2023 ICD-10-CM Diagnosis Code Q21.4

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Aortopulmonary septal defect

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
  • Q21.4 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 Q21.4 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of Q21.4 - other international versions of ICD-10 Q21.4 may differ.
Applicable To
  • Aortic septal defect
  • Aortopulmonary window
The following code(s) above Q21.4 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 Q21.4:
  • 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
  • Q21
    ICD-10-CM Diagnosis Code Q21

    Congenital malformations of cardiac septa

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • acquired cardiac septal defect (I51.0)
    Congenital malformations of cardiac septa
Approximate Synonyms
  • Aortopulmonary septal defect (heart condition)
  • Aortopulmonary window
Clinical Information
  • A developmental abnormality in which the spiral (aortopulmonary) septum failed to completely divide the truncus arteriosus into ascending aorta and pulmonary artery. This abnormal communication between the two major vessels usually lies above their respective valves (aortic valve; pulmonary valve).
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.
  • Q21.4 is considered exempt from POA reporting.
ICD-10-CM Q21.4 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 306 Cardiac congenital and valvular disorders with mcc
  • 307 Cardiac congenital and valvular disorders without mcc

Convert Q21.4 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
Code annotations containing back-references to Q21.4:
  • Type 1 Excludes: Q20.0
    ICD-10-CM Diagnosis Code Q20.0

    Common arterial trunk

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
    Applicable To
    • Persistent truncus arteriosus
    Type 1 Excludes
    • aortic septal defect (Q21.4)

Diagnosis Index entries containing back-references to Q21.4:

ICD-10-CM Codes Adjacent To Q21.4
Q21.14 Superior sinus venosus atrial septal defect
Q21.15 Inferior sinus venosus atrial septal defect
Q21.16 Sinus venosus atrial septal defect, unspecified
Q21.19 Other specified atrial septal defect
Q21.2 Atrioventricular septal defect
Q21.20 …… unspecified as to partial or complete
Q21.21 Partial atrioventricular septal defect
Q21.22 Transitional atrioventricular septal defect
Q21.23 Complete atrioventricular septal defect
Q21.3 Tetralogy of Fallot
Q21.4 Aortopulmonary septal defect
Q21.8 Other congenital malformations of cardiac septa
Q21.9 Congenital malformation of cardiac septum, unspecified
Q22 Congenital malformations of pulmonary and tricuspid valves
Q22.0 Pulmonary valve atresia
Q22.1 Congenital pulmonary valve stenosis
Q22.2 Congenital pulmonary valve insufficiency
Q22.3 Other congenital malformations of pulmonary valve
Q22.4 Congenital tricuspid stenosis
Q22.5 Ebstein's anomaly
Q22.6 Hypoplastic right heart syndrome

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