ICD-10-CM > O00-O9A > O85-O92 > O88 > O88.2 O88.2 Obstetric thromboembolism Non-Billable/Non-Specific Codes O88.21Thromboembolism in pregnancyO88.211Thromboembolism in pregnancy, first trimesterO88.212Thromboembolism in pregnancy, second trimesterO88.213Thromboembolism in pregnancy, third trimesterO88.219Thromboembolism in pregnancy, unspecified trimesterO88.22Thromboembolism in childbirthO88.23Thromboembolism in the puerperium