ICD-10-CM 2027
ICD-10 code for aortic valve lesion
From the official ICD-10-CM alphabetic index entry “Lesion (s) (nontraumatic) › aortic (valve)”. Page updated September 29, 2026.
About coding aortic valve lesion
The ICD-10-CM code for aortic valve lesion is I35.9 (Nonrheumatic aortic valve disorder, unspecified).
Within I35, choose I35.9 (Nonrheumatic aortic valve disorder, unspecified) only when documentation doesn't support a more specific option: nonrheumatic aortic (valve) stenosis (I35.0), nonrheumatic aortic (valve) insufficiency (I35.1), nonrheumatic aortic (valve) stenosis with insufficiency (I35.2) and other nonrheumatic aortic valve disorders (I35.8).
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.
Common questions about aortic valve lesion ICD-10 codes
What is the ICD-10 code for aortic valve lesion?
- I35.9 — Nonrheumatic aortic valve disorder, unspecified.
Is I35.9 billable?
- Yes. I35.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I35.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I35.9 as a principal diagnosis.
Is I35.9 a CC or MCC?
- No. I35.9 is neither a CC nor an MCC under MS-DRG v44.0.