I5A ICD-10-CM Code: Non-ischemic myocardial injury (non-traumatic)

I5A is the ICD-10-CM diagnosis code for non-ischemic myocardial injury (non-traumatic). This code describes damage to the heart muscle that is not caused by blocked blood vessels (non-ischemic) and is not from trauma or injury. The heart muscle is weakened or injured from other causes such as infection, inflammation, toxins, or stress. I5A sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering other forms of heart disease (i30-i5a).

I5A is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Always investigate the underlying cause of the myocardial injury, as the etiology (such as sepsis, myocarditis, or takotsubo cardiomyopathy) should be coded separately to provide complete clinical documentation.