| O36.1910 | Maternal care for other isoimmunization, first trimester, not applicable or unspecified | BILLABLE CODE |
| O36.1911 | Maternal care for other isoimmunization, first trimester, fetus 1 | BILLABLE CODE |
| O36.1912 | Maternal care for other isoimmunization, first trimester, fetus 2 | BILLABLE CODE |
| O36.1913 | Maternal care for other isoimmunization, first trimester, fetus 3 | BILLABLE CODE |
| O36.1914 | Maternal care for other isoimmunization, first trimester, fetus 4 | BILLABLE CODE |
| O36.1915 | Maternal care for other isoimmunization, first trimester, fetus 5 | BILLABLE CODE |
| O36.1919 | Maternal care for other isoimmunization, first trimester, other fetus | BILLABLE CODE |
