2026 ICD-10-CM Diagnosis Code O60.03Preterm labor without delivery, third trimester

ICD-10-CM Codes›O00-O9A›O60-O77›O60

ICD-10-CM O60.03
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O60.03 is a billable ICD-10-CM diagnosis code for preterm labor without delivery, third trimester. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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 Early or threatened labor.

Code Identity

ICD-10-CM Code
O60.03
Billable Status
Yes — Valid for Submission
Code Describes
Preterm labor without delivery, third trimester
Short Description
Preterm labor without delivery, third trimester
Same as the full description in the CMS dataset.
Parent Code
O60.0
Preterm labor without delivery

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO60-O77Complications of labor and delivery
CategoryO60Preterm labor
This CodeO60.03Preterm labor without delivery, third trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O60.03.

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).

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Pregnancy(single) (uterine)
      • complicated by (care of) (management affected by)
        • preterm labor
          • third trimester
            • without delivery
    • Pregnancy(single) (uterine)
      • complicated by (care of) (management affected by)
        • preterm labor
          • without delivery
            • third trimester

Clinical ClassificationClinical

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

CCSR PRG011
Early or threatened labor
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Preterm Labor

Preterm labor is labor that starts before 37 completed weeks of pregnancy. It can lead to premature birth. Premature babies may face serious health risks.

Read the full article at MedlinePlus

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

Convert O60.03 to ICD-9-CMHistory

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

ICD-9-CM
644.03 Thrt prem labor-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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O60.03Overview

Is O60.03 (Preterm labor without delivery) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report preterm labor without delivery, third trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O60.03 group to?

When preterm labor without delivery, third trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O60.03 be reported for?

The Medicare Code Editor checks preterm labor without delivery, third 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 O60.03?

Under the General Equivalence Mappings, preterm labor without delivery, third trimester converts to ICD-9-CM 644.03 (thrt prem labor-antepart). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.