O66.1 – Obstructed labor due to locked twins
ICD-10-CM 2027 diagnosis code · Complications of labor and delivery
ICD-10-CM code
O66.1
- Code
O66.1(claims format:O661)- Description
- Obstructed labor due to locked twins
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 15. Pregnancy, childbirth and the puerperium (O00-O9A)
- Block
- O60-O77 Complications of labor and delivery
- Parent codes
- O66
Index terms for O66.1
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in O66
- O66.0 – Obstructed labor due to shoulder dystociaBillable
- O66.2 – Obstructed labor due to unusually large fetusBillable
- O66.3 – Obstructed labor due to other abnormalities of fetusBillable
- O66.4 – Failed trial of laborHeader
- O66.5 – Attempted application of vacuum extractor and forcepsBillable
- O66.6 – Obstructed labor due to other multiple fetusesBillable
- O66.8 – Other specified obstructed laborBillable
- O66.9 – Obstructed labor, unspecifiedBillable
Frequently asked questions
What is ICD-10 code O66.1?
O66.1 is the ICD-10-CM code for obstructed labor due to locked twins, in the block O60-O77 (Complications of labor and delivery).
Is O66.1 a billable code?
Yes. O66.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does O66.1 belong to?
It belongs to category O66 – Other obstructed labor.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.