2027 ICD-10-CM Diagnosis Code O09.93Supervision of high risk pregnancy, unspecified, third trimester

ICD-10-CM Codes›O00-O9A›O09›O09

ICD-10-CM O09.93
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O09.93 is a billable ICD-10-CM diagnosis code for supervision of high risk pregnancy, unspecified, third 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
O09.93
Billable Status
Yes — Valid for Submission
Code Describes
Supervision of high risk pregnancy, unspecified, third trimester
Short Description
Supervision of high risk pregnancy, unsp, third trimester
Parent Code
O09.9
Supervision of high risk pregnancy, unspecified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO09Supervision of high risk pregnancy
CategoryO09Supervision of high risk pregnancy
This CodeO09.93Supervision of high risk pregnancy, unspecified, third trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O09.93.

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

O09.93 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 O09.93: 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 O09.93, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming O09.93: 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

Health Problems in Pregnancy

A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.

The full article covers:

  • What are health problems in pregnancy?
  • What raises my risk for health problems during pregnancy?
  • Can chronic health conditions cause problems in pregnancy?
  • Can health problems in pregnancy be prevented?

Read the full article at MedlinePlus

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

Convert O09.93 to ICD-9-CMHistory

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

ICD-9-CM
V23.9 Suprv high-risk preg NOS
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 O09.93Overview

What is the ICD-10 code for supervision of high risk pregnancy, unspecified, third trimester?

The ICD-10-CM code for supervision of high risk pregnancy, unspecified, third trimester is O09.93 (sometimes written as O0993). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O09.93 (Supervision of high risk pregnancy, unspecified) a billable code?

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

What MS-DRG does O09.93 group to?

On inpatient claims, supervision of high risk pregnancy, unspecified, third 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 O09.93 be a principal diagnosis?

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

Who can O09.93 be reported for?

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