| O10.91 | Unspecified pre-existing hypertension complicating pregnancy | NON-BILLABLE CODE |
| O10.911 | Unspecified pre-existing hypertension complicating pregnancy, first trimester | BILLABLE CODE |
| O10.912 | Unspecified pre-existing hypertension complicating pregnancy, second trimester | BILLABLE CODE |
| O10.913 | Unspecified pre-existing hypertension complicating pregnancy, third trimester | BILLABLE CODE |
| O10.919 | Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester | BILLABLE CODE |
| O10.92 | Unspecified pre-existing hypertension complicating childbirth | BILLABLE CODE |
| O10.93 | Unspecified pre-existing hypertension complicating the puerperium | BILLABLE CODE |
