| O1221 | Gestational edema with proteinuria, first trimester |
| O1222 | Gestational edema with proteinuria, second trimester |
| O1223 | Gestational edema with proteinuria, third trimester |
| O1224 | Gestational edema with proteinuria, complicating childbirth |
| O1225 | Gestational edema with proteinuria, complicating the puerperium |
| O13 | Gestational [pregnancy-induced] hypertension without significant proteinuria |
| O131 | Gestational htn w/o significant proteinuria, first trimester Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimester |
| O132 | Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimester |
| O133 | Gestational htn w/o significant proteinuria, third trimester Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimester |
| O134 | Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating childbirth |
| O135 | Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating the puerperium |
| O139 | Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester |
| O14 | Pre-eclampsia |
| O140 | Mild to moderate pre-eclampsia |
| O1400 | Mild to moderate pre-eclampsia, unspecified trimester |
| O1402 | Mild to moderate pre-eclampsia, second trimester |
| O1403 | Mild to moderate pre-eclampsia, third trimester |
| O1404 | Mild to moderate pre-eclampsia, complicating childbirth |
| O1405 | Mild to moderate pre-eclampsia, complicating the puerperium |
| O141 | Severe pre-eclampsia |
| O1410 | Severe pre-eclampsia, unspecified trimester |
| O1412 | Severe pre-eclampsia, second trimester |
| O1413 | Severe pre-eclampsia, third trimester |
| O1414 | Severe pre-eclampsia complicating childbirth |
| O1415 | Severe pre-eclampsia, complicating the puerperium |
| O142 | HELLP syndrome |
| O1420 | HELLP syndrome (HELLP), unspecified trimester |
| O1422 | HELLP syndrome (HELLP), second trimester |
| O1423 | HELLP syndrome (HELLP), third trimester |
| O1424 | HELLP syndrome, complicating childbirth |
| O1425 | HELLP syndrome, complicating the puerperium |
| O149 | Unspecified pre-eclampsia |
| O1490 | Unspecified pre-eclampsia, unspecified trimester |
| O1492 | Unspecified pre-eclampsia, second trimester |
| O1493 | Unspecified pre-eclampsia, third trimester |
| O1494 | Unspecified pre-eclampsia, complicating childbirth |
| O1495 | Unspecified pre-eclampsia, complicating the puerperium |
| O15 | Eclampsia |
| O150 | Eclampsia complicating pregnancy |
| O1500 | Eclampsia complicating pregnancy, unspecified trimester |
| O1502 | Eclampsia complicating pregnancy, second trimester |
| O1503 | Eclampsia complicating pregnancy, third trimester |
| O151 | Eclampsia complicating labor |
| O152 | Eclampsia complicating the puerperium |
| O159 | Eclampsia, unspecified as to time period |
| O16 | Unspecified maternal hypertension |
| O161 | Unspecified maternal hypertension, first trimester |
| O162 | Unspecified maternal hypertension, second trimester |
| O163 | Unspecified maternal hypertension, third trimester |
| O164 | Unspecified maternal hypertension, complicating childbirth |