Q21.21

Q21.21: Partial atrioventricular septal defect

Billable / specific codeICD-10-CMPOA exempt

Q21.21 is a billable, specific ICD-10-CM code for partial atrioventricular septal defect. It is valid for submission on a claim.

Check Q21.21 with the rest of the claim: free scrubber

Inclusion terms

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

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

Excludes1 inherited from the categories above Q21.21

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

Q21.21 is named in 19 Medicare coverage policies: 19 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
A56451Billing and Coding: Cardiac Computed Tomography (CCT) and Coronary Computed Tomography Angiography (CCTA)

Alphabetic index entries that lead here

Incomplete›endocardial cushion defect
Canal›atrioventricular›incomplete
Canal›atrioventricular›partial
Defect, defective›cushion, endocardial›incomplete
Incomplete›atrioventricular›canal
Incomplete›atrioventricular›septal defect
Defect, defective›atrioventricular›septal›incomplete
Defect, defective›atrioventricular›septal›partial
Defect, defective›atrial septal›ostium primum type›with›separate atrioventricular valves

Code history

Unchanged in every release from FY2024 to FY2027.