Q21.20

Q21.20: Atrioventricular septal defect, unspecified as to partial or complete

Billable / specific codeICD-10-CMPOA exempt

Q21.20 is a billable, specific ICD-10-CM code for atrioventricular septal defect, unspecified as to partial or complete. It is valid for submission on a claim.

Check Q21.20 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Atrioventricular canal, NOS
Endocardial cushion defect NOS
Ostium primum atrial septal defect (type I) NOS

Excludes1 inherited from the categories above Q21.20

A category’s note binds every code beneath it.

Written on Q21: Congenital malformations of cardiac septa

acquired cardiac septal defect (I51.0)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

Q21.20 is named in 14 Medicare coverage policies: 14 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A52868Billing and Coding: Transesophageal Echocardiography (TEE)
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56500Billing and Coding: Cardiac Catheterization and Coronary Angiography

Alphabetic index entries that lead here

Canal›atrioventricular
Defect, defective›cushion, endocardial
Endocardium, endocardial›cushion defect
Ostium›primum(arteriosum) (defect) (persistent)
Persistence, persistent›atrioventricular canal
Single›atrium
Defect, defective›atrial septal›ostium primum type(type I)
Defect, defective›atrioventricular›canal
Defect, defective›atrioventricular›septum
Defect, defective›ostium›primum
Imperfect›closure›atrioventricular ostium
Persistence, persistent›ostium›primum

Code history

Unchanged in every release from FY2024 to FY2027.