2027 ICD-10-CM Diagnosis Code O66.3Obstructed labor due to other abnormalities of fetus
ICD-10-CM Codes›O00-O9A›O60-O77›O66
- Billable — Valid for Submission
- Not Chronic
O66.3 is a billable ICD-10-CM diagnosis code for obstructed labor due to other abnormalities of fetus. 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). Coders also document this condition as obstructed labor due to fetal abnormality. 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 O66.3.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Obstructed labor due to fetal abnormality
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O66.3: 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 due to fetal ascites
- Dystocia due to fetal hydrops
- Dystocia due to fetal meningomyelocele
- Dystocia due to fetal sacral teratoma
- Dystocia due to fetal tumor
- Dystocia due to hydrocephalic fetus
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 to identify cause of obstruction
- 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 O66.3, its category, or a range that includes it.
Applicable To 1
These notes mention O66.3.
- P03.1 Newborn affected by other malpresentation, malposition and disproportion during labor and delivery
Excludes1 3
These codes carry an Excludes1 note naming O66.3: 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.
deformity O66.3
conjoined twins O66.3
abnormality NEC O66.3
ascites O66.3
hydrops O66.3
meningomyelocele O66.3
sacral teratoma O66.3
tumor O66.3
hydrocephalic fetus O66.3
abnormality NEC O66.3
conjoined twins O66.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 O66.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O66.3Overview
What is the ICD-10 code for obstructed labor due to other abnormalities of fetus?
The ICD-10-CM code for obstructed labor due to other abnormalities of fetus is O66.3 (sometimes written as O663). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is O66.3 (Other obstructed labor) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report obstructed labor due to other abnormalities of fetus on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O66.3 group to?
When obstructed labor due to other abnormalities of fetus 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 O66.3 be reported for?
The Medicare Code Editor checks obstructed labor due to other abnormalities of fetus against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
Does O66.3 need an additional code?
When the condition applies, yes. The Use Additional Code note reads: code to identify cause of obstruction. The additional code is reported after O66.3.
