2026 ICD-10-CM Diagnosis Code O31Complications specific to multiple gestation

ICD-10-CM Codes›O00-O9A›O30-O48›O31

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

O31 is a non-billable ICD-10-CM category code for complications specific to multiple gestation, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O31.00X0, O31.00X1, O31.00X2, and O31.00X3.

Code Identity

ICD-10-CM Code
O31
Billable Status
No — Non-Billable Category
Code Describes
Complications specific to multiple gestation
Chapter
O30-O48
Maternal care related to the fetus and amniotic cavity and possible delivery problems

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 CodeO31Complications specific to multiple gestation

Specific Coding for Complications specific to multiple gestationOverview

Non-specific codes like O31 require more characters. Use one of these billable codes instead:

  • O31.0 for Papyraceous fetus

  • O31.00 for Papyraceous fetus, unspecified trimester

  • O31.01 for Papyraceous fetus, first trimester

  • O31.02 for Papyraceous fetus, second trimester

  • O31.03 for Papyraceous fetus, third trimester

  • O31.1 for Continuing pregnancy after spontaneous abortion of one fetus or more

  • O31.10 for Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester

  • O31.11 for Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester

  • O31.12 for Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester

  • O31.13 for Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester

  • O31.2 for Continuing pregnancy after intrauterine death of one fetus or more

  • O31.20 for Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester

  • O31.21 for Continuing pregnancy after intrauterine death of one fetus or more, first trimester

  • O31.22 for Continuing pregnancy after intrauterine death of one fetus or more, second trimester

  • O31.23 for Continuing pregnancy after intrauterine death of one fetus or more, third trimester

  • O31.3 for Continuing pregnancy after elective fetal reduction of one fetus or more

  • O31.30 for Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester

  • O31.31 for Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester

  • O31.32 for Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester

  • O31.33 for Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester

  • O31.8 for Other complications specific to multiple gestation

  • O31.8X for Other complications specific to multiple gestation

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 2 Excludes

  • delayed delivery of second twin, triplet, etc. O63.2
  • malpresentation of one fetus or more O32.9
  • placental transfusion syndromes O43.0

7th Character Note

  • One of the following 7th characters is to be assigned to each code under category O31. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30

7th Character

  • 0 - not applicable or unspecified
  • 1 - fetus 1
  • 2 - fetus 2
  • 3 - fetus 3
  • 4 - fetus 4
  • 5 - fetus 5
  • 9 - other fetus

Patient EducationClinical

Twins, Triplets, Multiple Births

If you are pregnant with more than one baby, you are far from alone. Multiple births are up in the United States. More women are having babies after age 30 and more are taking fertility drugs. Both boost the chance of carrying more than one baby. A family history of twins also makes multiples more likely.

Read the full article at MedlinePlus

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

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 O31Overview

Is O31 (Complications specific to multiple gestation) a billable code?

No. This is a category header that groups the codes for complications specific to multiple gestation, and headers cannot be submitted on claims. Claims for complications specific to multiple gestation need a more specific code from this category, such as O31.00X0, O31.00X1, and O31.00X2.