2026 ICD-10-CM Diagnosis Code O46.003Antepartum hemorrhage with coagulation defect, unspecified, third trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O46

ICD-10-CM O46.003
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O46.003 is a billable ICD-10-CM diagnosis code for antepartum hemorrhage with coagulation defect, unspecified, third 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 Hemorrhage after first trimester.

Code Identity

ICD-10-CM Code
O46.003
Billable Status
Yes — Valid for Submission
Code Describes
Antepartum hemorrhage with coagulation defect, unspecified, third trimester
Short Description
Antepartum hemorrhage w coag defect, unsp, third trimester
Parent Code
O46.00
Antepartum hemorrhage with coagulation defect, unspecified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO46Antepartum hemorrhage, not elsewhere classified
This CodeO46.003Antepartum hemorrhage with coagulation defect, unspecified, third trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O46.003.

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 PRG010
Hemorrhage after first trimester
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 O46.003 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 O46.003Overview

Is O46.003 (Antepartum hemorrhage with coagulation defect, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report antepartum hemorrhage with coagulation defect, unspecified, third trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O46.003 group to?

When antepartum hemorrhage with coagulation defect, unspecified, third 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 O46.003 be reported for?

The Medicare Code Editor checks antepartum hemorrhage with coagulation defect, unspecified, third 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 O46.003?

Under the General Equivalence Mappings, antepartum hemorrhage with coagulation defect, unspecified, third 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.