ICD-10-CM 2027
ICD-10 code for aortic cusps supernumerary
From the official ICD-10-CM alphabetic index entry “Supernumerary (congenital) › aortic cusps”. Page updated September 29, 2026.
About coding aortic cusps supernumerary
The ICD-10-CM code for aortic cusps supernumerary is Q23.88 (Other congenital malformations of aortic and mitral valves).
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.
Common questions about aortic cusps supernumerary ICD-10 codes
What is the ICD-10 code for aortic cusps supernumerary?
- Q23.88 — Other congenital malformations of aortic and mitral valves.
Is Q23.88 billable?
- Yes. Q23.88 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q23.88 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q23.88 as a principal diagnosis.
Is Q23.88 a CC or MCC?
- No. Q23.88 is neither a CC nor an MCC under MS-DRG v44.0.