Q21.9

Q21.9: Congenital malformation of cardiac septum, unspecified

Billable / specific codeICD-10-CMPOA exempt

Q21.9 is a billable, specific ICD-10-CM code for congenital malformation of cardiac septum, unspecified. It is valid for submission on a claim.

Check Q21.9 with the rest of the claim: free scrubber

Inclusion terms

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

Septal (heart) defect NOS

Excludes1 inherited from the categories above Q21.9

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

Q21.9 is named in 13 Medicare coverage policies: 13 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

Anomaly, anomalous›bulbus cordis
Defect, defective›septal NOS(heart)
Anomaly, anomalous›cardiac›septal closure
Anomaly, anomalous›heart›septum
Deformity›heart›septum
Malformation›cardiac›septum
Imperfect›closure›septum›heart

Code history

Unchanged in every release from FY2024 to FY2027.