2027 ICD-10-CM Diagnosis Code O66.9Obstructed labor, unspecified
ICD-10-CM Codes›O00-O9A›O60-O77›O66
- Billable — Valid for Submission
- Not Chronic
O66.9 is a billable ICD-10-CM diagnosis code for obstructed labor, unspecified. 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. 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 Malposition, disproportion or other labor complications.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O66.9.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Fetal dystocia
- Intrapartum hemorrhage
- Intrapartum hemorrhage co-occurrent and due to obstructed labor with uterine rupture
- Maternal dystocia
- Obstructed labor
- Puerperal sepsis
- Rupture of gravid uterus
- Rupture of uterus
- Rupture of uterus due to obstetric procedure
- Rupture of uterus during labor
- Rupture of uterus following obstructed labor
- Sepsis following obstructed labor
- Sequelae of reproductive disorders
- Vesicovaginal fistula
- Vesicovaginal fistula with involvement of urinary continence mechanism due to and following obstructed labor
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O66.9: its own notes plus those printed at Chapter 15. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Dystocia NOS
- Fetal dystocia NOS
- Maternal dystocia NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- 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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- 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.
- 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 O66.9, its category, or a range that includes it.
Applicable To 1
These notes mention O66.9.
- P03.1 Newborn affected by other malpresentation, malposition and disproportion during labor and delivery
Excludes1 2
These codes carry an Excludes1 note naming O66.9: they are not reported together with it, unless the two conditions are unrelated.
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.
Clinical InformationClinical
Dystocia
slow or difficult obstetric labor or childbirth.
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 O66.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O66.9Overview
What is the ICD-10 code for obstructed labor, unspecified?
The ICD-10-CM code for obstructed labor, unspecified is O66.9 (sometimes written as O669). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is O66.9 (Other obstructed labor) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report obstructed labor, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O66.9 group to?
When obstructed labor, unspecified 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.
Who can O66.9 be reported for?
The Medicare Code Editor checks obstructed labor, unspecified 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 O66.9?
Under the General Equivalence Mappings, obstructed labor, unspecified converts to ICD-9-CM 660.91 (obstruct labor NOS-deliv). The mapping is approximate, so confirm the match fits the documentation.
