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