ICD-10-CM 2027 diagnosis code

O24.81Other pre-existing diabetes mellitus in pregnancy

Not billable — use a more specific code

O24.81 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O24.81

O24.81 is the ICD-10-CM diagnosis code for other pre-existing diabetes mellitus in pregnancy. 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 4 subcodes must be used instead.

Within O24.8 (other pre-existing diabetes mellitus in pregnancy, childbirth, and the puerperium), O24.81 is specifically for other pre-existing diabetes mellitus in pregnancy. Related codes cover childbirth (O24.82) and the puerperium (O24.83).

To report this condition, pick the subcode that matches the documentation: O24.811 (first trimester), O24.812 (second trimester), O24.813 (third trimester) and O24.819 (unspecified trimester).

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

Specific codes under O24.81

Notes that apply from higher levels

Instructions written at a parent level also apply to O24.81.

› From O24.8 Other pre-existing diabetes mellitus in pregnancy, childbirth, and the puerperium

Use additional code

code (for):
from categories E08, E09 and E13 to further identify any manifestation
injectable non-insulin antidiabetic drugs (Z79.85)
long-term (current) use of insulin (Z79.4)

Broader instructions also apply from O20-O29 Other maternal disorders predominantly related to pregnancy and Chapter 15: Pregnancy, childbirth and the puerperium.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to O24.81.

Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › diabetes (mellitus) › pre-existing › specified NEC

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about O24.81

Is O24.81 billable?: No. O24.81 is a header code. Report one of its more specific subcodes instead.