| ICD-10 Code | Description |
| O10.011 | Pre-existing essential hypertension complicating pregnancy, first trimester |
| O10.012 | Pre-existing essential hypertension complicating pregnancy, second trimester |
| O10.013 | Pre-existing essential hypertension complicating pregnancy, third trimester |
| O10.019 | Pre-existing essential hypertension complicating pregnancy, unspecified trimester |
| O10.02 | Pre-existing essential hypertension complicating childbirth |
| O10.03 | Pre-existing essential hypertension complicating the puerperium |
| O10.111 | Pre-existing hypertensive heart disease complicating pregnancy, first trimester |
| O10.112 | Pre-existing hypertensive heart disease complicating pregnancy, second trimester |
| O10.113 | Pre-existing hypertensive heart disease complicating pregnancy, third trimester |
| O10.119 | Pre-existing hypertensive heart disease complicating pregnancy, unspecified trimester |
| O10.12 | Pre-existing hypertensive heart disease complicating childbirth |
| O10.13 | Pre-existing hypertensive heart disease complicating the puerperium |
| O10.211 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, first trimester |
| O10.212 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, second trimester |
| O10.213 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, third trimester |
| O10.219 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, unspecified trimester |
| O10.22 | Pre-existing hypertensive chronic kidney disease complicating childbirth |
| O10.23 | Pre-existing hypertensive chronic kidney disease complicating the puerperium |
| O10.311 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, first trimester |
| O10.312 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimester |
| O10.313 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester |
| O10.319 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, unspecified trimester |
| O10.32 | Pre-existing hypertensive heart and chronic kidney disease complicating childbirth |
| O10.33 | Pre-existing hypertensive heart and chronic kidney disease complicating the puerperium |
| O10.411 | Pre-existing secondary hypertension complicating pregnancy, first trimester |
| O10.412 | Pre-existing secondary hypertension complicating pregnancy, second trimester |
| O10.413 | Pre-existing secondary hypertension complicating pregnancy, third trimester |
| O10.419 | Pre-existing secondary hypertension complicating pregnancy, unspecified trimester |
| O10.42 | Pre-existing secondary hypertension complicating childbirth |
| O10.43 | Pre-existing secondary hypertension complicating the puerperium |
| 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 |
| O10.92 | Unspecified pre-existing hypertension complicating childbirth |
| O10.93 | Unspecified pre-existing hypertension complicating the puerperium |
