2027 ICD-10-CM Diagnosis Code O09.12Supervision of pregnancy with history of ectopic pregnancy, second trimester

ICD-10-CM Codes›O00-O9A›O09›O09

ICD-10-CM O09.12
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O09.12 is a billable ICD-10-CM diagnosis code for supervision of pregnancy with history of ectopic pregnancy, second trimester. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 998. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64), not accepted as a principal diagnosis, and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Supervision of high-risk pregnancy.

Code Identity

ICD-10-CM Code
O09.12
Billable Status
Yes — Valid for Submission
Code Describes
Supervision of pregnancy with history of ectopic pregnancy, second trimester
Short Description
Suprvsn of preg with history of ectopic preg, second tri
Parent Code
O09.1
Supervision of pregnancy with history of ectopic pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO09Supervision of high risk pregnancy
CategoryO09Supervision of high risk pregnancy
This CodeO09.12Supervision of pregnancy with history of ectopic pregnancy, second trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O09.12.

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).
Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

O09.12 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Supervision of high risk pregnancy (O09).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O09.12: its own notes plus those printed at 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.

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O09.12, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming O09.12: they are not reported together with it, unless the two conditions are unrelated.

  • Z34 Encounter for supervision of normal pregnancy
    encounter for supervision of high risk pregnancy (O09.-) names O09.-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG008
Supervision of high-risk pregnancy
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Ectopic Pregnancy

The uterus, or womb, is the place where a fetus grows during pregnancy. In an ectopic pregnancy, the fertilized egg grows in the wrong place outside the uterus. It usually occurs in the fallopian tubes. These tubes carry eggs from the ovaries to the uterus.

The full article covers:

  • What is an ectopic pregnancy?
  • What increases my risk of an ectopic pregnancy?
  • What are the symptoms of an ectopic pregnancy?
  • How is an ectopic pregnancy diagnosed?
  • What is the treatment for an ectopic pregnancy?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert O09.12 to ICD-9-CMHistory

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

ICD-9-CM
V23.1 Preg w hx-trophoblas dis
Approximate The match is approximate rather than exact.
ICD-9-CM
V23.42 Preg w hx ectopic preg
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 O09.12Overview

Is O09.12 (Supervision of pregnancy with history of ectopic pregnancy) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report supervision of pregnancy with history of ectopic pregnancy, second trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O09.12 group to?

On inpatient claims, supervision of pregnancy with history of ectopic pregnancy, second trimester maps to MS-DRG 998 (principal Diagnosis Invalid as Discharge Diagnosis), which carries a relative weight of 0. Higher weights mean higher Medicare reimbursement.

Can O09.12 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because supervision of pregnancy with history of ectopic pregnancy, second trimester describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Who can O09.12 be reported for?

The Medicare Code Editor checks supervision of pregnancy with history of ectopic pregnancy, second trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Is O09.12 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for supervision of pregnancy with history of ectopic pregnancy, second trimester on inpatient claims. The code appears in the Supervision of high risk pregnancy (O09) range of the CMS exempt list.