O30: Multiple gestation
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O31: Complications specific to multiple gestation
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O32: Maternal care for known or suspected malpresentation of fetus
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O33: Maternal care for known or suspected disproportion
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O34: Maternal care for known or suspected abnormality of pelvic organs
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O35: Maternal care for known or suspected fetal abnormality and damage
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O36: Maternal care for other known or suspected fetal problems
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O40: Polyhydramnios
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O41: Other disorders of amniotic fluid and membranes
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O42: Premature rupture of membranes
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O43: Placental disorders
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O44: Placenta praevia
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O45: Premature separation of placenta [abruptio placentae]
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O46: Antepartum haemorrhage, not elsewhere classified
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O47: False labour
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O48: Prolonged pregnancy
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