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ICD-10-CM Code O66.1
Obstructed labor due to locked twins

BILLABLE
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Female Only
Female Only
Code is only used for female patients.
Maternity Only
Maternity Only
Code is only used for diagnoses related to pregnancy.
| ICD-10 from 2011 - 2016

O66.1 is a billable ICD code used to specify a diagnosis of obstructed labor due to locked twins. A 'billable code' is detailed enough to be used to specify a medical diagnosis.


The ICD code O661 is used to code Locked twins

locked twins is a rare complication of multiple pregnancy where two fetuses become interlocked during presentation before birth. it occurs in roughly 1 in 1,000 twin deliveries and 1 in 90,000 deliveries overall. most often, locked twins are delivered via caesarean section, given that the condition has been diagnosed early enough. the fetal mortality rate is high for the twin that presents first, with over 50% being stillborn.

Specialty: Obstetrics
ICD 9 Code: 660.5
Source: Wikipedia

MS-DRG Mapping

  • DRG Group #767-768 - Vaginal delivery with sterilization and or d&c.
  • DRG Group #767-768 - Vaginal delivery with operating room procedure except steril and or d&c.
  • DRG Group #774 - Vaginal delivery with complicating diagnoses.
  • DRG Group #775 - Vaginal delivery without complicating diagnoses.

ICD-10-CM Alphabetical Index References for 'O66.1 - Obstructed labor due to locked twins'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code O66.1. Click on any term below to browse the alphabetical index.

Locked twins causing obstructed labor (O66.1)

Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)

Locked twins, delivered, with or without mention of antepartum condition (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code O66.1 and a single ICD9 code, 660.51 is an approximate match for comparison and conversion purposes.


Parent Code: O66 - Other obstructed labor

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/O661