Q21.19 – Other specified atrial septal defect
ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system
ICD-10-CM code
Q21.19
- Code
Q21.19(claims format:Q2119)- Description
- Other specified atrial septal defect
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- Block
- Q20-Q28 Congenital malformations of the circulatory system
- Parent codes
- Q21 › Q21.1
Notes for Q21.19
Applicable to:
- Common atrium
- Other specified atrial septal abnormality
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Q21 – Congenital malformations of cardiac septa
Excludes1 (not coded here):
- acquired cardiac septal defect (I51.0)
Q21.1 – Atrial septal defect
Excludes2 (not included here):
- ostium primum atrial septal defect (type I) (Q21.20)
Index terms for Q21.19
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Acleistocardia
- Common, atrium
- Fusion, fused, atria
- Absence, atrial septum
- Syndrome, Lutembacher's
- Absence, septum, atrial
- Agenesis, septum, atrial
- Patent, interauricular septum
- Fusion, fused, auricles, heart
- Cor, triloculare, biventriculare
- Disease, diseased, Lutembacher's
- Lutembacher's disease or syndrome
- Imperfect, closure, septum, atrial
- Defect, defective, interatrial septal
- Imperfect, closure, ostium, interatrial
- Imperfect, closure, septum, interatrial
- Defect, defective, interauricular septal
- Closure, interauricular septum, defective
- Imperfect, closure, ostium, interauricular
- Imperfect, closure, septum, interauricular
- Anomaly, anomalous, heart, septum, auricular
- Anomaly, anomalous, heart, septum, interatrial
- Defect, defective, atrial septal, specified NEC
- Imperfect, closure, interatrial ostium or septum
- Perforation, perforated, atrial septum, multiple
Related codes in Q21.1
- Q21.10 – Atrial septal defect, unspecifiedBillable
- Q21.11 – Secundum atrial septal defectBillable
- Q21.12 – Patent foramen ovaleBillable
- Q21.13 – Coronary sinus atrial septal defectBillable
- Q21.14 – Superior sinus venosus atrial septal defectBillable
- Q21.15 – Inferior sinus venosus atrial septal defectBillable
- Q21.16 – Sinus venosus atrial septal defect, unspecifiedBillable
Frequently asked questions
What is ICD-10 code Q21.19?
Q21.19 is the ICD-10-CM code for other specified atrial septal defect, in the block Q20-Q28 (Congenital malformations of the circulatory system).
Is Q21.19 a billable code?
Yes. Q21.19 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does Q21.19 belong to?
It belongs to category Q21 – Congenital malformations of cardiac septa.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.