ICD-10-CM 2027
ICD-10 code for aortic disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › aortic (heart) (valve)”. Page updated September 29, 2026.
About coding aortic disease
The ICD-10-CM code for aortic disease is I35.9 (Nonrheumatic aortic valve disorder, 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 I35.9.
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.
More specific aortic disease codes (official index)
- rheumatic I06.9 — Rheumatic aortic valve disease, unspecified
Common questions about aortic disease ICD-10 codes
What is the ICD-10 code for aortic disease?
- I35.9 — Nonrheumatic aortic valve disorder, unspecified. More specific codes apply when the documentation supports them: I06.9.
What is the ICD-10 code for rheumatic aortic disease?
- I06.9 — Rheumatic aortic valve disease, 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.