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ICD10BillableValid for clinical use

ICD-10 Code I25.9: Chronic ischemic heart disease, unspecified

I25.9 is a billable ICD-10 diagnosis code used to classify Chronic ischemic heart disease, unspecified in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

When is it used?

  • May be used when a clinician documents chronic ischemic heart disease, unspecified in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
9Diseases of the circulatory system (I00-I99)
block
I20-I25Ischemic heart diseases
category
I25Chronic ischemic heart disease
currentI25

Official coding notes

Inclusion terms
  • Ischemic heart disease (chronic) NOS

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

CardiologistGeneral PhysicianENT Specialist

Coverage-related procedures and services

CPT 75574high
COMPUTED TOMOGRAPHIC ANGIOGRAPHY, HEART, CORONARY ARTERIES AND BYPASS GRAFTS (WHEN PRESENT), WITH CONTRAST MATERIAL, INCLUDING 3D IMAGE POSTPROCESSING (INCLUDING EVALUATION OF CARDIAC STRUCTURE AND MORPHOLOGY, ASSESSMENT OF CARDIAC FUNCTION, AND EVALUATION OF VENOUS STRUCTURES, IF PERFORMED)
Source: CMS coverage guidance
CPT 75572high
COMPUTED TOMOGRAPHY, HEART, WITH CONTRAST MATERIAL, FOR EVALUATION OF CARDIAC STRUCTURE AND MORPHOLOGY (INCLUDING 3D IMAGE POSTPROCESSING, ASSESSMENT OF CARDIAC FUNCTION, AND EVALUATION OF VENOUS STRUCTURES, IF PERFORMED)
Source: CMS coverage guidance
CPT 75573high
COMPUTED TOMOGRAPHY, HEART, WITH CONTRAST MATERIAL, FOR EVALUATION OF CARDIAC STRUCTURE AND MORPHOLOGY IN THE SETTING OF CONGENITAL HEART DISEASE (INCLUDING 3D IMAGE POSTPROCESSING, ASSESSMENT OF LEFT VENTRICULAR [LV] CARDIAC FUNCTION, RIGHT VENTRICULAR [RV] STRUCTURE AND FUNCTION AND EVALUATION OF VASCULAR STRUCTURES, IF PERFORMED)
Source: CMS coverage guidance
CPT 75571high
COMPUTED TOMOGRAPHY, HEART, WITHOUT CONTRAST MATERIAL, WITH QUANTITATIVE EVALUATION OF CORONARY CALCIUM
Source: CMS coverage guidance
CPT 93306high
ECHOCARDIOGRAPHY, TRANSTHORACIC, REAL-TIME WITH IMAGE DOCUMENTATION (2D), INCLUDES M-MODE RECORDING, WHEN PERFORMED, COMPLETE, WITH SPECTRAL DOPPLER ECHOCARDIOGRAPHY, AND WITH COLOR FLOW DOPPLER ECHOCARDIOGRAPHY
Source: CMS coverage guidance
CPT 93307high
ECHOCARDIOGRAPHY, TRANSTHORACIC, REAL-TIME WITH IMAGE DOCUMENTATION (2D), INCLUDES M-MODE RECORDING, WHEN PERFORMED, COMPLETE, WITHOUT SPECTRAL OR COLOR DOPPLER ECHOCARDIOGRAPHY
Source: CMS coverage guidance

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
I25.9

Common synonyms

Chronic ischemic heart disease, unspecifiedChronic ischemic heart disease

Frequently asked questions

Code details

CodeI25.9
SystemICD10
Display nameChronic ischemic heart disease, unspecified
ChapterDiseases of the circulatory system (I00-I99)
BlockIschemic heart diseases

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
DeformityDeformityDisease, diseasedIschemia, ischemicIschemia, ischemicIschemia, ischemic
See also
Angina

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.