ICD-10-CM 2027 diagnosis code
O43Placental disorders
O43 is a header code, so it can't be reported by itself. Choose one of the 5 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 O43
O43 is the ICD-10-CM diagnosis code for placental disorders. It belongs to block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: O43.0 (syndromes), O43.1 (placenta), O43.2 (placenta), O43.8 (disorders) and O43.9 (disorder).
The conditions in its Excludes2 note aren't part of O43, but may be coded alongside it if the patient has both: maternal care for poor fetal growth due to placental insufficiency (O36.5-), placenta previa (O44.-), placental polyp (O90.89), placentitis (O41.14-) and 1 more.
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 O43
- O43.0Placental transfusion syndromes
- O43.01Fetomaternal placental transfusion syndrome
- O43.011Fetomaternal placental transfusion syndrome, first trimesterBillable
- O43.012Fetomaternal placental transfusion syndrome, second trimesterBillable
- O43.013Fetomaternal placental transfusion syndrome, third trimesterBillable
- O43.019Fetomaternal placental transfusion syndrome, unspecified trimesterBillable
- O43.02Fetus-to-fetus placental transfusion syndrome
- O43.021Fetus-to-fetus placental transfusion syndrome, first trimesterBillable
- O43.022Fetus-to-fetus placental transfusion syndrome, second trimesterBillable
- O43.023Fetus-to-fetus placental transfusion syndrome, third trimesterBillable
- O43.029Fetus-to-fetus placental transfusion syndrome, unspecified trimesterBillable
- O43.01Fetomaternal placental transfusion syndrome
- O43.1Malformation of placenta
- O43.2Morbidly adherent placenta
- O43.8Other placental disorders
- O43.9Unspecified placental disorder
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to O43.
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
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 O43
Is O43 billable?
- No. O43 is a header code. Report one of its more specific subcodes instead.