| O10.41 | Pre-existing secondary hypertension complicating pregnancy | NON-BILLABLE CODE |
| O10.411 | Pre-existing secondary hypertension complicating pregnancy, first trimester | BILLABLE CODE |
| O10.412 | Pre-existing secondary hypertension complicating pregnancy, second trimester | BILLABLE CODE |
| O10.413 | Pre-existing secondary hypertension complicating pregnancy, third trimester | BILLABLE CODE |
| O10.419 | Pre-existing secondary hypertension complicating pregnancy, unspecified trimester | BILLABLE CODE |
| O10.42 | Pre-existing secondary hypertension complicating childbirth | BILLABLE CODE |
| O10.43 | Pre-existing secondary hypertension complicating the puerperium | BILLABLE CODE |
