ICD-10-CM > O00-O9A > O85-O92 > O88 > O88.2 > O88.21 O88.21 Thromboembolism in pregnancy Non-Billable/Non-Specific Applicable To Obstetric (pulmonary) embolism NOS Codes O88.211Thromboembolism in pregnancy, first trimesterO88.212Thromboembolism in pregnancy, second trimesterO88.213Thromboembolism in pregnancy, third trimesterO88.219Thromboembolism in pregnancy, unspecified trimester