2026 ICD-10-CM Diagnosis Code O47.00False labor before 37 completed weeks of gestation, unspecified trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O47

ICD-10-CM O47.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O47.00 is a billable ICD-10-CM diagnosis code for false labor before 37 completed weeks of gestation, unspecified 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). Coders also document this condition as false labor. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Early or threatened labor.

Code Identity

ICD-10-CM Code
O47.00
Billable Status
Yes — Valid for Submission
Code Describes
False labor before 37 completed weeks of gestation, unspecified trimester
Short Description
False labor before 37 completed weeks of gest, unsp tri
Parent Code
O47.0
False labor before 37 completed weeks of gestation

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO47False labor
This CodeO47.00False labor before 37 completed weeks of gestation, unspecified trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O47.00.

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.

  • False labor
  • False labor before 37 completed weeks of gestation

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

Childbirth

Childbirth is the process of giving birth to a baby. It includes labor and delivery of the fetus and the placenta. The placenta is the organ that supplies food and oxygen through the umbilical cord to your fetus during pregnancy.

The full article covers:

  • What is childbirth?
  • How do I know if I'm going into labor?
  • What are the stages of labor?
  • What are the options for pain relief during childbirth?

Read the full article at MedlinePlus

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

Convert O47.00 to ICD-9-CMHistory

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

ICD-9-CM
644.10 Threat labor NEC-unspec
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 O47.00Overview

Is O47.00 (False labor before 37 completed weeks of gestation) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report false labor before 37 completed weeks of gestation, unspecified trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O47.00 group to?

When false labor before 37 completed weeks of gestation, unspecified 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 O47.00 be reported for?

The Medicare Code Editor checks false labor before 37 completed weeks of gestation, unspecified 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 O47.00?

Under the General Equivalence Mappings, false labor before 37 completed weeks of gestation, unspecified trimester converts to ICD-9-CM 644.10 (threat labor NEC-unspec). 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.