Q21.0 – Ventricular septal defect
ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system
ICD-10-CM code
Q21.0
- Code
Q21.0(claims format:Q210)- Description
- Ventricular 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
Notes for Q21.0
Applicable to:
- Roger's disease
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)
Index terms for Q21.0
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Gerbode defect
- Roger's disease
- Maladie de Roger
- Defect, defective, Gerbode
- Disease, diseased, Roger's
- Anomaly, anomalous, Gerbode
- Imperfect, septum, ventricular
- Patent, interventricular septum
- Defect, defective, bulbar septum
- Fusion, fused, ventricles, heart
- Deformity, heart, septum, ventricular
- Defect, defective, ventricular septal
- Defect, defective, septal, ventricular
- Anomaly, anomalous, ventricular, septa
- Imperfect, closure, septum, ventricular
- Defect, defective, interventricular septal
- Displacement, displaced, ventricular septum
- Closure, interventricular septum, defective
- Anomaly, anomalous, atrioventricular, septum
- Imperfect, closure, ostium, interventricular
- Imperfect, closure, septum, interventricular
- Anomaly, anomalous, heart, septum, ventricular
- Anomaly, anomalous, heart, septum, interventricular
- Imperfect, closure, interventricular ostium or septum
- Anomaly, anomalous, communication, left ventricle with right atrium
Related codes in Q21
Frequently asked questions
What is ICD-10 code Q21.0?
Q21.0 is the ICD-10-CM code for ventricular septal defect, in the block Q20-Q28 (Congenital malformations of the circulatory system).
Is Q21.0 a billable code?
Yes. Q21.0 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does Q21.0 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.