O24.4Gestational diabetes mellitus

O24.4 is the ICD-10-CM diagnosis code for gestational diabetes mellitus. 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), O24.4 is specifically for gestational diabetes mellitus. Related codes cover pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium (O24.0), 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), 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: O24.41 (in pregnancy), O24.42 (in childbirth) and O24.43 (in the puerperium).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.