Q21.11

Secundum atrial septal defect

Billable / specificPOA exempt

Q21.11 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Applicable to

  • Fenestrated atrial septum
  • Patent or persistent ostium secundum defect (type II)

Includes (from Q21)

  • Note: Codes from this chapter are not for use on maternal records

Excludes1

Not coded here — never report together with this code.

  • acquired cardiac septal defect (I51.0) (from Q21)

Excludes2

Not included here — may be reported together when both conditions exist.

  • ostium primum atrial septal defect (type I) (Q21.20) (from Q21.1)
  • inborn errors of metabolism (E70-E88) (from Q21)

Also known as

  • Fenestrated atrial septum
  • Patent or persistent ostium secundum defect (type II)
  • Defect, defective, atrial septal, ostium secundum type
  • Defect, defective, ostium, secundum
  • Fenestration, fenestrated, atrial septum
  • Imperfect, closure, atrium
  • Ostium, secundum
  • Patent, ostium secundum
  • Persistence, persistent, ostium, secundum

Parent code

  • Q21.1Atrial septal defectHeader

Related codes

  • Q21.10Atrial septal defect, unspecifiedBillable
  • Q21.12Patent foramen ovaleBillable
  • Q21.13Coronary sinus atrial septal defectBillable
  • Q21.14Superior sinus venosus atrial septal defectBillable
  • Q21.15Inferior sinus venosus atrial septal defectBillable
  • Q21.16Sinus venosus atrial septal defect, unspecifiedBillable
  • Q21.19Other specified atrial septal defectBillable

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