2027 ICD-10-CM Diagnosis Code O47.1False labor at or after 37 completed weeks of gestation

ICD-10-CM Codes›O00-O9A›O30-O48›O47

ICD-10-CM O47.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O47.1 is a billable ICD-10-CM diagnosis code for false labor at or after 37 completed weeks of gestation. 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 277 closely related codes. 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
O47.1
Billable Status
Yes — Valid for Submission
Code Describes
False labor at or after 37 completed weeks of gestation
Short Description
False labor at or after 37 completed weeks of gestation
Same as the full description in the CMS dataset.
Parent Code
O47
False labor

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 CodeO47.1False labor at or after 37 completed weeks of gestation

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O47.1.

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 at or after 37 completed weeks of gestation

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O47.1: its own notes plus those printed at O47 and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From O47 False labor applies to 5 codes
  • Braxton Hicks contractions
  • threatened labor

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From O47 False labor applies to 5 codes
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.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

Clinical InformationClinical

  • Threatened Term Labor

    frequent painful contractions beyond 37 weeks of gestation without advancing into labor or delivery.

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 O47.1 to ICD-9-CMHistory

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

ICD-9-CM
644.13 Threat labor NEC-antepar
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 O47.1Overview

What is the ICD-10 code for false labor at or after 37 completed weeks of gestation?

The ICD-10-CM code for false labor at or after 37 completed weeks of gestation is O47.1 (sometimes written as O471). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O47.1 (False labor) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report false labor at or after 37 completed weeks of gestation on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O47.1 group to?

When false labor at or after 37 completed weeks of gestation 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 O47.1 a CC or MCC?

CMS lists O47.1 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 277 closely related codes in its exclusion list.

Who can O47.1 be reported for?

The Medicare Code Editor checks false labor at or after 37 completed weeks of gestation against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.