2020 ICD-10-CM Diagnosis Code Q21.2

Atrioventricular septal defect

    2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
  • Q21.2 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM Q21.2 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of Q21.2 - other international versions of ICD-10 Q21.2 may differ.
Applicable To
  • Common atrioventricular canal
  • Endocardial cushion defect
  • Ostium primum atrial septal defect (type I)
The following code(s) above Q21.2 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 Q21.2:
  • 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
  • Q21
    ICD-10-CM Diagnosis Code Q21

    Congenital malformations of cardiac septa

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • acquired cardiac septal defect (I51.0)
    Congenital malformations of cardiac septa
Approximate Synonyms
  • Atrial septal defect, ostium primum type
  • Common atrioventricular canal
  • Endocardial cushion defect
  • Ostium primum defect
Clinical Information
  • A spectrum of septal defects involving the atrial septum; ventricular septum; and the atrioventricular valves (tricuspid valve; bicuspid valve). These defects are due to incomplete growth and fusion of the endocardial cushions which are important in the formation of two atrioventricular canals, site of future atrioventricular valves.
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.
  • Q21.2 is considered exempt from POA reporting.
ICD-10-CM Q21.2 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 306 Cardiac congenital and valvular disorders with mcc
  • 307 Cardiac congenital and valvular disorders without mcc

Convert Q21.2 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

Diagnosis Index entries containing back-references to Q21.2:
  • Canal - see also condition
    • atrioventricular common Q21.2
  • Common
    • atrioventricular canal Q21.2
  • Defect, defective Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
    • atrial septal (ostium secundum type) Q21.1
      ICD-10-CM Diagnosis Code Q21.1

      Atrial septal defect

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Coronary sinus defect
      • Patent or persistent foramen ovale
      • Patent or persistent ostium secundum defect (type II)
      • Patent or persistent sinus venosus defect
      • ostium primum type Q21.2
    • atrioventricular
      • canal Q21.2
      • septum Q21.2
    • ostium
      • primum Q21.2
    • cushion, endocardial Q21.2
  • Endocardium, endocardial - see also condition
    • cushion defect Q21.2
  • Imperfect
    • closure (congenital)
      • atrioventricular ostium Q21.2
  • Ostium
    • atrioventriculare commune Q21.2
    • primum Q21.2 (arteriosum) (defect) (persistent)
  • Persistence, persistent (congenital)
    • ostium
      • atrioventriculare commune Q21.2
      • primum Q21.2
    • atrioventricular canal Q21.2
  • Single
    • atrium Q21.2

ICD-10-CM Codes Adjacent To Q21.2
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
Q22.2 Congenital pulmonary valve insufficiency
Q22.3 Other congenital malformations of pulmonary valve
Q22.4 Congenital tricuspid stenosis

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