O10: Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
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O11: Pre-eclampsia superimposed on chronic hypertension
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O12: Gestational [pregnancy-induced] oedema and proteinuria without hypertension
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O13: Gestational [pregnancy-induced] hypertension
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O14: Pre-eclampsia
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O15: Eclampsia
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O16: Unspecified maternal hypertension
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