| O36.91X0 | Maternal care for fetal problem, unspecified, first trimester, not applicable or unspecified | BILLABLE CODE |
| O36.91X1 | Maternal care for fetal problem, unspecified, first trimester, fetus 1 | BILLABLE CODE |
| O36.91X2 | Maternal care for fetal problem, unspecified, first trimester, fetus 2 | BILLABLE CODE |
| O36.91X3 | Maternal care for fetal problem, unspecified, first trimester, fetus 3 | BILLABLE CODE |
| O36.91X4 | Maternal care for fetal problem, unspecified, first trimester, fetus 4 | BILLABLE CODE |
| O36.91X5 | Maternal care for fetal problem, unspecified, first trimester, fetus 5 | BILLABLE CODE |
| O36.91X9 | Maternal care for fetal problem, unspecified, first trimester, other fetus | BILLABLE CODE |
