O66.1
BillableObstructed labor due to locked twins
Obstructed labor due to locked twins
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
Use Additional Code
Additional codes that should follow this code
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Related Codes(8)
O66.0Obstructed labor due to shoulder dystocia
O66.2Obstructed labor due to unusually large fetus
O66.3Obstructed labor due to other abnormalities of fetus
O66.4Failed trial of labor
O66.5Attempted application of vacuum extractor and forceps
O66.6Obstructed labor due to other multiple fetuses
O66.8Other specified obstructed labor
O66.9Obstructed labor, unspecified
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(19)
SNOMED CT
UMLS
Clinical Terms
- Locked twins
- Locked twins obstructing labor
- Obstructed labor due to interlocked twins
- Obstructed labor due to interlocked twins (disorder)
- Obstructed labour due to interlocked twins
- Interlocked twins
- Locked twins obstructing labour
Frequently Asked Questions
What is the ICD-10 code for obstructed labor due to locked twins?
The ICD-10-CM code for obstructed labor due to locked twins is O66.1. The full clinical description is "Obstructed labor due to locked twins". O66.1 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code O66.1 mean?
ICD-10-CM code O66.1 represents “Obstructed labor due to locked twins”. It is classified under Chapter 15: Pregnancy, Childbirth and the Puerperium and is a billable/specific code that can be used on a claim.
Is O66.1 a billable code?
Yes, O66.1 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is O66.1 in?
O66.1 is in Chapter 15: Pregnancy, Childbirth and the Puerperium (codes O00-O9A).
What codes cannot be used with O66.1?
O66.1 has Excludes1 notes indicating codes that cannot be used together with it, including: supervision of normal pregnancy (Z34.-).
Are additional codes required with O66.1?
Yes, when using O66.1, also report: code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known..
What SNOMED CT codes does O66.1 map to?
O66.1 maps to 2 SNOMED CT concepts: 69777007, 1268535008. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for O66.1?
O66.1 is linked to 1 UMLS Concept Unique Identifier: C1455730. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does O66.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like obstructed labor due to locked twins affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of O66.1?
O66.1 maps to the ICD-11 code: JB06.1 (Obstructed labour due to locked twins).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.