2026 ICD-10-CM Diagnosis Code O31.10X0Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified

ICD-10-CM Codes›O00-O9A›O30-O48›O31

ICD-10-CM O31.10X0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O31.10X0 is a billable ICD-10-CM diagnosis code for continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified. The 7th character 0 shows this applies to a single gestation, or that the affected fetus is not identified. 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). Coders also document this condition as continuing pregnancy after abortion of one fetus or more. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Multiple gestation.

Code Identity

ICD-10-CM Code
O31.10X0
Billable Status
Yes — Valid for Submission
Code Describes
Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified
Short Description
Cont preg aft spon abort of one fts or more, unsp tri, unsp
Parent Code
O31.10
Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO31Complications specific to multiple gestation
This CodeO31.10X0Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O31.10X0.

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.

  • Continuing pregnancy after abortion of one fetus or more
  • Continuing pregnancy after abortion of sibling fetus
  • Continuing pregnancy after intrauterine death of one or more fetuses
  • Continuing triplet pregnancy after spontaneous abortion of one or more fetuses
  • Multiple pregnancy with one fetal loss
  • Triplet pregnancy
  • Triplet pregnancy with antenatal problem
  • Vanishing twin syndrome

Clinical ClassificationClinical

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

CCSR PRG012
Multiple gestation
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Triplet Pregnancy

    a pregnancy involving three fetuses.

Patient EducationClinical

Miscarriage

A miscarriage is an unexpected loss of pregnancy before the 20th week. Most miscarriages happen very early in the pregnancy, often before a woman even knows she is pregnant.

The full article covers:

  • What is a miscarriage?
  • What causes a miscarriage?
  • What are the signs of a miscarriage?
  • How is a miscarriage diagnosed?
  • What is the treatment for a miscarriage?
  • Can a miscarriage be prevented?

Read the full article at MedlinePlus

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

Convert O31.10X0 to ICD-9-CMHistory

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

ICD-9-CM
651.30 Twins w fetal loss-unsp
Approximate The match is approximate rather than exact.
ICD-9-CM
651.60 Mult ges w fet loss-unsp
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 O31.10X0Overview

Is O31.10X0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character 0 in O31.10X0 mean?

The final character 0 shows the continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester applies to a single gestation, or that the affected fetus cannot be identified.

What MS-DRG does O31.10X0 group to?

When continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified 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 O31.10X0 be reported for?

The Medicare Code Editor checks continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified 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 O31.10X0?

Under the General Equivalence Mappings, continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified converts to ICD-9-CM 651.30 (twins w fetal loss-unsp) and 651.60 (mult ges w fet loss-unsp). 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.