ICD-10-CM > O00-O9A > O20-O29 > O24 > O24.9 O24.9 Unspecified diabetes mellitus in pregnancy, childbirth and the puerperium Non-Billable/Non-Specific Use Additional code (for):from categories E08, E09 and E13 to further identify any manifestationinjectable non-insulin antidiabetic drugs (Z79.85)long-term (current) use of insulin (Z79.4) Codes O24.91Unspecified diabetes mellitus in pregnancyO24.911Unspecified diabetes mellitus in pregnancy, first trimesterO24.912Unspecified diabetes mellitus in pregnancy, second trimesterO24.913Unspecified diabetes mellitus in pregnancy, third trimesterO24.919Unspecified diabetes mellitus in pregnancy, unspecified trimesterO24.92Unspecified diabetes mellitus in childbirthO24.93Unspecified diabetes mellitus in the puerperium