Q21.19 Other specified atrial septal defect

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Common atrium
• Other specified atrial septal abnormality

Applies from Q21 Congenital malformations of cardiac septa

Excludes1 (never code together)

• acquired cardiac septal defect (I51.0)

Applies from Q21.1 Atrial septal defect

Excludes2 (not included here)

• ostium primum atrial septal defect (type I) (Q21.20)

MS-DRG index

Defines the logic of DRG(s) 306-307 in MDC 05.

Code annotations containing back-references to Q21.19

Back-references to Q21.1

• Code Also: I27.83 Eisenmenger's syndrome ("atrial septal defect (Q21.1-)")

Back-references to Q21

• Code Also: I27.21 Secondary pulmonary arterial hypertension ("congenital heart disease (Q20-Q28)")
• Type 2 Excludes: P29 Cardiovascular disorders originating in the perinatal period ("congenital malformations of the circulatory system (Q20-Q28)")
• Code Also: Q87.85 MED13L syndrome ("congenital malformations of cardiac septa (Q21.-)")
• Code Also: Z71.87 Encounter for pediatric-to-adult transition counseling ("congenital malformations of the circulatory system (Q20-Q28)")

Diagnosis Index entries for Q21.19

• Abnormal, abnormality, abnormalities › atrial septal, specified NEC
• Absence (of) (organ or part) (complete or partial) › atrial septum (congenital)
• Absence (of) (organ or part) (complete or partial) › septum › atrial (congenital)
• Acleistocardia
• Agenesis › septum › atrial
• Anomaly, anomalous (congenital) (unspecified type) › heart › septum › auricular
• Anomaly, anomalous (congenital) (unspecified type) › heart › septum › interatrial
• Closure › interauricular septum, defective
• Common › atrium
• Cor › triloculare › biventriculare
• Defect, defective › atrial septal › specified NEC
• Defect, defective › interatrial septal
• Defect, defective › interauricular septal
• Disease, diseased › Lutembacher's (atrial septal defect with mitral stenosis)
• Fusion, fused (congenital) › atria
• Fusion, fused (congenital) › auricles, heart
• Imperfect › closure (congenital) › interatrial ostium or septum
• Imperfect › closure (congenital) › interauricular ostium or septum
• Imperfect › closure (congenital) › ostium › interatrial
• Imperfect › closure (congenital) › ostium › interauricular
• Imperfect › closure (congenital) › septum › atrial (secundum)
• Imperfect › closure (congenital) › septum › interatrial (secundum)
• Imperfect › closure (congenital) › septum › interauricular (secundum)
• Lutembacher's disease or syndrome (atrial septal defect with mitral stenosis)
• Patent › interauricular septum
• Perforation, perforated (nontraumatic) (of) › atrial septum, multiple
• Syndrome › Lutembacher's

Nearby codes

• Q21.12 Patent foramen ovale
• Q21.13 Coronary sinus atrial septal defect
• Q21.14 Superior sinus venosus atrial septal defect
• Q21.15 Inferior sinus venosus atrial septal defect
• Q21.16 Sinus venosus atrial septal defect, unspecified
• Q21.19 Other specified atrial septal defect (this code)
• Q21.2 Atrioventricular septal defect
• Q21.20 Atrioventricular septal defect, unspecified as to partial or complete
• Q21.21 Partial atrioventricular septal defect
• Q21.22 Transitional atrioventricular septal defect
• Q21.23 Complete atrioventricular septal defect