2026 ICD-10-CM Diagnosis Code I25.5Ischemic cardiomyopathy

ICD-10-CM Codes›I00–I99›I20-I25›I25

ICD-10-CM I25.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I25.5 is a billable ICD-10-CM diagnosis code for ischemic cardiomyopathy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 302 through 303. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Coronary atherosclerosis and other heart disease and Myocarditis and cardiomyopathy.

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
I25.5
Billable Status
Yes — Valid for Submission
Code Describes
Ischemic cardiomyopathy
Short Description
Ischemic cardiomyopathy
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 CodeI25.5Ischemic cardiomyopathy

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congestive heart failure stage B
  • Congestive heart failure stage B due to ischemic cardiomyopathy
  • Congestive heart failure stage C
  • Congestive heart failure stage C due to ischemic cardiomyopathy
  • Generalized ischemic myocardial dysfunction
  • Ischemic congestive cardiomyopathy
  • Ischemic dilated cardiomyopathy due to coronary artery disease
  • Ischemic myocardial dysfunction
  • Systolic heart failure stage B
  • Systolic heart failure stage B due to ischemic cardiomyopathy
  • Systolic heart failure stage C
  • Systolic heart failure stage C due to ischemic cardiomyopathy

Tabular List NotesGuidance

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

Type 2 Excludes

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.

    • Cardiomyopathy(familial) (idiopathic)
      • ischemic
    • Disease, diseased
      • heart (organic)
        • ischemic (chronic or with a stated duration of over 4 weeks)
          • cardiomyopathy
    • Ischemia, ischemic
      • cardiomyopathy

Clinical ClassificationClinical

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

CCSR CIR011
Coronary atherosclerosis and other heart disease
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR005
Myocarditis and cardiomyopathy
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Cardiomyopathy

Cardiomyopathy is the name for diseases of the heart muscle. These diseases enlarge your heart muscle or make it thicker and more rigid than normal. In rare cases, scar tissue replaces the muscle tissue.

Read the full article at MedlinePlus

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

Convert I25.5 to ICD-9-CMHistory

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

ICD-9-CM
414.8 Chr ischemic hrt dis 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 I25.5Overview

Is I25.5 (Chronic ischemic heart disease) a billable code?

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

What MS-DRG does I25.5 group to?

When ischemic cardiomyopathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 302, 303, with relative weights from 0.6732 to 1.1966 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I25.5?

Under the General Equivalence Mappings, ischemic cardiomyopathy converts to ICD-9-CM 414.8 (chr ischemic hrt dis 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.