History of hypertension icd 10 code July 8, 2019 16 32 64 128 Family history of hypertension icd 10 code History of gestational hypertension icd 10 code History of hypertension icd 10 cm code Icd 10 code for history of hypertension in pregnancy History of hypertension icd 10 Icd 10 code history of htn