O66.1
✓ Billable
Obstructed labor due to locked twins
ICD-10-CM · FY2026 · Pregnancy, Childbirth and the Puerperium
Code
O66.1
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Pregnancy, Childbirth and the Puerperium
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code O66.1?
ICD-10-CM code O66.1 represents Obstructed labor due to locked twins. It is a billable diagnosis code in the Pregnancy, Childbirth and the Puerperium chapter, effective October 1, 2025 – September 30, 2026.
Is O66.1 billable?
Yes. O66.1 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is O66.1 in?
O66.1 belongs to the Pregnancy, Childbirth and the Puerperium chapter (O00–O9A) of ICD-10-CM.
Related codes in the O66 category
O66
Other obstructed labor
Non-billable
O66.0
Obstructed labor due to shoulder dystocia
Billable
O66.2
Obstructed labor due to unusually large fetus
Billable
O66.3
Obstructed labor due to other abnormalities of fetus
Billable
O66.4
Failed trial of labor
Non-billable
O66.5
Attempted application of vacuum extractor and forceps
Billable
O66.6
Obstructed labor due to other multiple fetuses
Billable
O66.8
Other specified obstructed labor
Billable
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