2026 ICD-10-CM Diagnosis Code O45.90Premature separation of placenta, unspecified, unspecified trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O45

ICD-10-CM O45.90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O45.90 is a billable ICD-10-CM diagnosis code for premature separation of placenta, unspecified, unspecified trimester. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 817 through 819, 831 through 833. 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 Early, first or unspecified trimester hemorrhage; and Maternal care related to disorders of the placenta and placental implantation.

Code Identity

ICD-10-CM Code
O45.90
Billable Status
Yes — Valid for Submission
Code Describes
Premature separation of placenta, unspecified, unspecified trimester
Short Description
Premature separation of placenta, unsp, unsp trimester
Parent Code
O45.9
Premature separation of placenta, unspecified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO45Premature separation of placenta [abruptio placentae]
This CodeO45.90Premature separation of placenta, unspecified, unspecified trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O45.90.

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).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Antepartum hemorrhage, abruptio placentae and placenta previa
  • Bleeding from female genital tract during pregnancy
  • Detached products of conception
  • Fetal disorder due to maternal antepartum hemorrhage
  • Fetal disorder due to maternal hemorrhage during pregnancy
  • Fetal disorder due to placental abruption
  • Fetal disorder due to placental hemorrhage
  • Placenta previa with hemorrhage
  • Placental abruption

Clinical ClassificationClinical

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

CCSR PRG009
Early, first or unspecified trimester hemorrhage
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG018
Maternal care related to disorders of the placenta and placental implantation
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Childbirth Problems

Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:

Read the full article at MedlinePlus

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

Convert O45.90 to ICD-9-CMHistory

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

ICD-9-CM
641.20 Prem separ placen-unspec
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O45.90Overview

Is O45.90 (Premature separation of placenta, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report premature separation of placenta, unspecified, unspecified trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O45.90 group to?

When premature separation of placenta, unspecified, unspecified trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O45.90 be reported for?

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

What is the ICD-9 equivalent of O45.90?

Under the General Equivalence Mappings, premature separation of placenta, unspecified, unspecified trimester converts to ICD-9-CM 641.20 (prem separ placen-unspec). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.