| O24.31 | Unspecified pre-existing diabetes mellitus in pregnancy | NON-BILLABLE CODE |
| O24.311 | Unspecified pre-existing diabetes mellitus in pregnancy, first trimester | BILLABLE CODE |
| O24.312 | Unspecified pre-existing diabetes mellitus in pregnancy, second trimester | BILLABLE CODE |
| O24.313 | Unspecified pre-existing diabetes mellitus in pregnancy, third trimester | BILLABLE CODE |
| O24.319 | Unspecified pre-existing diabetes mellitus in pregnancy, unspecified trimester | BILLABLE CODE |
| O24.32 | Unspecified pre-existing diabetes mellitus in childbirth | BILLABLE CODE |
| O24.33 | Unspecified pre-existing diabetes mellitus in the puerperium | BILLABLE CODE |
