ICD-10 Diagnosis Code Q89.4

Conjoined twins

Diagnosis Code Q89.4

ICD-10: Q89.4
Short Description: Conjoined twins
Long Description: Conjoined twins
This is the 2019 version of the ICD-10-CM diagnosis code Q89.4

Valid for Submission
The code Q89.4 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • Other congenital malformations (Q80-Q89)
      • Other congenital malformations, not elsewhere classified (Q89)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code Q89.4 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

Present on Admission (POA) Additional informationCallout TooltipPresent on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

The code Q89.4 is exempt from POA reporting.

  • Anadidymus
  • Anakatadidymus
  • Asymmetrical conjoined twins
  • Cephalodymus
  • Cephalothoracopagus
  • Conjoined twins
  • Cranial duplication
  • Craniopagus
  • Craniopagus frontalis
  • Craniopagus occipitalis
  • Craniopagus parasiticus
  • Craniopagus parietalis
  • Deradelphus
  • Derodidymis
  • Desmiognathus
  • Dicephalic parapagus
  • Dicephalus dipus dibrachius
  • Dicephalus dipus tetrabrachius
  • Dicephalus dipus tribrachius
  • Dicephalus tripus tribrachius
  • Diprosopus
  • Diprosopus
  • Dipygus
  • Dithoracic parapagus
  • Epignathus
  • Fetus in fetu
  • Gastrothoracopagus
  • Gastrothoracopagus dipygus
  • Heterodymus
  • Ischiomelus
  • Ischiopagus
  • Janiceps
  • Katadidymus
  • Monocephalus
  • Omphalopagus
  • Opodidymus
  • Parapagus
  • Parasitic twin of asymmetrical conjoined twins
  • Parasitic twin of asymmetrical conjoined twins
  • Parasitic twin of asymmetrical conjoined twins
  • Parasitic twin of asymmetrical conjoined twins
  • Polysomia
  • Pygoamorphus
  • Pygodidymus
  • Pygopagus
  • Rachipagus
  • Symmetrical conjoined twins
  • Syncephalus
  • Synchephalus twins
  • Thoracodelphus
  • Thoracodidymus
  • Thoracodidymus
  • Thoracomelus
  • Thoracopagus
  • Thoracopagus epigastricus
  • Thoracopagus parasiticus
  • Thoracopagus with conjoined atria
  • Thoracopagus with conjoined atria and ventricles
  • Thoracopagus with separate hearts and common pericardial sac
  • Thoracopagus with separate hearts and pericardial sacs
  • Thoracoparacephalus
  • Xiphopagus

Index of Diseases and Injuries
References found for the code Q89.4 in the Index of Diseases and Injuries:

Information for Patients

Birth Defects

A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.

A birth defect may affect how the body looks, works or both. Some birth defects like cleft lip or neural tube defects are structural problems that can be easy to see. To find others, like heart defects, doctors use special tests. Birth defects can range from mild to severe. Causes can include

  • Genetics
  • Exposures to medicines or chemicals. For example, alcohol abuse can cause fetal alcohol syndrome.
  • Infections during pregnancy
  • Certain medicines. Before you get pregnant, talk to your health care provider about any medicines you take.
  • Not getting enough of certain nutrients. For example, not getting enough folic acid before and during pregnancy is a key factor in causing neural tube defects.

For most birth defects, the cause is unknown.

Health care providers can diagnose certain birth defects during pregnancy, with prenatal tests. That's why it important to get regular prenatal care. Other birth defects may not be found until after the baby is born. Sometimes the defect is obvious right away. Other times, the health care provider may not discover it until later in life.

Babies with birth defects often need special care and treatments. The treatments may include surgery, medicines, assistive devices, and therapies.

Centers for Disease Control and Prevention

  • Intersex (Medical Encyclopedia)

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