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ICD-10-CM 2027 diagnosis code

O24.42Gestational diabetes mellitus in childbirth

Not billable — use a more specific code

O24.42 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 O24.42

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

To report this condition, pick the subcode that matches the documentation: O24.420 (diet controlled), O24.424 (insulin controlled), O24.425 (controlled by oral hypoglycemic drugs) and O24.429 (unspecified control).

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 O24.42

Notes that apply from higher levels

Instructions written at a parent level also apply to O24.42.

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

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O24.42

Is O24.42 billable?

No. O24.42 is a header code. Report one of its more specific subcodes instead.