Other obstructed labor (O66) ICD-10-CM
The O66 code range covers other obstructed labor with 12 ICD-10-CM diagnosis codes. 10 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the O66 Range 12 codes · 10 billable
- O66 Other obstructed laborNon-billable
- O66.0 Obstructed labor due to shoulder dystocia
- O66.1 Obstructed labor due to locked twins
- O66.2 Obstructed labor due to unusually large fetus
- O66.3 Obstructed labor due to other abnormalities of fetus
- O66.4 Failed trial of laborNon-billable
- O66.40 Failed trial of labor, unspecified
- O66.41 Failed attempted vaginal birth after previous cesarean delivery
- O66.5 Attempted application of vacuum extractor and forceps
- O66.6 Obstructed labor due to other multiple fetuses
- O66.8 Other specified obstructed labor
- O66.9 Obstructed labor, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O66 range.
Postpartum Hemorrhage
Excess blood loss from uterine bleeding associated with OBSTETRIC LABOR or CHILDBIRTH. It is defined as blood loss greater than 500 ml or of the amount that adversely affects the maternal physiology, such as BLOOD PRESSURE and HEMATOCRIT. Postpartum hemorrhage is divided into two categories, immediate (within first 24 hours after birth) or delayed (after 24 hours postpartum).
Vesicovaginal Fistula
An abnormal anatomical passage between the URINARY BLADDER and the VAGINA.
About the O66 Code Range
The ICD-10 codes in the O66 category cover various types of other obstructed labor complications, describing specific causes and scenarios where labor is unusually difficult or unsuccessful. These codes help capture the detailed reasons for obstructions during childbirth beyond the most common causes.
The ICD-10 code for obstructed labor includes conditions such as shoulder dystocia (O66.0), where the baby's shoulder is stuck during delivery; locked twins (O66.1), where twins become interlocked; or labor complicated by a notably large fetus (O66.2). Codes also cover obstructions caused by other fetal abnormalities (O66.3) and situations like a failed trial of labor (O66.4), including unsuccessful attempts at vaginal birth after cesarean (O66.41). Interventions such as attempted vacuum or forceps delivery (O66.5) are coded to specify assisted delivery attempts. Other codes address obstructions related to multiple fetuses (O66.6) and various other specified or unspecified causes of obstructed labor (O66.8, O66.9) often linked with uterine rupture or postpartum complications. Using these codes accurately ensures precise documentation of complex labor issues for clinical and billing purposes.
Questions About This Page
How many billable codes are in the O66 range?
Of the 12 codes in this range, 10 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O66 range classify?
The range classifies other obstructed labor. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
