O26 - Maternal care for other conditions predominantly related to pregnancy
O26.9 - Pregnancy related conditions, unspecified
O26.90 - Pregnancy related conditions, unspecified, unspecified trimester
O26.91 - Pregnancy related conditions, unspecified, first trimester
O26.92 - Pregnancy related conditions, unspecified, second trimester
O26.93 - Pregnancy related conditions, unspecified, third trimester