Q21.1 ICD-10-CM Code: Atrial septal defect
Q21.1 isn’t billable on its own. Choose one of the 8 billable codes beneath it, the one the documentation supports.
Official description
Q21.1Atrial septal defect
ICD-10-CM diagnosis code · United States clinical modification
Billable codes under Q21.1
Q21.1 can’t be reported on its own. Choose the code below that matches what the note documents.
Q21.10Atrial septal defect, unspecifiedQ21.11Secundum atrial septal defectQ21.12Patent foramen ovaleQ21.13Coronary sinus atrial septal defectQ21.14Superior sinus venosus atrial septal defectQ21.15Inferior sinus venosus atrial septal defectQ21.16Sinus venosus atrial septal defect, unspecifiedQ21.19Other specified atrial septal defectWhere Q21.1 sits
- 1
Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- 2
Section
Congenital malformations of the circulatory system (Q20-Q28)
- 3
Category Q21
Congenital malformations of cardiac septa
- 4
Code Q21.1
Atrial septal defect
Notes for this code
Inclusion terms
No inclusion terms are listed for Q21.1.
Code first
No “code first” instruction is listed for Q21.1.
Use additional code
No “use additional code” instruction is listed for Q21.1.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for Q21.1.
Excludes2
Conditions not included here that may be reported separately when present.
- ostium primum atrial septal defect (type I) (Q21.20)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code Q21.1 mean?
Q21.1 is the FY 2027 U.S. ICD-10-CM code for “Atrial septal defect.”
Is Q21.1 a billable or specific ICD-10-CM code?
No. Q21.1 has 8 billable codes beneath it in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Q21.1 located in ICD-10-CM?
Q21.1 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Congenital malformations of the circulatory system (Q20-Q28) (Q20–Q28), under category Q21, Congenital malformations of cardiac septa.
What coding notes are listed for Q21.1?
No inclusion terms are listed for Q21.1 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: ostium primum atrial septal defect (type I) (Q21.20).