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Q21.9

Congenital malformation of cardiac septum, unspecified

Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 6 more specific codes sit alongside it. Worth checking whether the documentation supports one of them.
Exclusions 1 never code together
Q21code
Excludes1
  • acquired cardiac septal defect (I51.0)I51.0

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Instructional notes 1
Q21.9code
Inclusion terms
  • Septal (heart) defect NOS
Index entries leading here 5
  • Anomaly, anomalous (congenital) (unspecified type) Q89.9
  • Malformation (congenital) — see also Anomaly
  • Imperfect
    • closure (congenital)
  • Defect, defective Q89.9
    • septal (heart) NOS Q21.9
  • Deformity Q89.9
Alongside this code 6 same parent — Q21
Q21.0 Ventricular septal defect Q21.1 Atrial septal defect category Q21.2 Atrioventricular septal defect category Q21.3 Tetralogy of Fallot Q21.4 Aortopulmonary septal defect Q21.8 Other congenital malformations of cardiac septa
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable
yes
Code set
FY2026
Parent
Q21
Block
Q20-Q28
Siblings
6

Present FY2024–FY2027.