ICD-10-CM > O00-O9A > O30-O48 > O30 > O30.1 > O30.13 O30.13 Triplet pregnancy, trichorionic/triamniotic Non-Billable/Non-Specific Codes O30.131Triplet pregnancy, trichorionic/triamniotic, first trimesterO30.132Triplet pregnancy, trichorionic/triamniotic, second trimesterO30.133Triplet pregnancy, trichorionic/triamniotic, third trimesterO30.139Triplet pregnancy, trichorionic/triamniotic, unspecified trimester