ICD-10 code for Isomerism atrial appendages

The ICD-10-CM code for Isomerism atrial appendages is Q20.6 (Isomerism of atrial appendages).

Within Q20 (congenital malformations of cardiac chambers and connections), Q20.6 is specifically for Isomerism of atrial appendages. Related codes cover common arterial trunk (Q20.0), Double outlet right ventricle (Q20.1), Double outlet left ventricle (Q20.2), Discordant ventriculoarterial connection (Q20.3), Double inlet ventricle (Q20.4), Discordant atrioventricular connection (Q20.5), other congenital malformations of cardiac chambers and connections (Q20.8) and congenital malformation of cardiac chambers and connections, unspecified (Q20.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.