O66.9 Obstructed labor, unspecified

The ICD-10-CM code for Obstructed labor, unspecified is O66.9 (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 O66.9:

• Dystocia
• Dystocia › maternal
• Dystocia › fetal
• Delay, delayed › any plane in pelvis › complicating delivery
• Delivery (childbirth) (labor) › complicated › by › obstructed labor › due to › dystocia (fetal)

Inclusion Terms

• Dystocia NOS
• Fetal dystocia NOS
• Maternal dystocia NOS

U.S. Hospital Utilization

• An estimated 1,075 U.S. inpatient stays in 2023 included O66.9 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)