ICD-10-CM > O00-O9A > O20-O29 > O22 > O22.9 O22.9 Venous complication in pregnancy, unspecified Non-Billable/Non-Specific Applicable To Gestational phlebitis NOSGestational phlebopathy NOSGestational thrombosis NOS Codes O22.90Venous complication in pregnancy, unspecified, unspecified trimesterO22.91Venous complication in pregnancy, unspecified, first trimesterO22.92Venous complication in pregnancy, unspecified, second trimesterO22.93Venous complication in pregnancy, unspecified, third trimester