ICD-10-CM > O00-O9A > O20-O29 > O22 > O22.5 O22.5 Cerebral venous thrombosis in pregnancy Non-Billable/Non-Specific Applicable To Cerebrovenous sinus thrombosis in pregnancy Codes O22.50Cerebral venous thrombosis in pregnancy, unspecified trimesterO22.51Cerebral venous thrombosis in pregnancy, first trimesterO22.52Cerebral venous thrombosis in pregnancy, second trimesterO22.53Cerebral venous thrombosis in pregnancy, third trimester