2026 ICD-10-CM Diagnosis Code I25.41Coronary artery aneurysm
ICD-10-CM Codes›I00–I99›I20-I25›I25
- Billable — Valid for Submission
- Chronic Condition
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.
I25.41 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 188 for payment year 2026.
This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such selected atherosclerosis, ischemia, and infarction.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I25.41 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
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
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) I72.9
arteriovenous (congenital) See Also: Malformation, arteriovenous;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About I25.41Overview
What is the ICD-10 code for coronary artery aneurysm?
The ICD-10-CM code for coronary artery aneurysm is I25.41 (sometimes written as I2541). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
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.
Does I25.41 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: I25.41 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 188 (Coronary Artery Disease).
