Q21.2

Atrioventricular septal defect

Header / non-billable

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This code does not map to a risk-adjusting HCC in the loaded models.

Excludes 1 never coded together · Excludes 2 may co-exist

This code · Q21.2

Synonyms

Atrioventricular canal defect Endocardial cushion defect Ostium primum atrial septal defect (type I)

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

Sections that reference Q21.2

Sections whose FY 2026 text names Q21.2, its Q21 category, or a range containing it — the chapter guidance above is the authoritative source.