Q23.88Other congenital malformations of aortic and mitral valves

Q23.88 is the ICD-10-CM diagnosis code for other congenital malformations of aortic and mitral valves. It belongs to category Q23 (congenital malformations of aortic and mitral valves), block Q20-Q28 (congenital malformations of the circulatory system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q23.8, choose Q23.88 (Other congenital malformations of aortic and mitral valves) only when documentation doesn't support a more specific option: Bicuspid aortic valve (Q23.81) and congenital mitral valve cleft leaflet (Q23.82).

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.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2025, effective October 1, 2024.