--- O30.131 Triplet pregnancy, trichorionic/triamniotic, first trimester

--- O30.132 Triplet pregnancy, trichorionic/triamniotic, second trimester

--- O30.133 Triplet pregnancy, trichorionic/triamniotic, third trimester

--- O30.139 Triplet pregnancy, trichorionic/triamniotic, unspecified trimester