2020 ICD-10-CM Diagnosis Code Q21

Congenital malformations of cardiac septa

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • Q21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM Q21 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of Q21 - other international versions of ICD-10 Q21 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as Q21. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • acquired cardiac septal defect (
    ICD-10-CM Diagnosis Code I51.0

    Cardiac septal defect, acquired

      2016 2017 2018 2019 2020 Billable/Specific Code Adult Dx (15-124 years)
    Applicable To
    • Acquired septal atrial defect (old)
    • Acquired septal auricular defect (old)
    • Acquired septal ventricular defect (old)
    Type 1 Excludes
    • cardiac septal defect as current complication following acute myocardial infarction (I23.1, I23.2)
    I51.0
    )
The following code(s) above Q21 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:
  • Q00-Q99
    2020 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    Note
    • 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 congenital disorder characterized by the presence of an abnormal communication between the atria or the ventricles of the heart due to defects in the cardiac septum.
  • Abnormalities in any part of the heart septum resulting in abnormal communication between the left and the right chambers of the heart. The abnormal blood flow inside the heart may be caused by defects in the atrial septum, the ventricular septum, or both.
  • Defects in the cardiac septa, resulting in abnormal communications between the opposite chambers of the heart that exist at, and usually before, birth regardless of their causation.
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
ICD-10-CM Codes Adjacent To Q21
Q20 Congenital malformations of cardiac chambers and connections
Q20.0 Common arterial trunk
Q20.1 Double outlet right ventricle
Q20.2 Double outlet left ventricle
Q20.3 Discordant ventriculoarterial connection
Q20.4 Double inlet ventricle
Q20.5 Discordant atrioventricular connection
Q20.6 Isomerism of atrial appendages
Q20.8 Other congenital malformations of cardiac chambers and connections
Q20.9 Congenital malformation of cardiac chambers and connections, unspecified
Q21 Congenital malformations of cardiac septa
Q21.0 Ventricular septal defect
Q21.1 Atrial septal defect
Q21.2 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

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