ICD-10-CM > O00-O9A > O20-O29 > O22 > O22.3 O22.3 Deep phlebothrombosis in pregnancy Non-Billable/Non-Specific Applicable To Deep vein thrombosis, antepartum Use Additional code to identify the deep vein thrombosis (I82.4-, I82.5-, I82.62-, I82.72-)code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01) Codes O22.30Deep phlebothrombosis in pregnancy, unspecified trimesterO22.31Deep phlebothrombosis in pregnancy, first trimesterO22.32Deep phlebothrombosis in pregnancy, second trimesterO22.33Deep phlebothrombosis in pregnancy, third trimester