ICD-10-CM > O00-O9A > O94-O9A > O98 > O98.1 O98.1 Syphilis complicating pregnancy, childbirth and the puerperium Non-Billable/Non-Specific Applicable To Conditions in A50-A53 Codes O98.11Syphilis complicating pregnancyO98.111Syphilis complicating pregnancy, first trimesterO98.112Syphilis complicating pregnancy, second trimesterO98.113Syphilis complicating pregnancy, third trimesterO98.119Syphilis complicating pregnancy, unspecified trimesterO98.12Syphilis complicating childbirthO98.13Syphilis complicating the puerperium