ICD-10-CM > O00-O9A > O20-O29 > O24 > O24.8 O24.8 Other pre-existing 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 O24.81Other pre-existing diabetes mellitus in pregnancyO24.811Other pre-existing diabetes mellitus in pregnancy, first trimesterO24.812Other pre-existing diabetes mellitus in pregnancy, second trimesterO24.813Other pre-existing diabetes mellitus in pregnancy, third trimesterO24.819Other pre-existing diabetes mellitus in pregnancy, unspecified trimesterO24.82Other pre-existing diabetes mellitus in childbirthO24.83Other pre-existing diabetes mellitus in the puerperium