2026 ICD-10-CM Diagnosis Code O45.011Premature separation of placenta with afibrinogenemia, first trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O45

ICD-10-CM O45.011
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O45.011 is a billable ICD-10-CM diagnosis code for premature separation of placenta with afibrinogenemia, first 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
O45.011
Billable Status
Yes — Valid for Submission
Code Describes
Premature separation of placenta with afibrinogenemia, first trimester
Short Description
Prem separtn of placenta w afibrinogenemia, first trimester
Parent Code
O45.01
Premature separation of placenta with afibrinogenemia

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 CodeO45.011Premature separation of placenta with afibrinogenemia, first trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O45.011.

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).

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

Bleeding Disorders

Normally, if you get hurt, your body forms a blood clot to stop the bleeding. For blood to clot, your body needs cells called platelets and proteins known as clotting factors. If you have a bleeding disorder, you either do not have enough platelets or clotting factors or they don't work the way they should.

Read the full article at MedlinePlus

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

Convert O45.011 to ICD-9-CMHistory

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

ICD-9-CM
641.31 Coag def hemorr-deliver
Approximate The match is approximate rather than exact.
ICD-9-CM
641.33 Coag def hemorr-antepart
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 O45.011Overview

Is O45.011 (Premature separation of placenta with afibrinogenemia) a billable code?

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

What MS-DRG does O45.011 group to?

When premature separation of placenta with afibrinogenemia, first 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 O45.011 be reported for?

The Medicare Code Editor checks premature separation of placenta with afibrinogenemia, first 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 O45.011?

Under the General Equivalence Mappings, premature separation of placenta with afibrinogenemia, first trimester converts to ICD-9-CM 641.31 (coag def hemorr-deliver) and 641.33 (coag def hemorr-antepart). 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.