ICD-10 code for Triloculare cor

The ICD-10-CM code for Triloculare cor is Q20.8 (Other congenital malformations of cardiac chambers and connections). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Q20.8.

Within Q20, choose Q20.8 (Other congenital malformations of cardiac chambers and connections) only when documentation doesn't support a more specific option: 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), Isomerism of atrial appendages (Q20.6) 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.