2027 ICD-10-CM Diagnosis Code O66Other obstructed labor

ICD-10-CM Codes›O00-O9A›O60-O77›O66

ICD-10-CM O66
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O66 is a non-billable ICD-10-CM category code for other obstructed labor, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O66.0, O66.1, O66.2, and O66.3.

Code Identity

ICD-10-CM Code
O66
Billable Status
No — Non-Billable Category
Code Describes
Other obstructed labor
Short Description
Other obstructed labor
Same as the full description in the CMS dataset.
Chapter
O60-O77
Complications of labor and delivery

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO60-O77Complications of labor and delivery
CategoryO66Other obstructed labor
This CodeO66Other obstructed labor

Specific Coding for Other obstructed laborOverview

Non-specific codes like O66 require more characters. Use one of these billable codes instead:

  • Use O66.0 for Obstructed labor due to shoulder dystocia

  • Use O66.1 for Obstructed labor due to locked twins

  • Use O66.2 for Obstructed labor due to unusually large fetus

  • Use O66.3 for Obstructed labor due to other abnormalities of fetus

  • O66.4 for Failed trial of labor

  • Use O66.40 for Failed trial of labor, unspecified

  • Use O66.41 for Failed attempted vaginal birth after previous cesarean delivery

  • Use O66.5 for Attempted application of vacuum extractor and forceps

  • Use O66.6 for Obstructed labor due to other multiple fetuses

  • Use O66.8 for Other specified obstructed labor

  • Use O66.9 for Obstructed labor, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O66: 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 O66, its category, or a range that includes it.

Applicable To 1

These notes mention O66.

  • P03.1 Newborn affected by other malpresentation, malposition and disproportion during labor and delivery
    Newborn affected by conditions classifiable to O64-O66 names O64-O66, which includes this code

Excludes1 1

These codes carry an Excludes1 note naming O66: they are not reported together with it, unless the two conditions are unrelated.

  • O33 Maternal care for disproportion
    disproportion with obstructed labor (O65-O66) names O65-O66, which includes this code

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.

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 O66Overview

What is the ICD-10 code for other obstructed labor?

O66 is the ICD-10-CM category for other obstructed labor, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is O66 (Other obstructed labor) a billable code?

No. This is a category header that groups the codes for other obstructed labor, and headers cannot be submitted on claims. Claims for other obstructed labor need a more specific code from this category, such as O66.0, O66.1, and O66.2.