Q21.22 Transitional atrioventricular septal defect
The ICD-10-CM code for Transitional atrioventricular septal defect is Q21.22 (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 Q21.22:
- Defect, defective › cushion, endocardial › intermediate
- Canal › atrioventricular › intermediate
- Canal › atrioventricular › transitional
- Defect, defective › cushion, endocardial › transitional
- Defect, defective › atrioventricular › septal › transitional
- Defect, defective › atrioventricular › septal › intermediate
- Defect, defective › atrial septal › ostium primum type (type I) › with › separate atrioventricular valves › and small or restrictive inlet VSD
Inclusion Terms
- Intermediate atrioventricular canal
- Intermediate atrioventricular septal defect
- Intermediate endocardial cushion defect
- Ostium primum atrial septal defect (type I) with separate atrioventricular valves and a small or restrictive inlet VSD
- Transitional atrioventricular canal
- Transitional endocardial cushion defect
U.S. Hospital Utilization
- An estimated 600 U.S. inpatient stays in 2023 included Q21.22 among the documented diagnoses.
- 220 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