2027 ICD-10-CM Diagnosis Code O43.211Placenta accreta, first trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O43

ICD-10-CM O43.211
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O43.211 is a billable ICD-10-CM diagnosis code for placenta accreta, first trimester. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 769, 776. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Maternal care related to disorders of the placenta and placental implantation.

Code Identity

ICD-10-CM Code
O43.211
Billable Status
Yes — Valid for Submission
Code Describes
Placenta accreta, first trimester
Short Description
Placenta accreta, first trimester
Same as the full description in the CMS dataset.
Parent Code
O43.21
Placenta accreta

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO43Placental disorders
This CodeO43.211Placenta accreta, first trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O43.211.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O43.211: its own notes plus those printed at O43.2, O43, and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From O43.2 Morbidly adherent placenta applies to 12 codes
  • retained placenta (O73.-)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From O43 Placental disorders applies to 48 codes
  • maternal care for poor fetal growth due to placental insufficiency (O36.5-)
  • placenta previa (O44.-)
  • placental polyp (O90.89)
  • placentitis (O41.14-)
  • premature separation of placenta [abruptio placentae] (O45.-)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From O43.2 Morbidly adherent placenta applies to 12 codes
  • associated third stage postpartum hemorrhage, if applicable (O72.0)

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O43.211, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming O43.211: they are not reported together with it, unless the two conditions are unrelated.

  • O73 Retained placenta and membranes, without hemorrhage
    placenta accreta (O43.21-) names O43.21-, which includes this code

Code Also 1

These codes say O43.211 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • O72.0 Third-stage hemorrhage
    type of adherent placenta (O43.2-) names O43.2-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG018
Maternal care related to disorders of the placenta and placental implantation
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Placenta Accreta

    abnormal placentation in which all or parts of the placenta are attached directly to the myometrium due to a complete or partial absence of decidua. it is associated with postpartum hemorrhage because of the failure of placental separation.

Patient EducationClinical

Health Problems in Pregnancy

A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.

The full article covers:

  • What are health problems in pregnancy?
  • What raises my risk for health problems during pregnancy?
  • Can chronic health conditions cause problems in pregnancy?
  • Can health problems in pregnancy be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert O43.211 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
667.02 Retnd plac NOS-del w p/p
Approximate The match is approximate rather than exact.
ICD-9-CM
667.04 Retain plac NOS-postpart
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O43.211Overview

What is the ICD-10 code for placenta accreta, first trimester?

The ICD-10-CM code for placenta accreta, first trimester is O43.211 (sometimes written as O43211). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O43.211 (Placenta accreta) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report placenta accreta, first trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O43.211 group to?

When placenta accreta, first trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 769, 776, with relative weights from 0.6718 to 1.6666 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O43.211 be reported for?

The Medicare Code Editor checks placenta accreta, first trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Can O43.211 be reported with a code from O73?

Not as a rule. The Excludes1 note at O43.2, which applies to O43.211, lists "retained placenta (O73.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).