• Obesity

• Obesity due to 6q16 deletion

• Obesity due to congenital leptin deficiency

• Obesity due to energy imbalance

• Obesity due to melanocortin-4 receptor deficiency

• Obesity due to pro-opiomelanocortin deficiency

• Obesity due to prohormone convertase-1 deficiency

• Obesity hypoventilation syndrome

• Obesity in adults

• Obesity in children or adolescents

• Obesity in infants or children up to 5 years of age

• Obesity in school-aged children or adolescents from 5 to 19 years

• Obesity with BMI 30.00-34.99

• Obesity with BMI 35.00-39.99

• Obesity with BMI greater than or equal to 40.00

• Oblique facial cleft

• Obscure gastrointestinal bleeding

• Obsessions

• Obsessive-compulsive disorder

• Obsessive-compulsive disorder with fair to good insight

• Obsessive-compulsive disorder with poor to absent insight

• Obsessive-compulsive or related disorders

• Obsessive-compulsive or related syndrome induced by other specified or multiple specified psychoactive substance

• Obsessive-compulsive or related syndrome induced by unknown or unspecified psychoactive substance

• Obstetric air embolism

• Obstetric blood-clot embolism

• Obstetric damage to pelvic joints or ligaments

• Obstetric death of unspecified cause

• Obstetric embolism

• Obstetric Fistula

• Obstetric haematoma of pelvis

• Obstetric high vaginal laceration alone

• Obstetric laceration of cervix

• Obstetrical tetanus

• Obstructed anomalous pulmonary venous pathway

• Obstructed intercourse

• Obstructed labour due to malposition or malpresentation of fetus

• Obstructed labour due to maternal pelvic abnormality

• Obstructed labour due to other causes

• Obstruction of duodenum

• Obstruction of gallbladder or bile ducts

• Obstruction of large intestine

• Obstruction of large intestine due to compression or stenosis

• Obstruction of peripheral vein

• Obstruction of small intestine

• Obstruction of small intestine due to compression or stenosis

• Obstruction of visceral vein

• Obstructive azoospermia

• Obstructive hypertrophic cardiomyopathy

• Obstructive ileus of small intestine due to impaction

• Obstructive neonatal apnoea

• Obstructive or reflux nephropathy

• Obstructive pancreatitis

• Occipital neuralgia

• Occipital osteodiastasis due to birth injury

• Occipitalisation of atlas

• Occupational acne or folliculitis

• Occupational acne or folliculitis due to exposure to mineral oils

• Occupational acne or folliculitis due to exposure to pitch or tar

• Occupational allergic contact dermatitis

• Occupational allergic contact urticaria

• Occupational callosities

• Occupational contact dermatitis

• Occupational contact dermatitis of hands

• Occupational contact dermatitis, contact urticaria or allergy

• Occupational halogen acne

• Occupational irritant contact dermatitis

• Occupational leukoderma

• Occupational melanosis

• Occupational photo-allergic contact dermatitis

• Occupational phototoxic reaction to skin contact with plant matter

• Occupational phototoxic reaction to skin contact with tar or tar derivatives

• Occupational phototoxic reactions to skin contact with exogenous photoactive agents

• Occupational protein contact dermatitis

• Occupational skin cancer

• Occupational tattoo

• Occupationally-acquired dermatosis due to exposure to cold

• Occupationally-acquired dermatosis due to heat

• Occupationally-acquired disorders of skin pigmentation

• Occupationally-acquired parasitic skin infestation, classified elsewhere

• Occupationally-acquired skin infection, classified elsewhere

• Occupationally-acquired skin infections or infestations

• Ochoa syndrome

• Ocular albinism - late-onset sensorineural deafness

• Ocular cicatricial pemphigoid

• Ocular cryptococcosis

• Ocular hypertension due to birth injury

• Ocular laceration or rupture with prolapse or loss of intraocular tissue, unilateral

• Ocular late syphilis

• Ocular motor nerve palsies

• Ocular myiasis

• Ocular myopathy

• Ocular rosacea

• Ocular sarcoidosis

• Ocular tilt reaction

• Oculo-cerebro-cutaneous syndrome

• Oculo-dento-digital dysplasia

• Oculo-digito-oesophageal-duodenal syndrome

• Oculo-facio-cardio-dental syndrome

• Oculo-osteo-cutaneous syndrome

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