ICD-10-CM Q21.1: Atrial septal defect

ICD-10-CM Diagnosis Code (2025)

Official Description for Q21.1

Atrial septal defect

Coding Notes & Guidelines for Q21.1

Excludes2: Not Included Here

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

Inclusion Terms
  • Fenestrated atrial septum
  • Patent or persistent ostium secundum defect (type II)
Inclusion Terms

Persistent foramen ovale

Inclusion Terms
  • Coronary sinus defect
  • Unroofed coronary sinus
Inclusion Terms

Superior vena cava type atrial septal defect

Inclusion Terms

Inferior vena cava type atrial septal defect

Inclusion Terms

Sinus venosus defect, NOS

Inclusion Terms
  • Common atrium
  • Other specified atrial septal abnormality

Parent Code (Less Specific):

Q21 - Congenital malformations of cardiac septa

About ICD-10-CM Code Q21.1 (Atrial septal defect)

ICD-10-CM code Q21.1 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM Q21.1 became effective on October 1, 2024.

This page provides detailed information about Q21.1 - Atrial septal defect. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Atrial septal defect.