I24.9: Acute ischemic heart disease, unspecified
I24.9 is a billable, specific ICD-10-CM code for acute ischemic heart disease, unspecified. It is valid for submission on a claim.
Check I24.9 with the rest of the claim: free scrubberExcludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- ischemic heart disease (chronic) NOS (I25.9)
Excludes1 inherited from the categories above I24.9
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above I24.9
Not part of this code, but both may be coded when both are present.
Written on I24: Other acute ischemic heart diseases
- non-ischemic myocardial injury (I5A)
Risk adjustment
I24.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 229 Unstable Angina and Other Acute Ischemic Heart Disease0.240 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.
Medicare coverage
I24.9 is named in 15 Medicare coverage policies: 15 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A56476Billing and Coding: Cardiac Radionuclide Imaging
- A56494Billing and Coding: Cardiovascular Nuclear Medicine
- A56500Billing and Coding: Cardiac Catheterization and Coronary Angiography
Alphabetic index entries that lead here
- Cyanotic heart disease
- Ischemia, ischemic›heart›acute or with a stated duration of 4 weeks or less
- Ischemia, ischemic›heart›subacute
- Syndrome›coronary›acute NEC
Code history
Unchanged in every release from FY2024 to FY2027.