| O165 | Unspecified maternal hypertension, complicating the puerperium |
| O169 | Unspecified maternal hypertension, unspecified trimester |
| O20 | Hemorrhage in early pregnancy |
| O200 | Threatened abortion |
| O208 | Other hemorrhage in early pregnancy |
| O209 | Hemorrhage in early pregnancy, unspecified |
| O21 | Excessive vomiting in pregnancy |
| O210 | Mild hyperemesis gravidarum |
| O211 | Hyperemesis gravidarum with metabolic disturbance |
| O212 | Late vomiting of pregnancy |
| O218 | Other vomiting complicating pregnancy |
| O219 | Vomiting of pregnancy, unspecified |
| O22 | Venous complications and hemorrhoids in pregnancy |
| O220 | Varicose veins of lower extremity in pregnancy |
| O2200 | Varicose veins of lower extremity in pregnancy, unspecified trimester |
| O2201 | Varicose veins of lower extremity in pregnancy, first trimester |
| O2202 | Varicose veins of lower extremity in pregnancy, second trimester |
| O2203 | Varicose veins of lower extremity in pregnancy, third trimester |
| O221 | Genital varices in pregnancy |
| O2210 | Genital varices in pregnancy, unspecified trimester |
| O2211 | Genital varices in pregnancy, first trimester |
| O2212 | Genital varices in pregnancy, second trimester |
| O2213 | Genital varices in pregnancy, third trimester |
| O222 | Superficial thrombophlebitis in pregnancy |
| O2220 | Superficial thrombophlebitis in pregnancy, unspecified trimester |
| O2221 | Superficial thrombophlebitis in pregnancy, first trimester |
| O2222 | Superficial thrombophlebitis in pregnancy, second trimester |
| O2223 | Superficial thrombophlebitis in pregnancy, third trimester |
| O223 | Deep phlebothrombosis in pregnancy |
| O2230 | Deep phlebothrombosis in pregnancy, unspecified trimester |
| O2231 | Deep phlebothrombosis in pregnancy, first trimester |
| O2232 | Deep phlebothrombosis in pregnancy, second trimester |
| O2233 | Deep phlebothrombosis in pregnancy, third trimester |
| O224 | Hemorrhoids in pregnancy |
| O2240 | Hemorrhoids in pregnancy, unspecified trimester |
| O2241 | Hemorrhoids in pregnancy, first trimester |
| O2242 | Hemorrhoids in pregnancy, second trimester |
| O2243 | Hemorrhoids in pregnancy, third trimester |
| O225 | Cerebral venous thrombosis in pregnancy |
| O2250 | Cerebral venous thrombosis in pregnancy, unspecified trimester |
| O2251 | Cerebral venous thrombosis in pregnancy, first trimester |
| O2252 | Cerebral venous thrombosis in pregnancy, second trimester |
| O2253 | Cerebral venous thrombosis in pregnancy, third trimester |
| O228 | Other venous complications in pregnancy |
| O228X | Other venous complications in pregnancy |
| O228X1 | Other venous complications in pregnancy, first trimester |
| O228X2 | Other venous complications in pregnancy, second trimester |
| O228X3 | Other venous complications in pregnancy, third trimester |
| O228X9 | Other venous complications in pregnancy, unspecified trimester |
| O229 | Venous complication in pregnancy, unspecified |