2027 ICD-10-CM Diagnosis Code O30.019Twin pregnancy, monochorionic/monoamniotic, unspecified trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O30

ICD-10-CM O30.019
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O30.019 is a billable ICD-10-CM diagnosis code for twin pregnancy, monochorionic/monoamniotic, unspecified 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). Coders also document this condition as monoamniotic twins. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Multiple gestation.

Code Identity

ICD-10-CM Code
O30.019
Billable Status
Yes — Valid for Submission
Code Describes
Twin pregnancy, monochorionic/monoamniotic, unspecified trimester
Short Description
Twin pregnancy, monochorionic/monoamniotic, unsp trimester
Parent Code
O30.01
Twin pregnancy, monochorionic/monoamniotic

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 CodeO30.019Twin pregnancy, monochorionic/monoamniotic, unspecified trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O30.019.

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.

  • Monoamniotic twins
  • Twin monochorionic monoamniotic placenta

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O30.019: its own notes plus those printed at O30.01, 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 O30.01 Twin pregnancy, monochorionic/monoamniotic applies to 4 codes
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

  • Monochorionic Monoamniotic Twin Pregnancy

    a pregnancy involving two fetuses that share both the chorion and amniotic sac. these twins are invariably identical.

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 O30.019 to ICD-9-CMHistory

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

ICD-9-CM
651.00 Twin pregnancy-unspec
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
V91.01 Twin gest-monochr/monoam
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 O30.019Overview

What is the ICD-10 code for twin pregnancy, monochorionic/monoamniotic, unspecified trimester?

The ICD-10-CM code for twin pregnancy, monochorionic/monoamniotic, unspecified trimester is O30.019 (sometimes written as O30019). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O30.019 (Twin pregnancy, monochorionic/monoamniotic) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report twin pregnancy, monochorionic/monoamniotic, unspecified trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O30.019 group to?

When twin pregnancy, monochorionic/monoamniotic, unspecified 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 O30.019 be reported for?

The Medicare Code Editor checks twin pregnancy, monochorionic/monoamniotic, unspecified trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Can O30.019 be reported with a code from O30.02?

Not as a rule. The Excludes1 note at O30.01, which applies to O30.019, lists "conjoined twins (O30.02-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).