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ICD-10/Q21.19

Q21.19 ICD-10-CM Code: Other specified atrial septal defect

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 306 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH MCC (MDC 05)
  • MS-DRG 307 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT MCC (MDC 05)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Other specified atrial septal defect is a billable ICD-10-CM diagnosis code (Q21.19).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for Q21.19 in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Common atrium
  • Other specified atrial septal abnormality

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • acquired cardiac septal defect (I51.0)

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q21.19 in its code family, with their registry titles.

  • 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
  • Q21.2 — 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

View all codes in the Q21 family

Indexed Clinical Terms (27)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • 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