O24.0Pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium

O24.0 is the ICD-10-CM diagnosis code for pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium. It belongs to category O24 (diabetes mellitus in pregnancy, childbirth, and the puerperium), block O20-O29 (other maternal disorders predominantly related to pregnancy) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within O24 (diabetes mellitus in pregnancy, childbirth, and the puerperium), O24.0 is specifically for pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium. Related codes cover pre-existing type 2 diabetes mellitus, in pregnancy, childbirth and the puerperium (O24.1), unspecified pre-existing diabetes mellitus in pregnancy, childbirth and the puerperium (O24.3), gestational diabetes mellitus (O24.4), other pre-existing diabetes mellitus in pregnancy, childbirth, and the puerperium (O24.8) and unspecified diabetes mellitus in pregnancy, childbirth and the puerperium (O24.9).

To report this condition, pick the subcode that matches the documentation: O24.01 (pregnancy), O24.02 (childbirth) and O24.03 (puerperium).

Use an additional code from category E10 to further identify any manifestations.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2017 (title revised).