Q21.19

Billable
ChapterQ00–Q99
Ranksubcategory
Official Description

Other specified atrial septal defect

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99).

Instructional Notes

Includes
  • Common atrium
  • Other specified atrial septal abnormality
General instructions are available for the parent sections:
View CH17 NotesView Q21 NotesView Q21.1 Notes

Clinical Hierarchy

CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Q20-Q28Congenital malformations of the circulatory system (Q20-Q28)
Q21Congenital malformations of cardiac septa
Q21.1Atrial septal defect
Q21.19Other specified atrial septal defect

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to Q21.19:

subcategoryQ21.1
Atrial septal defect
View context instructions
categoryQ21
Congenital malformations of cardiac septa
View context instructions
chapterCH17
Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to Q21.19. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Abnormal, abnormality, abnormalities1 unique routes
atrial septal, specified NEC→Q21.19
Absence (of) (organ or part) (complete or partial)2 unique routes
atrial septum (congenital)→Q21.19
septum
atrial (congenital)→Q21.19
Acleistocardia1 unique routes
Direct index entry→Q21.19
Agenesis1 unique routes
septum
atrial→Q21.19
Anomaly, anomalous (congenital) (unspecified type)2 unique routes
heart(2 variants)
septum(2 variants)
auricular→Q21.19
interatrial→Q21.19
Closure1 unique routes
interauricular septum, defective→Q21.19
Common1 unique routes
atrium→Q21.19
Cor1 unique routes
triloculare
biventriculare→Q21.19
Defect, defective3 unique routes
atrial septal
specified NEC→Q21.19
interatrial septal→Q21.19
interauricular septal→Q21.19
Disease, diseased1 unique routes
Lutembacher's (atrial septal defect with mitral stenosis)→Q21.19
Fusion, fused (congenital)2 unique routes
atria→Q21.19
auricles, heart→Q21.19
Imperfect7 unique routes
closure (congenital)(7 variants)
interatrial ostium or septum→Q21.19
interauricular ostium or septum→Q21.19
ostium(2 variants)
interatrial→Q21.19
interauricular→Q21.19
septum(3 variants)
atrial (secundum)→Q21.19
interatrial (secundum)→Q21.19
interauricular (secundum)→Q21.19
Lutembacher's disease or syndrome (atrial septal defect with mitral stenosis)1 unique routes
Direct index entry→Q21.19
Patent1 unique routes
interauricular septum→Q21.19

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 306
Cardiac Congenital and Valvular Disorders with MCC
DRG 307
Cardiac Congenital and Valvular Disorders without MCC

Cross Reference

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