2026 ICD-10-CM Diagnosis Code O30.91Multiple gestation, unspecified, first trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O30

ICD-10-CM O30.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O30.91 is a billable ICD-10-CM diagnosis code for multiple gestation, unspecified, first 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 Multiple gestation.

Code Identity

ICD-10-CM Code
O30.91
Billable Status
Yes — Valid for Submission
Code Describes
Multiple gestation, unspecified, first trimester
Short Description
Multiple gestation, unspecified, first trimester
Same as the full description in the CMS dataset.
Parent Code
O30.9
Multiple gestation, unspecified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO30Multiple gestation
This CodeO30.91Multiple gestation, unspecified, first trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O30.91.

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

Clinical InformationClinical

  • Multiple Gestation

    a pregnancy involving twins or higher-order multiple fetuses (e.g., triplets, quadruplets).

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 O30.91 to ICD-9-CMHistory

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

ICD-9-CM
651.91 Mult gestation NOS-deliv
Approximate The match is approximate rather than exact.
ICD-9-CM
651.93 Multi gest NOS-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 O30.91Overview

Is O30.91 (Multiple gestation, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report multiple gestation, unspecified, first trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O30.91 group to?

When multiple gestation, unspecified, first 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 O30.91 be reported for?

The Medicare Code Editor checks multiple gestation, unspecified, first 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 O30.91?

Under the General Equivalence Mappings, multiple gestation, unspecified, first trimester converts to ICD-9-CM 651.91 (mult gestation NOS-deliv) and 651.93 (multi gest NOS-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.