ICD-10-CM 2027 diagnosis code
O43.231Placenta percreta, first trimester
O43.231 is a valid, billable ICD-10-CM code for placenta percreta, first trimester. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 O43.231
O43.231 is the ICD-10-CM diagnosis code for placenta percreta, first trimester. It belongs to category O43 (placental disorders), 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within O43.23 (placenta percreta), O43.231 is specifically for placenta percreta, first trimester. Related codes cover second trimester (O43.232), third trimester (O43.233) and unspecified trimester (O43.239).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 769 (Postpartum and Post Abortion Diagnoses with O.R. Procedures, relative weight 1.6673) and DRG 776 (Postpartum and Post Abortion Diagnoses without O.R. Procedures, relative weight 0.6721), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
The Medicare Code Editor treats this as a maternity diagnosis, expected only for patients age 9 through 64.
It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 667.02 (retained placenta without hemorrhage, delivered, with mention of postpartum complication) and 667.04 (retained placenta without hemorrhage, postpartum condition or complication).
Notes that apply from higher levels
Instructions written at a parent level also apply to O43.231.
› From O43 Placental disorders
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 14 · Pregnancy, Childbirth and the Puerperium
MDC 14 · Pregnancy, Childbirth and the Puerperium
ICD-9-CM equivalent
Converter →- 667.02Retained placenta without hemorrhage, delivered, with mention of postpartum complicationapproximate
- 667.04Retained placenta without hemorrhage, postpartum condition or complicationapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
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 O43.231
Is O43.231 billable?
- Yes. O43.231 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can O43.231 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict O43.231 as a principal diagnosis.
Is O43.231 a CC or MCC?
- No. O43.231 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does O43.231 group to?
- O43.231 is used in the MS-DRG v44.0 logic for MS-DRG 769 (Postpartum and Post Abortion Diagnoses with O.R. Procedures) and MS-DRG 776 (Postpartum and Post Abortion Diagnoses without O.R. Procedures). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for O43.231?
- The CMS General Equivalence Mappings map O43.231 to ICD-9-CM 667.02 and 667.04.