Q21.23 Complete atrioventricular septal defect
The ICD-10-CM code for Complete atrioventricular septal defect is Q21.23 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- Q20-Q28: Congenital malformations of the circulatory system (Q20-Q28)
- Category Q21
- 20 codes (17 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to Q21.23:
- Ostium › atrioventriculare commune
- Common › atrioventricular canal
- Persistence, persistent (congenital) › ostium › atrioventriculare commune
- Canal › atrioventricular › common
- Defect, defective › cushion, endocardial › common
- Defect, defective › atrioventricular › septal › common
- Defect, defective › atrioventricular › septal › complete
- Defect, defective › atrial septal › ostium primum type (type I) › with › common atrioventricular valves and moderate or larger inlet VSD
Inclusion Terms
- Common atrioventricular canal
- Common atrioventricular septal defect
- Common endocardial cushion defect
- Ostium primum atrial septal defect (type I) with common atrioventricular valve and a moderate or larger inlet VSD
U.S. Hospital Utilization
- An estimated 3,565 U.S. inpatient stays in 2023 included Q21.23 among the documented diagnoses.
- 1,090 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
POA indicator for congenital conditions/anomalies and Q00-Q99 exceptionCongenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. Congenital conditions are always considered present on admission.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026