O66.3 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 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

15: Pregnancy, childbirth and the puerperium (O00-O9A)

Section

O60-O77: Complications of labor and delivery (O60-O77)

Category O66

12 codes (10 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O66.3:

• Hydrops › causing obstructed labor (mother)
• Dystocia › fetal › abnormality NEC
• Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent) › causing disproportion › with obstructed labor
• Deformity › fetal › causing obstructed labor
• Dystocia › fetal › conjoined twins
• Delivery (childbirth) (labor) › complicated › by › fetal › deformity
• Delivery (childbirth) (labor) › complicated › by › obstructed labor › due to › dystocia (fetal) › due to › conjoined twins
• Delivery (childbirth) (labor) › complicated › by › obstructed labor › due to › dystocia (fetal) › due to › hydrocephalic fetus

Inclusion Terms

• 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

U.S. Hospital Utilization

• An estimated 700 U.S. inpatient stays in 2023 included O66.3 among the documented diagnoses.
• 135 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)