2026 ICD-10-CM Diagnosis Code I25.41Coronary artery aneurysm

ICD-10-CM Codes›I00–I99›I20-I25›I25

ICD-10-CM I25.41
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I25.41 is a billable ICD-10-CM diagnosis code for coronary artery aneurysm. 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
I25.41
Billable Status
Yes — Valid for Submission
Code Describes
Coronary artery aneurysm
Short Description
Coronary artery aneurysm
Same as the full description in the CMS dataset.
Parent Code
I25.4
Coronary artery aneurysm and dissection

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI25Chronic ischemic heart disease
This CodeI25.41Coronary artery aneurysm

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired arteriovenous fistula of heart
  • Acquired coronary artery fistula
  • Aneurysm of coronary artery due to and following acute febrile mucocutaneous lymph node syndrome
  • Aneurysm of coronary vessels
  • Arteriovenous fistula of coronary artery to coronary sinus
  • Arteriovenous fistula of coronary artery to superior vena cava
  • Coronary artery fistula
  • Coronary artery fistula to left ventricle
  • Coronary artery fistula to right ventricle
  • Coronary artery fistula with dilatation of entire coronary artery
  • Coronary artery fistula with dilatation of proximal coronary artery and without dilatation of distal coronary artery
  • Fistula of coronary sinus
  • Iatrogenic coronary artery fistula
  • Multiple coronary artery fistulae
  • Single coronary artery fistula
  • Truncal arteriovenous fistula

Tabular List NotesGuidance

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

Inclusion Terms

  • Coronary arteriovenous fistula, acquired

Type 1 Excludes

  • congenital coronary artery aneurysm Q24.5

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)
      • arteriovenous (congenital)
        • acquired
          • coronary
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • coronary (arteriosclerotic) (artery)
    • Fistula(cutaneous)
      • arteriovenous (acquired) (nonruptured)
        • coronary
    • Fistula(cutaneous)
      • coronary, arteriovenous

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

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 I25.41 to ICD-9-CMHistory

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

ICD-9-CM
414.11 Aneurysm coronary vessel
Exact Match The mapping is direct, with no qualifiers.

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 I25.41Overview

Is I25.41 (Coronary artery aneurysm and dissection) a billable code?

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

What MS-DRG does I25.41 group to?

When coronary artery aneurysm 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 I25.41?

Under the General Equivalence Mappings, coronary artery aneurysm converts to ICD-9-CM 414.11 (aneurysm coronary vessel). The mapping is a direct match.

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.