2026 ICD-10-CM Diagnosis Code I35.0Nonrheumatic aortic (valve) stenosis

ICD-10-CM Codes›I00–I99›I30-I5A›I35

ICD-10-CM I35.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I35.0 is a billable ICD-10-CM diagnosis code for nonrheumatic aortic (valve) stenosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 306 through 307. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonrheumatic and unspecified valve disorders.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such nonrheumatic valve disorders - aortic valve disorders.

Code Identity

ICD-10-CM Code
I35.0
Billable Status
Yes — Valid for Submission
Code Describes
Nonrheumatic aortic (valve) stenosis
Short Description
Nonrheumatic aortic (valve) stenosis
Same as the full description in the CMS dataset.
Parent Code
I35
Nonrheumatic aortic valve disorders

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI35Nonrheumatic aortic valve disorders
This CodeI35.0Nonrheumatic aortic (valve) stenosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired stenosis of supravalvar area
  • Acquired subaortic stenosis
  • Acquired subaortic stenosis associated with functionally univentricular heart
  • Acquired subaortic stenosis due to restrictive ventricular septal defect associated with functionally univentricular heart
  • Aortic stenosis with doming
  • Aortic stenosis, non-rheumatic
  • Aortic valve stenosis
  • Critical stenosis of aortic valve
  • Diffuse supravalvar aortic stenosis
  • Disorder of aortic valve prosthesis
  • Dynamic aortic outflow tract obstruction
  • Functionally univentricular heart
  • Isolated aortic stenosis
  • Localized supravalvar aortic stenosis
  • Mild aortic valve stenosis
  • Mixed aortic valve disease
  • Moderate aortic valve stenosis
  • Neoaortic valve stenosis
  • Obstruction of aortic outflow
  • Obstruction of aortic valve due to neoplasm
  • Obstruction of ascending aorta
  • Postprocedural aortic valve stenosis
  • Prosthetic aortic valve stenosis
  • Senile aortic stenosis
  • Severe aortic valve stenosis
  • Shelf-like supravalvar aortic stenosis
  • Stenosis of aortic arch following procedure
  • Stenosis of thoracic aorta
  • Subaortic stenosis as complication of procedure
  • Subaortic stenosis associated with functionally univentricular heart as complication of procedure
  • Supravalvar aortic stenosis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Stenosis, stenotic(cicatricial)
      • aortic (valve)
    • Stenosis, stenotic(cicatricial)
      • aortic (valve)
        • specified cause NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR003
Nonrheumatic and unspecified valve disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Aortic Valve Stenosis

    a pathological constriction that can occur above (supravalvular stenosis), below (subvalvular stenosis), or at the aortic valve. it is characterized by restricted outflow from the left ventricle into the aorta.

  • Aortic Valve Stenosis

    narrowing of the orifice of the aortic valve.

  • Congenital Aortic Valve Stenosis|Congenital stenosis of aortic valve

    aortic valve stenosis that is present at birth.

  • Non-Rheumatic Aortic Valve Stenosis with Insufficiency|Nonrheumatic aortic (valve) stenosis with insufficiency

    evidence of non-rheumatic aortic valve stenosis with insufficiency.

  • Non-Rheumatic Aortic Valve Stenosis|Nonrheumatic aortic (valve) stenosis

    evidence of non-rheumatic aortic valve stenosis.

Patient EducationClinical

Heart Valve Diseases

Heart valve disease happens when one or more of your heart valves don't work well.

The full article covers:

  • What are heart valve diseases?
  • What are the types of heart valve diseases?
  • What causes heart valve diseases?
  • Who is more likely to develop heart valve diseases?
  • What are the symptoms of heart valve diseases?
  • What other problems can heart valve diseases cause?
  • How is heart valve disease diagnosed?
  • What are the treatments for heart valve diseases?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I35.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
424.1 Aortic valve disorder
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I35.0Overview

Is I35.0 (Nonrheumatic aortic valve disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report nonrheumatic aortic (valve) stenosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I35.0 group to?

When nonrheumatic aortic (valve) stenosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9132 to 1.5758 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I35.0?

Under the General Equivalence Mappings, nonrheumatic aortic (valve) stenosis converts to ICD-9-CM 424.1 (aortic valve disorder). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.