ICD-10-CM > O00-O9A > O20-O29 > O26 > O26.9 O26.9 Pregnancy related conditions, unspecified Non-Billable/Non-Specific Codes O26.90Pregnancy related conditions, unspecified, unspecified trimesterO26.91Pregnancy related conditions, unspecified, first trimesterO26.92Pregnancy related conditions, unspecified, second trimesterO26.93Pregnancy related conditions, unspecified, third trimester