2023 ICD-10-CM Diagnosis Code Q89.4

Conjoined twins

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
  • Q89.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM Q89.4 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of Q89.4 - other international versions of ICD-10 Q89.4 may differ.
Applicable To
  • Craniopagus
  • Dicephaly
  • Pygopagus
  • Thoracopagus
The following code(s) above Q89.4 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to Q89.4:
  • Q00-Q99
    2023 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    • Codes from this chapter are not for use on maternal records
    Type 2 Excludes
    • inborn errors of metabolism (E70-E88)
    Congenital malformations, deformations and chromosomal abnormalities
Clinical Information
  • A rare phenomenon in which the bodies of two identical twins are joined in the uterus. Approximately half of the cases are stillborn.
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Q89.4 is considered exempt from POA reporting.
ICD-10-CM Q89.4 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 393 Other digestive system diagnoses with mcc
  • 394 Other digestive system diagnoses with cc
  • 395 Other digestive system diagnoses without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert Q89.4 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change

Diagnosis Index entries containing back-references to Q89.4:
  • Conjoined twins Q89.4
  • Craniopagus Q89.4
  • Dicephalus, dicephaly Q89.4
  • Double
    • monster Q89.4
  • Epignathus Q89.4
  • Fusion, fused (congenital)
    • twins Q89.4
  • Ischiopagus Q89.4
  • Janiceps Q89.4
  • Monster, monstrosity (single) Q89.7
    ICD-10-CM Diagnosis Code Q89.7

    Multiple congenital malformations, not elsewhere classified

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
    Applicable To
    • Multiple congenital anomalies NOS
    • Multiple congenital deformities NOS
    Type 1 Excludes
    • congenital malformation syndromes affecting multiple systems (Q87.-)
    • twin Q89.4
  • Parasitic - see also condition
    • twin Q89.4
  • Pygopagus Q89.4
  • Rudimentary (congenital) - see also Agenesis
    • respiratory organs in thoracopagus Q89.4
  • Siamese twin Q89.4
  • Sternopagus Q89.4
  • Syncephalus Q89.4
  • Thoracopagus Q89.4
  • Twin (newborn) - see also Newborn, twin
    • conjoined Q89.4
  • Xiphopagus Q89.4

ICD-10-CM Codes Adjacent To Q89.4
Q87.81 Alport syndrome
Q87.82 Arterial tortuosity syndrome
Q87.89 Other specified congenital malformation syndromes, not elsewhere classified
Q89 Other congenital malformations, not elsewhere classified
Q89.0 Congenital absence and malformations of spleen
Q89.01 Asplenia (congenital)
Q89.09 Congenital malformations of spleen
Q89.1 Congenital malformations of adrenal gland
Q89.2 Congenital malformations of other endocrine glands
Q89.3 Situs inversus
Q89.4 Conjoined twins
Q89.7 Multiple congenital malformations, not elsewhere classified
Q89.8 Other specified congenital malformations
Q89.9 Congenital malformation, unspecified
Q90 Down syndrome
Q90.0 Trisomy 21, nonmosaicism (meiotic nondisjunction)
Q90.1 Trisomy 21, mosaicism (mitotic nondisjunction)
Q90.2 Trisomy 21, translocation
Q90.9 Down syndrome, unspecified
Q91 Trisomy 18 and Trisomy 13
Q91.0 Trisomy 18, nonmosaicism (meiotic nondisjunction)

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.