ICD-10-CM 2027
ICD-10 code for heart aneurysm
From the official ICD-10-CM alphabetic index entry “Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › heart (wall) (chronic or with a stated duration of over 4 weeks)”. Page updated September 29, 2026.
About coding heart aneurysm
The ICD-10-CM code for heart aneurysm is I25.3 (Aneurysm of heart).
Within I25 (chronic ischemic heart disease), I25.3 is specifically for aneurysm of heart. Related codes cover Atherosclerotic heart disease of native coronary artery (I25.1), old myocardial infarction (I25.2), coronary artery aneurysm and dissection (I25.4), ischemic cardiomyopathy (I25.5), Silent myocardial ischemia (I25.6), atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7), other forms of chronic ischemic heart disease (I25.8) and unspecified (I25.9).
Use an additional code to identify: chronic total occlusion of coronary artery (I25.82), exposure to environmental tobacco smoke (Z77.22), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and 1 more.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific heart aneurysm codes (official index)
- valve
Common questions about heart aneurysm ICD-10 codes
What is the ICD-10 code for heart aneurysm?
- I25.3 — Aneurysm of heart.
Is I25.3 billable?
- Yes. I25.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I25.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I25.3 as a principal diagnosis.
Is I25.3 a CC or MCC?
- I25.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.