All ICD10 Codes

Q21

Non-Billable
ChapterQ00–Q99
Rankcategory
Official Description

Congenital malformations of cardiac septa

Use a more specific code (5 billable, 2 non-billable)
Q21.0Ventricular septal defectQ21.1Atrial septal defecthas subcodesQ21.2Atrioventricular septal defecthas subcodesQ21.3Tetralogy of FallotQ21.4Aortopulmonary septal defectQ21.8Other congenital malformations of cardiac septaQ21.9Congenital malformation of cardiac septum, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99).

CH17 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • inborn errors of metabolism (E70-E88)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • acquired cardiac septal defect (I51.0)

Clinical Hierarchy

BillableHas subcodes
CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Q20-Q28Congenital malformations of the circulatory system (Q20-Q28)
Q21Congenital malformations of cardiac septaNot billable
Q21.0Ventricular septal defectBillable
Q21.1Atrial septal defectSubcodes
Q21.2Atrioventricular septal defectSubcodes
Q21.3Tetralogy of FallotBillable
Q21.4Aortopulmonary septal defectBillable
Q21.8Other congenital malformations of cardiac septaBillable
Q21.9Congenital malformation of cardiac septum, unspecifiedBillable

Applicable Ancestor Context

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

chapterCH17
Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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