Q21.3

Tetralogy of Fallot

Billable FY2026 2025-10-01 → 2026-09-30

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

Q21.3code

Inclusion terms

Ventricular septal defect with pulmonary stenosis or atresia, dextroposition of aorta and hypertrophy of right ventricle.

Index entries leading here 9

Anomaly, anomalous (congenital) (unspecified type) Q89.9
- heart Q24.9
  - septum Q21.9
    - interventricular Q21.0
      - with pulmonary stenosis or atresia, dextraposition of aorta and hypertrophy of right ventricle Q21.3
    - ventricular Q21.0
      - with pulmonary stenosis or atresia, dextraposition of aorta and hypertrophy of right ventricle Q21.3
  - tetralogy of Fallot Q21.3
Imperfect
- closure (congenital)
  - septum
    - interventricular Q21.0
      - in tetralogy of Fallot Q21.3
    - ventricular Q21.0
      - in tetralogy of Fallot Q21.3
      - with pulmonary stenosis or atresia, dextraposition of aorta, and hypertrophy of right ventricle Q21.3
Defect, defective Q89.9
- interventricular septal Q21.0
  - with dextroposition of aorta, pulmonary stenosis and hypertrophy of right ventricle Q21.3
  - in tetralogy of Fallot Q21.3
- ventricular septal Q21.0
  - in tetralogy of Fallot Q21.3
Dextraposition, aorta Q20.3
- in tetralogy of Fallot Q21.3
Fallot's
- tetrad or tetralogy Q21.3
Syndrome — see also Disease
- Fallot's Q21.3
Hypertrophy, hypertrophic
- ventricle, ventricular (heart) — see also Hypertrophy, cardiac
  - in tetralogy of Fallot Q21.3
Stenosis, stenotic (cicatricial) — see also Stricture
- pulmonary (artery) (congenital) Q25.6
  - in tetralogy of Fallot Q21.3
  - with ventricular septal defect, transposition of aorta, and hypertrophy of right ventricle Q21.3
Tetralogy of Fallot Q21.3

Alongside this code 6 same parent — Q21

Q21.0 Ventricular septal defect Q21.1 Atrial septal defect category Q21.2 Atrioventricular septal defect category Q21.4 Aortopulmonary septal defect Q21.8 Other congenital malformations of cardiac septa Q21.9 Congenital malformation of cardiac septum, unspecified

Medications 1

1 Tetralogy of Fallot drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

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

This code

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

Present FY2024–FY2027.

Q21.3

Risk adjustment

This code