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