2027 ICD-10-CM Diagnosis Code O30.821Other specified multiple gestation with two or more monoamniotic fetuses, first trimester
ICD-10-CM Codes›O00-O9A›O30-O48›O30
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
O30.821 is a billable ICD-10-CM diagnosis code for other specified multiple gestation with two or more monoamniotic fetuses, 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 206 closely related codes. 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
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O30.821.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O30.821: 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.
- 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.
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
- any complications specific to multiple gestation
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
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 O30.821 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O30.821Overview
Is O30.821 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified multiple gestation with two or more monoamniotic fetuses, first trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O30.821 group to?
When other specified multiple gestation with two or more monoamniotic fetuses, 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.
Is O30.821 a CC or MCC?
CMS lists O30.821 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 206 closely related codes in its exclusion list.
Who can O30.821 be reported for?
The Medicare Code Editor checks other specified multiple gestation with two or more monoamniotic fetuses, 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 O30.821?
Under the General Equivalence Mappings, other specified multiple gestation with two or more monoamniotic fetuses, first trimester converts to ICD-9-CM 651.81 (multi gestat NEC-deliver), 651.83 (multi gest NEC-antepart), and V91.92 (mult gest 2+ monoamn NEC). The mapping is approximate, so confirm the match fits the documentation.
