2026 ICD-10-CM Diagnosis Code I25.82Chronic total occlusion of coronary artery
ICD-10-CM Codes›I00–I99›I20-I25›I25
- Billable — Valid for Submission
- Not a Principal Diagnosis
- Chronic Condition
I25.82 is a billable ICD-10-CM diagnosis code for chronic total occlusion of coronary artery. 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. 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
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for I25.82.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic total occlusion of coronary artery
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Complete occlusion of coronary artery
- Total occlusion of coronary artery
Code First
Type 1 Excludes
- acute coronary occlusion with myocardial infarction I21.0 I21.B I22
- acute coronary occlusion without myocardial infarction I24.0
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.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
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.
- artery - See Also: Atherosclerosis, artery; - I70.9
- complete
- coronary - I25.82
- coronary (acute) (thrombotic) (without myocardial infarction) - I24.0
- chronic total - I25.82
- complete - I25.82
- total (chronic) - I25.82
- coronary - I25.82
- coronary (artery) (vein) (thrombotic) - See Also: Infarct, myocardium;
- chronic total - I25.82
- total (chronic) - I25.82
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Occlusion, occluded
- artery
- complete
- coronary
- Occlusion, occluded
- artery
- coronary (acute) (thrombotic) (without myocardial infarction)
- chronic total
- Occlusion, occluded
- artery
- coronary (acute) (thrombotic) (without myocardial infarction)
- complete
- Occlusion, occluded
- artery
- coronary (acute) (thrombotic) (without myocardial infarction)
- total (chronic)
- Occlusion, occluded
- artery
- total (chronic)
- coronary
- Occlusion, occluded
- coronary (artery) (vein) (thrombotic)
- chronic total
- Occlusion, occluded
- coronary (artery) (vein) (thrombotic)
- total (chronic)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 I25.82 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I25.82Overview
Is I25.82 (Other forms of chronic ischemic heart disease) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report chronic total occlusion of coronary artery on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I25.82 group to?
On inpatient claims, chronic total occlusion of coronary artery 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 I25.82 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because chronic total occlusion of coronary artery 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 I25.82?
Under the General Equivalence Mappings, chronic total occlusion of coronary artery converts to ICD-9-CM 414.2 (chr tot occlus cor artry). 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.
