I35.1 Nonrheumatic aortic (valve) insufficiency
The ICD-10-CM code for Nonrheumatic aortic (valve) insufficiency is I35.1 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- I30-I5A: Other forms of heart disease (I30-I5A)
- Category I35
- 6 codes (5 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to I35.1:
- Flint murmur (aortic insufficiency)
- Austin Flint murmur (aortic insufficiency)
- Murmur (cardiac) (heart) (organic) › Flint
- Insufficiency, insufficient › aortic (valve)
- Insufficiency, insufficient › aortic (valve) › specified cause NEC
Inclusion Terms
- Nonrheumatic aortic (valve) incompetence NOS
- Nonrheumatic aortic (valve) regurgitation NOS
U.S. Hospital Utilization
- An estimated 121,250 U.S. inpatient stays in 2023 included I35.1 among the documented diagnoses.
- 5,500 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
Presumed relationship due to Index term “with”The classification presumes a causal relationship between hypertension and heart involvement and between hypertension and kidney involvement, as the two conditions are linked by the term “with” in the Alphabetic Index. These conditions should be coded as related even in the absence of provider documentation explicitly linking them, unless the documentation clearly states the conditions are unrelated.
Provider must link conditions not specifically indexed as relatedFor hypertension and conditions not specifically linked by relational terms such as “with,” “associated with” or “due to” in the classification, provider documentation must link the conditions in order to code them as related.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026