Q21.21

Billable

Partial atrioventricular septal defect

Q21.21 is the ICD-10-CM code for Partial atrioventricular septal defect. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
Q00-Q99
Parent
Q21.2
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

Includes

  • Incomplete atrioventricular canal
  • Incomplete atrioventricular septal defect
  • Incomplete endocardial cushion defect
  • Ostium primum atrial septal defect (type I) with separate atrioventricular valves
  • Partial atrioventricular canal
  • Partial endocardial cushion defect

Frequently asked questions

What is ICD-10 code Q21.21?
Q21.21 is the ICD-10-CM code for "Partial atrioventricular septal defect". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q21.21 a billable code?
Yes — Q21.21 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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