Q21.4

Q21.4: Aortopulmonary septal defect

Billable / specific codeICD-10-CMPOA exempt

Q21.4 is a billable, specific ICD-10-CM code for aortopulmonary septal defect. It is valid for submission on a claim.

Check Q21.4 with the rest of the claim: free scrubber

Inclusion terms

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

Aortic septal defect
Aortopulmonary window

Excludes1 inherited from the categories above Q21.4

A category’s note binds every code beneath it.

Written on Q21: Congenital malformations of cardiac septa

acquired cardiac septal defect (I51.0)

Other codes that can never be billed with Q21.4

Their own Excludes1 notes name this code, so the conflict is not listed above.

Q20.0Common arterial trunk

Risk adjustment

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

Medicare coverage

Q21.4 is named in 15 Medicare coverage policies: 15 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56451Billing and Coding: Cardiac Computed Tomography (CCT) and Coronary Computed Tomography Angiography (CCTA)
A56476Billing and Coding: Cardiac Radionuclide Imaging

Alphabetic index entries that lead here

Defect, defective›aorticopulmonary septum
Fenestration, fenestrated›aortico-pulmonary
Window›aorticopulmonary
Absence›septum›between aorta and pulmonary artery
Agenesis›septum›between aorta and pulmonary artery
Communication›between›base of aorta and pulmonary artery
Imperfect›closure›septum›aorticopulmonary
Imperfect›closure›septum›between aorta and pulmonary artery

Code history

Unchanged in every release from FY2024 to FY2027.