2027 ICD-10-CM Diagnosis Code O31.8X90Other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified
O31.8X90 is a billable ICD-10-CM diagnosis code for other complications specific to multiple gestation, 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 2027 (October 1, 2026 through September 30, 2027) 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 complications specific to multiple gestation. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Multiple gestation.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O31.8X90.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Complications specific to multiple gestation
- Multiple gestation with one OR more fetal malpresentations
- Multiple pregnancy with malpresentation
- Triplet pregnancy
- Triplet pregnancy with antenatal problem
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O31.8X90: its own notes plus those printed at O31 and Chapter 15. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Notes
General instructions on how these codes are used.
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- 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, Multiple gestation, must also be assigned when assigning a code from category O31 that has a 7th character of 1 through 9.
- 0not applicable or unspecified this code
- 1fetus 1
- 2fetus 2
- 3fetus 3
- 4fetus 4
- 5fetus 5
- 9other fetus
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert O31.8X90 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replaced This code was replaced in the FY 2027 code set by:
- O31.40X0 - Cont preg aft vanishing twin syn 1 fts or more,unsp tri,unsp
Questions About O31.8X90Overview
Is O31.8X90 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character 0 in O31.8X90 mean?
The final character 0 shows the other complications specific to multiple gestation, unspecified trimester applies to a single gestation, or that the affected fetus cannot be identified.
What MS-DRG does O31.8X90 group to?
When other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 833, 832, 831, 819, 818, 817, with relative weights from 0.5000 to 1.7586 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can O31.8X90 be reported for?
The Medicare Code Editor checks other complications specific to multiple gestation, 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 O31.8X90?
Under the General Equivalence Mappings, other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified converts to ICD-9-CM 651.90 (multi gestat NOS-unspec). The mapping is approximate, so confirm the match fits the documentation.
