ICD-10-CM > O00-O9A > O20-O29 > O23 > O23.5 > O23.51 O23.51 Infection of cervix in pregnancy Non-Billable/Non-Specific Codes O23.511Infections of cervix in pregnancy, first trimesterO23.512Infections of cervix in pregnancy, second trimesterO23.513Infections of cervix in pregnancy, third trimesterO23.519Infections of cervix in pregnancy, unspecified trimester