ICD-10-CM Codes
Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities
Q20-Q28 Congenital malformations of the circulatory system
Q21- Congenital malformations of cardiac septa
2021 ICD-10-CM Diagnosis Code Q21.1

2021 ICD-10-CM Diagnosis Code Q21.1

Atrial septal defect

2016

2017

2018

2019

2020

2021

Billable/Specific Code

POA Exempt

Q21.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2021 edition of ICD-10-CM Q21.1 became effective on October 1, 2020.
This is the American ICD-10-CM version of Q21.1 - other international versions of ICD-10 Q21.1 may differ.

Applicable To

Coronary sinus defect
Patent or persistent foramen ovale
Patent or persistent ostium secundum defect (type II)
Patent or persistent sinus venosus defect

The following code(s) above Q21.1 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 Q21.1:

Q00-Q99
2021 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
Type 1 Excludes
- acquired cardiac septal defect (I51.0)
Congenital malformations of cardiac septa

Approximate Synonyms

Atrial septal defect through coronary sinus orifice
Atrial septal defect, coronary sinus type
Atrial septal defect, ostium secundum type
Atrial septal defect, sinus venosus
Common atrium
Cor triloculare biventriculare
Ostium secundum type atrial septal defect
Patent foramen ovale
Sinus venosus atrial septal defect

Clinical Information

A condition in which the foramen ovale in the atrial septum fails to close shortly after birth. This results in abnormal communications between the two upper chambers of the heart. An isolated patent ovale foramen without other structural heart defects is usually of no hemodynamic significance.
Defect in the wall between the lower chambers of the heart
Developmental abnormalities in any portion of the atrial septum resulting in abnormal communications between the two upper chambers of the heart. Classification of atrial septal defects is based on location of the communication and types of incomplete fusion of atrial septa with the endocardial cushions in the fetal heart. They include ostium primum, ostium secundum, sinus venosus, and coronary sinus defects.
The presence of a defect (opening) in the septum that separates the two atria of the heart. The asd can be congenital or acquired.

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.

Q21.1 is considered exempt from POA reporting.

ICD-10-CM Q21.1 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):

306 Cardiac congenital and valvular disorders with mcc
307 Cardiac congenital and valvular disorders without mcc

Convert Q21.1 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

Code annotations containing back-references to Q21.1:

Code Also: I27.83

ICD-10-CM Diagnosis Code I27.83
Eisenmenger's syndrome
Applicable To
- Eisenmenger's complex
- (Irreversible) Eisenmenger's disease
- Pulmonary hypertension with right to left shunt related to congenital heart disease
Code Also
- underlying heart defect, if known, such as:
- atrial septal defect (Q21.1)
- Eisenmenger's defect (Q21.8)
- patent ductus arteriosus (Q25.0)
- ventricular septal defect (Q21.0)

Diagnosis Index entries containing back-references to Q21.1:

Abnormal, abnormality, abnormalities - see also Anomaly
- sinus venosus Q21.1
Absence (of) (organ or part) (complete or partial)
- septum
  - atrial Q21.1 (congenital)
- atrial septum Q21.1 (congenital)
Acleistocardia Q21.1
Agenesis
- septum
  - atrial Q21.1
Anomaly, anomalous (congenital) (unspecified type) Q89.9
ICD-10-CM Diagnosis Code Q89.9
Congenital malformation, unspecified
Applicable To
Congenital anomaly NOS
Congenital deformity NOS
- atrial
  - septa Q21.1
- foramen
  - Botalli Q21.1
  - ovale Q21.1
- heart Q24.9
  ICD-10-CM Diagnosis Code Q24.9
  Congenital malformation of heart, unspecified
  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  Applicable To
  Congenital anomaly of heart
  Congenital disease of heart
  - septum Q21.9
    ICD-10-CM Diagnosis Code Q21.9
    Congenital malformation of cardiac septum, unspecified
    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
    Applicable To
    Septal (heart) defect NOS
    - auricular Q21.1
    - interatrial Q21.1
Closure
- foramen ovale, imperfect Q21.1
- interauricular septum, defective Q21.1
Common
- atrium Q21.1
Cor
- triloculare Q20.8
  ICD-10-CM Diagnosis Code Q20.8
  Other congenital malformations of cardiac chambers and connections
  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  Applicable To
  Cor binoculare
  - biventriculare Q21.1
Cyanosis R23.0
ICD-10-CM Diagnosis Code R23.0
Cyanosis
Type 1 Excludes
acrocyanosis (I73.8)
cyanotic attacks of newborn (P28.2)
- due to
  - patent foramen botalli Q21.1
  - persistent foramen ovale Q21.1
Defect, defective Q89.9
ICD-10-CM Diagnosis Code Q89.9
Congenital malformation, unspecified
Applicable To
Congenital anomaly NOS
Congenital deformity NOS
- atrial septal (ostium secundum type) Q21.1
- ostium
  - secundum Q21.1
- septal (heart) Q21.9
  ICD-10-CM Diagnosis Code Q21.9
  Congenital malformation of cardiac septum, unspecified
  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  Applicable To
  Septal (heart) defect NOS
  - atrial Q21.1
- auricular septal Q21.1
- coronary sinus Q21.1
- interatrial septal Q21.1
- interauricular septal Q21.1
- sinus venosus Q21.1
Deformity Q89.9
ICD-10-CM Diagnosis Code Q89.9
Congenital malformation, unspecified
Applicable To
Congenital anomaly NOS
Congenital deformity NOS
- heart (congenital) Q24.9
  ICD-10-CM Diagnosis Code Q24.9
  Congenital malformation of heart, unspecified
  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  Applicable To
  Congenital anomaly of heart
  Congenital disease of heart
  - septum Q21.9
    ICD-10-CM Diagnosis Code Q21.9
    Congenital malformation of cardiac septum, unspecified
    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
    Applicable To
    Septal (heart) defect NOS
    - auricular Q21.1
- atrial septal Q21.1
Disease, diseased - see also Syndrome
- Lutembacher's Q21.1 (atrial septal defect with mitral stenosis)
Foramen ovale Q21.1 (nonclosure) (patent) (persistent)
Fusion, fused (congenital)
- atria Q21.1
- auricles, heart Q21.1
Imperfect
- closure (congenital)
  - foramen
    - botalli Q21.1
    - ovale Q21.1
  - ostium
    - interatrial Q21.1
    - interauricular Q21.1
  - septum
    - atrial Q21.1 (secundum)
    - interatrial Q21.1 (secundum)
    - interauricular Q21.1 (secundum)
  - atrium Q21.1 (secundum)
  - interatrial ostium or septum Q21.1
  - interauricular ostium or septum Q21.1
Lutembacher's disease or syndrome Q21.1 (atrial septal defect with mitral stenosis)
Nonclosure - see also Imperfect, closure
- foramen
  - botalli Q21.1
  - ovale Q21.1
Ostium
- secundum Q21.1 (arteriosum) (defect) (patent) (persistent)
Patent - see also Imperfect, closure
- foramen
  - botalli Q21.1
  - ovale Q21.1
- interauricular septum Q21.1
- ostium secundum Q21.1
Perforation, perforated (nontraumatic) (of)
- atrial septum, multiple Q21.1
Persistence, persistent (congenital)
- foramen
  - Botalli Q21.1
  - ovale Q21.1
- ostium
  - secundum Q21.1
Syndrome - see also Disease
- Lutembacher's Q21.1

ICD-10-CM Codes Adjacent To Q21.1

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

Q22.2 Congenital pulmonary valve insufficiency

Q22.3 Other congenital malformations of pulmonary valve

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

2021 ICD-10-CM Diagnosis Code Q21.1

Atrial septal defect

Congenital malformations, deformations and chromosomal abnormalities

Congenital malformations of cardiac septa

Eisenmenger's syndrome

Congenital malformation, unspecified

Congenital malformation of heart, unspecified

Congenital malformation of cardiac septum, unspecified

Other congenital malformations of cardiac chambers and connections

Cyanosis

Congenital malformation, unspecified

Congenital malformation of cardiac septum, unspecified

Congenital malformation, unspecified

Congenital malformation of heart, unspecified

Congenital malformation of cardiac septum, unspecified