| O10 | Pre-existing hypertension complicating pregnancy, childbirth and the puerperium |
| O10.0 | Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium |
| O10.01 | Pre-existing essential hypertension complicating pregnancy, |
| 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 |
| O10.1 | Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium |
| O10.11 | Pre-existing hypertensive heart disease complicating pregnancy |
| 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 |
| O10.2 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium |
| O10.21 | Pre-existing hypertensive chronic kidney disease complicating pregnancy |
| 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 |
| O10.3 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium |
| O10.31 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy |
| 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 |
| O10.4 | Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium |
| O10.41 | Pre-existing secondary hypertension complicating pregnancy |
| 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 |
| O10.9 | 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 |
| O10.92 | Unspecified pre-existing hypertension complicating childbirth |
| O10.93 | Unspecified pre-existing hypertension complicating the puerperium |
| O11 | Pre-existing hypertension with pre-eclampsia |
| O11.1 | Pre-existing hypertension with pre-eclampsia, first trimester |
| O11.2 | Pre-existing hypertension with pre-eclampsia, second trimester |
| O11.3 | Pre-existing hypertension with pre-eclampsia, third trimester |
| O11.9 | Pre-existing hypertension with pre-eclampsia, unspecified trimester |
| O12 | Gestational [pregnancy-induced] edema and proteinuria without hypertension |
| O12.0 | Gestational edema |
| O12.00 | Gestational edema, unspecified trimester |
| O12.01 | Gestational edema, first trimester |
| O12.02 | Gestational edema, second trimester |
| O12.03 | Gestational edema, third trimester |
| O12.1 | Gestational proteinuria |
| O12.10 | Gestational proteinuria, unspecified trimester |
| O12.11 | Gestational proteinuria, first trimester |
| O12.12 | Gestational proteinuria, second trimester |
| O12.13 | Gestational proteinuria, third trimester |
| O12.2 | Gestational edema with proteinuria |
| O12.20 | Gestational edema with proteinuria, unspecified trimester |
| O12.21 | Gestational edema with proteinuria, first trimester |
| O12.22 | Gestational edema with proteinuria, second trimester |
| O12.23 | Gestational edema with proteinuria, third trimester |
| O13 | Gestational [pregnancy-induced] hypertension without significant proteinuria |
| O13.1 | Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimester |
| O13.2 | Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimester |
| O13.3 | Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimester |
| O13.9 | Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester |
| O14 | Pre-eclampsia |
| O14.0 | Mild to moderate pre-eclampsia |
| O14.00 | Mild to moderate pre-eclampsia, unspecified trimester |
| O14.02 | Mild to moderate pre-eclampsia, second trimester |
| O14.03 | Mild to moderate pre-eclampsia, third trimester |
| O14.1 | Severe pre-eclampsia |
| O14.10 | Severe pre-eclampsia, unspecified trimester |
| O14.12 | Severe pre-eclampsia, second trimester |
| O14.13 | Severe pre-eclampsia, third trimester |
| O14.2 | HELLP syndrome |
| O14.20 | HELLP syndrome (HELLP), unspecified trimester |
| O14.22 | HELLP syndrome (HELLP), second trimester |
| O14.23 | HELLP syndrome (HELLP), third trimester |
| O14.9 | Unspecified pre-eclampsia |
| O14.90 | Unspecified pre-eclampsia, unspecified trimester |
| O14.92 | Unspecified pre-eclampsia, second trimester |
| O14.93 | Unspecified pre-eclampsia, third trimester |
| O15 | Eclampsia |
| O15.0 | Eclampsia in pregnancy |
| O15.00 | Eclampsia in pregnancy, unspecified trimester |
| O15.02 | Eclampsia in pregnancy, second trimester |
| O15.03 | Eclampsia in pregnancy, third trimester |
| O15.1 | Eclampsia in labor |
| O15.2 | Eclampsia in the puerperium |
| O15.9 | Eclampsia, unspecified as to time period |
| O16 | Unspecified maternal hypertension |
| O16.1 | Unspecified maternal hypertension, first trimester |
| O16.2 | Unspecified maternal hypertension, second trimester |
| O16.3 | Unspecified maternal hypertension, third trimester |
| O16.9 | Unspecified maternal hypertension, unspecified trimester |