2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 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). 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).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O30.91: its own notes plus those printed at O30 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.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From O30 Multiple gestation applies to 88 codes
  • any complications specific to multiple gestation

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O30.91Overview

What is the ICD-10 code for multiple gestation, unspecified, first trimester?

The ICD-10-CM code for multiple gestation, unspecified, first trimester is O30.91 (sometimes written as O3091). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 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 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.