2026 ICD-10-CM Diagnosis Code O66.8Other specified obstructed labor

ICD-10-CM Codes›O00-O9A›O60-O77›O66

ICD-10-CM O66.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O66.8 is a billable ICD-10-CM diagnosis code for other specified obstructed labor. 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 postpartum hemorrhage. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malposition, disproportion or other labor complications.

Code Identity

ICD-10-CM Code
O66.8
Billable Status
Yes — Valid for Submission
Code Describes
Other specified obstructed labor
Short Description
Other specified obstructed labor
Same as the full description in the CMS dataset.
Parent Code
O66
Other obstructed labor

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO60-O77Complications of labor and delivery
CategoryO66Other obstructed labor
This CodeO66.8Other specified obstructed labor

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O66.8.

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.

  • Postpartum hemorrhage
  • Postpartum hemorrhage co-occurrent and due to uterine rupture following obstructed labor
  • Rupture of gravid uterus
  • Rupture of uterus
  • Rupture of uterus during labor

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

  • code to identify cause of obstruction

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.

    • Delivery(childbirth) (labor)
      • complicated
        • by
          • dilatation
            • bladder
    • Delivery(childbirth) (labor)
      • complicated
        • by
          • obstructed labor
            • specified NEC

Clinical ClassificationClinical

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

CCSR PRG024
Malposition, disproportion or other labor complications
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Postpartum Hemorrhage

    excess blood loss from uterine bleeding associated with obstetric labor or childbirth. it is defined as blood loss greater than 500 ml or of the amount that adversely affects the maternal physiology, such as blood pressure and hematocrit. postpartum hemorrhage is divided into two categories, immediate (within first 24 hours after birth) or delayed (after 24 hours postpartum).

  • Early Postpartum Hemorrhage|Primary Postpartum Hemorrhage|Primary Postpartum Hemorrhage

    cumulative blood loss of greater than or equal to 1000 ml or blood loss accompanied by signs or symptoms of hypovolemia within 24 hours following the birth process (includes intrapartum loss). (revitalize)

  • GAIA Level 1 Postpartum Hemorrhage|Global Alignment of Immunization safety Assessment in pregnancy Level 1 Postpartum Hemorrhage|Level 1 Postpartum Haemorrhage

    gaia level 1 postpartum hemorrhage is the presence of genital bleeding after delivery, leading to severe maternal outcome (maternal death or maternal near miss) as defined by who.

  • GAIA Level 2 Postpartum Hemorrhage|Global Alignment of Immunization safety Assessment in pregnancy Level 2 Postpartum Hemorrhage|Level 2 Postpartum Haemorrhage

    gaia level 2 postpartum hemorrhage is defined by the presence of the following criteria: genital bleeding after delivery with at least one of the following: a) measured abnormal bleeding (1000ml or more); or b) any bleeding leading to hypotension or blood transfusion.

  • GAIA Level 3 Postpartum Hemorrhage|Global Alignment of Immunization safety Assessment in pregnancy Level 3 Postpartum Hemorrhage|Level 3 Postpartum Haemorrhage

    gaia level 3 postpartum hemorrhage is defined by the presence of genital bleeding after delivery that is estimated at 1000ml or more.

  • GAIA Postpartum Hemorrhage Level of Diagnostic Certainty Terminology|Global Alignment of Immunization safety Assessment in pregnancy Postpartum Hemorrhage Level of Diagnostic Certainty Terminology

    a subset of terminology related to postpartum hemorrhage, developed by the global alignment of immunization safety assessment in pregnancy consortium to aid in monitoring and improving fetal and maternal outcomes.

  • GAIA Postpartum Hemorrhage Level of Diagnostic Certainty|Global Alignment of Immunization safety Assessment in pregnancy Postpartum Hemorrhage Level of Diagnostic Certainty|Postpartum Hemorrhage Level of Diagnostic Certainty

    a classification of maternal and fetal outcomes relating to postpartum hemorrhage, developed by the global alignment of immunization safety assessment in pregnancy, based on the extent to which the diagnosis has been confirmed.

  • Late Postpartum Hemorrhage|Delayed Postpartum Hemorrhage|Delayed Postpartum Hemorrhage|Secondary Postpartum Hemorrhage|Secondary Postpartum Hemorrhage

    excessive blood loss between 24 hours after delivery through four weeks that requires intervention.

  • Postpartum Hemorrhage

    hemorrhage defined as a blood loss in excess of 500 ml after vaginal delivery or more than 1000 ml after a cesarean delivery.

Patient EducationClinical

Childbirth Problems

Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:

Read the full article at MedlinePlus

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

Convert O66.8 to ICD-9-CMHistory

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

ICD-9-CM
660.81 Obstruct labor NEC-deliv
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 O66.8Overview

Is O66.8 (Other obstructed labor) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified obstructed labor on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O66.8 group to?

When other specified obstructed labor 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 O66.8 be reported for?

The Medicare Code Editor checks other specified obstructed labor 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 O66.8?

Under the General Equivalence Mappings, other specified obstructed labor converts to ICD-9-CM 660.81 (obstruct labor NEC-deliv). 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.