2026 ICD-10-CM Diagnosis Code I25.3Aneurysm of heart

ICD-10-CM Codes›I00–I99›I20-I25›I25

ICD-10-CM I25.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I25.3 is a billable ICD-10-CM diagnosis code for aneurysm of heart. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined heart disease.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such selected atherosclerosis, ischemia, and infarction.

Code Identity

ICD-10-CM Code
I25.3
Billable Status
Yes — Valid for Submission
Code Describes
Aneurysm of heart
Short Description
Aneurysm of heart
Same as the full description in the CMS dataset.
Parent Code
I25
Chronic ischemic heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI25Chronic ischemic heart disease
This CodeI25.3Aneurysm of heart

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormality of left atrial appendage
  • Abnormality of right atrial appendage
  • Acquired abnormality of mitral subvalvular apparatus
  • Acquired abnormality of right cardiac ventricle
  • Acquired aneurysm of left cardiac ventricle
  • Acquired aneurysm of right cardiac ventricle
  • Acquired subaortic aneurysm of left ventricle
  • Acquired submitral aneurysm of left ventricle
  • Aneurysm of heart
  • Aneurysm of membranous septum
  • Aneurysm of muscular septum
  • Aneurysm of patch of atrioventricular septal defect
  • Aneurysm of patch of left ventricular outflow tract
  • Aneurysm of patch of right ventricular outflow tract
  • Aneurysm of patch of ventricular septal defect
  • Aortic left ventricular tunnel
  • Aortic tunnel
  • Aortico-left ventricular tunnel with intracardiac aneurysm of septal portion
  • Apical hypertrophic cardiomyopathy with aneurysm
  • Arterial obstruction due to thrombotic embolism from aneurysm of ventricle
  • Atrial aneurysm
  • Atrial septal aneurysm
  • Coronary fistulae from right ventricle
  • Left atrial appendage aneurysm
  • Left ventricular aneurysm
  • Postprocedural left ventricular aneurysm
  • Postprocedural right ventricular aneurysm
  • Right atrial appendage aneurysm
  • Right ventricular aneurysm
  • Ventricular aneurysm
  • Ventricular aneurysm due to and following acute myocardial infarction
  • Ventricular septal aneurysm

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Mural aneurysm
  • Ventricular aneurysm

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.

    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • cardiac (false)
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • heart (wall) (chronic or with a stated duration of over 4 weeks)

Clinical ClassificationClinical

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

CCSR CIR015
Other and ill-defined heart disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Left Ventricular Aneurysm

    a bulge or ballooning in the wall of the left ventricle of the heart.

  • Ventricular Aneurysm

    a bulge or ballooning in the wall of the ventricle of the heart. (acc)

  • Ventricular Aneurysm Resection|VENTRICULAR ANEURYSM RESECTION

    cardiac surgical procedure performed for the removal of an aneurysm from the ventricular wall.

Patient EducationClinical

Aneurysms

An aneurysm is a bulge or "ballooning" in the wall of an artery. Arteries are blood vessels that carry oxygen-rich blood from the heart to other parts of the body. If an aneurysm grows large, it can burst and cause dangerous bleeding or even death.

Read the full article at MedlinePlus

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

Convert I25.3 to ICD-9-CMHistory

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

ICD-9-CM
414.10 Aneurysm of heart
Approximate The match is approximate rather than exact.
ICD-9-CM
414.19 Aneurysm of heart NEC
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 I25.3Overview

Is I25.3 (Chronic ischemic heart disease) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report aneurysm of heart on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I25.3 group to?

When aneurysm of heart is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I25.3?

Under the General Equivalence Mappings, aneurysm of heart converts to ICD-9-CM 414.10 (aneurysm of heart) and 414.19 (aneurysm of heart NEC). 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.