O24.3Unspecified pre-existing diabetes mellitus in pregnancy, childbirth and the puerperium

O24.3 is the ICD-10-CM diagnosis code for unspecified pre-existing 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, choose O24.3 (Unspecified pre-existing diabetes mellitus in pregnancy, childbirth and the puerperium) only when documentation doesn't support a more specific option: 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), 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: O24.31 (pregnancy), O24.32 (childbirth) and O24.33 (puerperium).

Use an additional code (for): from category E11 to further identify any manifestation, injectable non-insulin antidiabetic drugs (Z79.85) and long-term (current) use of insulin (Z79.4).

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