Ischemic heart diseases (I20-I25) ICD-10-CM
The I20–I25 section covers ischemic heart diseases with 119 ICD-10-CM diagnosis codes, of which 94 are billable in fiscal year 2027. The section is organized into the 6 code ranges listed below.
Code Also
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
Code Ranges in This Section 6 ranges · 119 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the I20–I25 Code Range
These heart conditions include episodes of pain when the heart muscle needs more oxygen than its blood supply provides. They also include heart attacks, complications after heart attacks, and other acute or chronic disease linked to reduced blood supply.
I20 separates angina by form, including unstable angina and angina with documented spasm. I21 covers acute heart attacks, when interrupted blood supply causes heart muscle to die. Its subdivisions distinguish ST-elevation from non-ST-elevation heart attacks and, for ST-elevation heart attacks, identify the affected wall or site.
I22 groups subsequent heart attacks by type and, for ST-elevation attacks, by site. I23 separates current complications after a heart attack, such as ruptures, clots, and angina. I24 covers other acute conditions, including a coronary artery clot without a heart attack. I25 groups chronic conditions, including disease of native coronary arteries or bypass grafts and old heart attacks.
Questions About This Page
How many codes are in the I20-I25 range?
The I20-I25 range contains 119 ICD-10-CM diagnosis codes in FY 2027. 94 of them are billable, and the rest are category headers that organize the section.
What conditions does I20-I25 cover?
The range covers ischemic heart diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
