ICD-10 code for aortic valve malformation

The ICD-10-CM code for aortic valve malformation is Q23.9 (Congenital malformation of aortic and mitral valves, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Q23.9.

Within Q23, choose Q23.9 (Congenital malformation of aortic and mitral valves, unspecified) only when documentation doesn't support a more specific option: congenital stenosis of aortic valve (Q23.0), congenital insufficiency of aortic valve (Q23.1), congenital mitral stenosis (Q23.2), congenital mitral insufficiency (Q23.3), Hypoplastic left heart syndrome (Q23.4) and other congenital malformations of aortic and mitral valves (Q23.8).

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.