ICD-10-CM > O00-O9A > O20-O29 > O23 > O23.1 O23.1 Infections of bladder in pregnancy Non-Billable/Non-Specific Codes O23.10Infections of bladder in pregnancy, unspecified trimesterO23.11Infections of bladder in pregnancy, first trimesterO23.12Infections of bladder in pregnancy, second trimesterO23.13Infections of bladder in pregnancy, third trimester