Other acute ischemic heart diseases (I24) ICD-10-CM
The I24 code range covers other acute ischemic heart diseases with 7 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
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.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- non-ischemic myocardial injury I5A
Codes in the I24 Range 7 codes · 5 billable
- I24 Other acute ischemic heart diseasesNon-billable
- I24.0 Acute coronary thrombosis not resulting in myocardial infarction
- I24.1 Dressler's syndrome
- I24.8 Other forms of acute ischemic heart diseaseNon-billable
- I24.81 Acute coronary microvascular dysfunction
- I24.89 Other forms of acute ischemic heart disease
- I24.9 Acute ischemic heart disease, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I24 range.
Acute Coronary Syndrome
An episode of MYOCARDIAL ISCHEMIA that generally lasts longer than a transient anginal episode that ultimately may lead to MYOCARDIAL INFARCTION.
Coronary Occlusion
Complete blockage of blood flow through one of the CORONARY ARTERIES, usually from CORONARY ATHEROSCLEROSIS.
About the I24 Code Range
The ICD-10 codes within category I24 cover various types of other acute ischemic heart diseases that are distinct from classic heart attacks. These codes are used to identify specific heart conditions caused by sudden inadequate blood flow to heart tissue without necessarily resulting in a full myocardial infarction.
This section includes I24.0 for acute coronary thrombosis not resulting in myocardial infarction, which describes blockages such as right or left coronary artery thrombosis that cause ischemia without heart muscle death. I24.1 designates Dressler’s syndrome, a post-heart attack inflammatory condition also known as postmyocardial infarction pericarditis. Other codes like I24.8 and I24.89 cover various other acute ischemic conditions, including acute coronary microvascular dysfunction and acute coronary insufficiency, both related to disrupted oxygen supply to the heart. When the specific ischemic cause is unclear, I24.9 is used as an unspecified code. Understanding these distinctions helps medical coders correctly apply the ICD-10 code for acute ischemic heart disease cases that do not fit typical myocardial infarction definitions.
Questions About This Page
How many billable codes are in the I24 range?
Of the 7 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I24 range classify?
The range classifies other acute ischemic heart diseases. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
