O10.9 - Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium
O10.91 - Unspecified pre-existing hypertension complicating pregnancy
O10.911 - Unspecified pre-existing hypertension complicating pregnancy, first trimester
O10.912 - Unspecified pre-existing hypertension complicating pregnancy, second trimester
O10.913 - Unspecified pre-existing hypertension complicating pregnancy, third trimester
O10.919 - Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester