Q21.4
Aortopulmonary septal defect
Billable code
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
This code · Q21.4
Synonyms
Aortic septal defect Aortopulmonary window
Inherited from Q21Congenital malformations of cardiac septa
Excludes 1
acquired cardiac septal defect (I51.0)
Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2
inborn errors of metabolism (E70-E88)
Note
Codes from this chapter are not for use on maternal records
Official Guidelines for Q21.4
FY 2026 ›Sections that reference Q21.4
Sections whose FY 2026 text names Q21.4, its Q21 category, or a range containing it — the chapter guidance above is the authoritative source.
Find Q21.4 in the alphabetic index
8 index paths lead to this code
- Defect, defective › aorticopulmonary septum
- Fenestration, fenestrated › aortico-pulmonary
- Window › aorticopulmonary
- Absence › septum › between aorta and pulmonary artery
- Agenesis › septum › between aorta and pulmonary artery
- Communication › between › base of aorta and pulmonary artery
- Imperfect › closure › septum › aorticopulmonary
- Imperfect › closure › septum › between aorta and pulmonary artery