2026 ICD-10-CM Diagnosis Code I25.720Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris

ICD-10-CM Codes›I00–I99›I20-I25›I25

ICD-10-CM I25.720
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I25.720 is a billable ICD-10-CM diagnosis code for atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris. 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 restricted by the Medicare Code Editor to adult patients (age 15 through 124). Coders also document this condition as preinfarction syndrome. 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
I25.720
Billable Status
Yes — Valid for Submission
Code Describes
Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris
Short Description
Athscl autologous artery CABG w unstable angina pectoris
Parent Code
I25.72
Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI25Chronic ischemic heart disease
This CodeI25.720Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris

Code EditsBilling

Medicare Code Editor checks that affect claim validity for I25.720.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Preinfarction syndrome
  • Unstable angina due to arteriosclerosis of autologous arterial coronary artery bypass graft

Tabular List NotesGuidance

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

Type 1 Excludes

  • unstable angina without atherosclerosis of autologous artery coronary artery bypass grafts I20.0

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)
        • bypass graft
          • autologous artery
            • with
              • angina pectoris
                • unstable

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

Patient EducationClinical

Angina

Angina is chest pain or discomfort you feel when there is not enough blood flow to your heart muscle. Your heart muscle needs the oxygen that the blood carries. Angina may feel like pressure or a squeezing pain in your chest. It may feel like indigestion. You may also feel pain in your shoulders, arms, neck, jaw, or back.

Read the full article at MedlinePlus

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

Convert I25.720 to ICD-9-CMHistory

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

ICD-9-CM
414.04 Cor ath artry bypas grft
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
411.1 Intermed coronary synd
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 I25.720Overview

Is I25.720 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I25.720 group to?

When atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris 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.

Who can I25.720 be reported for?

The Medicare Code Editor checks atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of I25.720?

Under the General Equivalence Mappings, atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris converts to ICD-9-CM 414.04 (cor ath artry bypas grft) and 411.1 (intermed coronary synd). 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.