ICD-10-CM Diagnosis Code (2025)
Official Description for Q21
Congenital malformations of cardiac septa
Coding Notes & Guidelines for Q21
acquired cardiac septal defect (I51.0)
ostium primum atrial septal defect (type I) (Q21.20)
Roger's disease
- Fenestrated atrial septum
- Patent or persistent ostium secundum defect (type II)
Persistent foramen ovale
- Coronary sinus defect
- Unroofed coronary sinus
Superior vena cava type atrial septal defect
Inferior vena cava type atrial septal defect
Sinus venosus defect, NOS
- Common atrium
- Other specified atrial septal abnormality
- Atrioventricular canal defect
- Endocardial cushion defect
- Ostium primum atrial septal defect (type I)
- Atrioventricular canal, NOS
- Endocardial cushion defect NOS
- Ostium primum atrial septal defect (type I) NOS
- Incomplete atrioventricular canal
- Incomplete atrioventricular septal defect
- Incomplete endocardial cushion defect
- Ostium primum atrial septal defect (type I) with separate atrioventricular valves
- Partial atrioventricular canal
- Partial endocardial cushion defect
- Intermediate atrioventricular canal
- Intermediate atrioventricular septal defect
- Intermediate endocardial cushion defect
- Ostium primum atrial septal defect (type I) with separate atrioventricular valves and a small or restrictive inlet VSD
- Transitional atrioventricular canal
- Transitional endocardial cushion defect
- Common atrioventricular canal
- Common atrioventricular septal defect
- Common endocardial cushion defect
- Ostium primum atrial septal defect (type I) with common atrioventricular valve and a moderate or larger inlet VSD
Ventricular septal defect with pulmonary stenosis or atresia, dextroposition of aorta and hypertrophy of right ventricle.
- Aortic septal defect
- Aortopulmonary window
- Eisenmenger's defect
- Pentalogy of Fallot
Septal (heart) defect NOS
- , if applicable:
- Eisenmenger's complex (I27.83)
- Eisenmenger's syndrome (I27.83)
Child Codes (More Specific Codes for Q21):
About ICD-10-CM Code Q21 (Congenital malformations of cardiac septa)
ICD-10-CM code Q21 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 became effective on October 1, 2024.
This page provides detailed information about Q21 - Congenital malformations of cardiac septa. 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 Congenital malformations of cardiac septa.