2026 ICD-10-CM Diagnosis Code O36.4XX1Maternal care for intrauterine death, fetus 1

ICD-10-CM Codes›O00-O9A›O30-O48›O36

ICD-10-CM O36.4XX1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O36.4XX1 is a billable ICD-10-CM diagnosis code for maternal care for intrauterine death, fetus 1. The 7th character 1 identifies fetus 1 in a multiple gestation pregnancy. 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 Other specified complications in pregnancy.

Code Identity

ICD-10-CM Code
O36.4XX1
Billable Status
Yes — Valid for Submission
Code Describes
Maternal care for intrauterine death, fetus 1
Short Description
Maternal care for intrauterine death, fetus 1
Same as the full description in the CMS dataset.
Parent Code
O36.4
Maternal care for intrauterine death

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO36Maternal care for other fetal problems
This CodeO36.4XX1Maternal care for intrauterine death, fetus 1

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O36.4XX1.

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 PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Stillbirth

If you lose a fetus at or after the 20th week of pregnancy, it's called a stillbirth. A stillbirth can occur before or during delivery and may be considered as:

The full article covers:

  • What is a stillbirth?
  • What are the risk factors for stillbirth?
  • What are the possible causes of stillbirth?
  • How is a stillbirth diagnosed?
  • How do health care providers manage a stillbirth?

Read the full article at MedlinePlus

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

Convert O36.4XX1 to ICD-9-CMHistory

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

ICD-9-CM
656.41 Intrauter death-deliver
Approximate The match is approximate rather than exact.
ICD-9-CM
656.43 Intrauter death-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 O36.4XX1Overview

Is O36.4XX1 (Maternal care for intrauterine death) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report maternal care for intrauterine death, fetus 1 on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character 1 in O36.4XX1 mean?

The final character 1 identifies the fetus in a multiple gestation pregnancy: this code reports maternal care for intrauterine death for fetus 1.

What MS-DRG does O36.4XX1 group to?

When maternal care for intrauterine death, fetus 1 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 O36.4XX1 be reported for?

The Medicare Code Editor checks maternal care for intrauterine death, fetus 1 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 O36.4XX1?

Under the General Equivalence Mappings, maternal care for intrauterine death, fetus 1 converts to ICD-9-CM 656.41 (intrauter death-deliver) and 656.43 (intrauter death-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.