosarcoma, Somatic OST085
Osteosclerosis OST019
Osteosclerotic Myeloma OST008
Ostertagiasis OST007
Otitis Externa OTT001
Otitis Media OTT002
Otodental Dysplasia OTD001
Otof-related Deafness OTF001 DFNB9
Otofaciocervical Syndrome OTF002
Otomycosis OTM001
Otopalatodigital Spectrum Disorders OTP002
Otopalatodigital Syndrome OTP001
Otosclerosis OTS001
Otosclerosis 1 OTS005
Otosclerosis 2 OTS006
Otosclerosis 3 OTS007
Otosclerosis 4 OTS008
Otosclerosis 5 OTS009
Otosclerosis 7 OTS010
Otosclerosis 8 OTS011
Otosclerosis, Familial OTS004
Otospondylomegaepiphyseal Dysplasia OTS002 OSMED
Ovarian Benign Neoplasm OVR041
Ovarian Brenner Tumor OVR010
Ovarian Cancer OVR042
Ovarian Cancer, Serous OVR083
Ovarian Cancer, Somatic OVR078
Ovarian Carcinoma OVR043
Ovarian Carcinoma, Somatic OVR081
Ovarian Carcinosarcoma OVR044
Ovarian Clear Cell Adenocarcinoma OVR034
Ovarian Cyst OVR046
Ovarian Cystadenoma OVR048
Ovarian Cystic Teratoma OVR017
Ovarian Disease OVR049
Ovarian Dysgenesis OVR064
Ovarian Dysgenesis 1 OVR075
Ovarian Dysgenesis 2 OVR076
Ovarian Endometriosis OVR006
Ovarian Germ Cell Tumor OVR069
Ovarian Hyperstimulation Syndrome OVR029 OHSS
Ovarian Large-cell Neuroendocrine Carcinoma OVR005
Ovarian Lymphoma OVR021
Ovarian Mucinous Adenocarcinoma OVR011
Ovarian Mucinous Adenofibroma OVR053
Ovarian Mucinous Cystadenocarcinoma OVR013
Ovarian Mucinous Neoplasm OVR054
Ovarian Primitive Germ Cell Tumor OVR056
Ovarian Remnant Syndrome OVR073
Ovarian Response to Fsh Stimulation OVR079
Ovarian Serous Cystadenocarcinoma OVR012
Ovarian Serous Cystadenofibroma OVR002
Ovarian Sex Cord Tumors OVR065
Ovarian Small Cell Carcinoma OVR058
Ovarian Stromal Hyperthecosis OVR001
Ovarioleukodystrophy OVR066
Ovary Adenocarcinoma OVR059
Ovary Sarcoma OVR061
Ovary Serous Adenocarcinoma OVR062
Overgrowth Syndrome OVR082
Overnutrition OVR063
Oxyphilic Adenoma OXY002