2026 ICD-10-CM Diagnosis Code I25.84Coronary atherosclerosis due to calcified coronary lesion

ICD-10-CM Codes›I00–I99›I20-I25›I25

ICD-10-CM I25.84
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I25.84 is a billable ICD-10-CM diagnosis code for coronary atherosclerosis due to calcified coronary lesion. 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. The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as calcific coronary arteriosclerosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Coronary atherosclerosis and other 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
I25.84
Billable Status
Yes — Valid for Submission
Code Describes
Coronary atherosclerosis due to calcified coronary lesion
Short Description
Coronary atherosclerosis due to calcified coronary lesion
Same as the full description in the CMS dataset.
Parent Code
I25.8
Other forms of chronic ischemic heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI25Chronic ischemic heart disease
This CodeI25.84Coronary atherosclerosis due to calcified coronary lesion

Code EditsBilling

Medicare Code Editor checks that affect claim validity for I25.84.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Calcific coronary arteriosclerosis
  • Calcification of coronary artery

Tabular List NotesGuidance

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

Inclusion Terms

  • Coronary atherosclerosis due to severely calcified coronary lesion

Code First

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.

    • Arteriosclerosis, arteriosclerotic(diffuse) (obliterans) (of) (senile) (with calcification)
      • coronary (artery)
        • due to
          • calcified coronary lesion (severely)
    • Atherosclerosis
      • coronary
        • artery
          • due to
            • calcified coronary lesion (severely)

Clinical ClassificationClinical

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

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

Patient EducationClinical

Atherosclerosis

Atherosclerosis is a condition in which plaque builds up inside your arteries. Plaque is a sticky substance made up of cholesterol, fat, blood cells, calcium, and other substances found in the blood. Over time, plaque hardens and causes your arteries to narrow. That limits the flow of oxygen-rich blood to your body.

The full article covers:

  • What is atherosclerosis?
  • What causes atherosclerosis?
  • Who is more likely to develop atherosclerosis?
  • What are the symptoms of atherosclerosis?
  • What other problems can atherosclerosis cause?
  • How is atherosclerosis diagnosed?
  • What are the treatments for atherosclerosis?
  • Can atherosclerosis be prevented?

Read the full article at MedlinePlus

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

Convert I25.84 to ICD-9-CMHistory

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

ICD-9-CM
414.4 Cor ath d/t calc cor lsn
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 I25.84Overview

Is I25.84 (Other forms of chronic ischemic heart disease) a billable code?

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

What MS-DRG does I25.84 group to?

On inpatient claims, coronary atherosclerosis due to calcified coronary lesion maps to MS-DRG 302, 303, with relative weights from 0.6732 to 1.1966 depending on complications. Higher weights mean higher Medicare reimbursement.

Can I25.84 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because coronary atherosclerosis due to calcified coronary lesion describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of I25.84?

Under the General Equivalence Mappings, coronary atherosclerosis due to calcified coronary lesion converts to ICD-9-CM 414.4 (cor ath d/t calc cor lsn). 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.