All ICD10 Codes
I5ABillable, valid for claims from October 1, 2026

Non-ischemic myocardial injury (non-traumatic)

In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

  • I5A is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under I30-I5A below.
  • As a secondary diagnosis it is a CC (complication or comorbidity), which can raise the MS-DRG payment. It doesn't count when the principal diagnosis is one of 66 closely related codes.
  • Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
  • AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).

Also indexed as: Injury, heart, non-traumatic; Injury, myocardial; Neurogenic stunned myocardium; Stunned myocardium

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Instructional notes

Includes: conditions that are coded here

  • Acute (non-ischemic) myocardial injury
  • Chronic (non-ischemic) myocardial injury
  • Unspecified (non-ischemic) myocardial injury

Excludes1: not coded here, use a different code

  • acute myocardial infarction (I21.-)
  • injury of heart (S26.-)

Excludes2: not included here, code separately if applicable

  • other acute ischemic heart diseases (I24.-)

Code first: code the underlying condition first, then this code

  • the underlying cause, if known and applicable, such as:
  • acute kidney failure (N17.-)
  • acute myocarditis (I40.-)
  • cardiomyopathy (I42.-)
  • chronic kidney disease (CKD) (N18.-)
  • heart failure (I50.-)
  • hypertensive urgency (I16.0)
  • nonrheumatic aortic valve disorders (I35.-)
  • paroxysmal tachycardia (I47.-)
  • pulmonary embolism (I26.-)
  • pulmonary hypertension (I27.0, I27.2-)
  • sepsis (A41.-)
  • takotsubo syndrome (I51.81)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.

Read Section I.C.9 (page 50)

Other codes under I30-I5A

Other forms of heart disease (I30-I5A)

I5A MS-DRGs

As the principal diagnosis, I5A groups to MS-DRG 314, 315, or 316 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Related conditions

Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.

I5A is in Other and ill-defined heart disease (CIR015, its default category), with 36 codes. Others in it:

  • I25.3 Aneurysm of heart
  • I25.41 Coronary artery aneurysm
  • I51.0 Cardiac septal defect, acquired
  • I51.1 Rupture of chordae tendineae, not elsewhere classified
  • I51.2 Rupture of papillary muscle, not elsewhere classified
  • I51.3 Intracardiac thrombosis, not elsewhere classified
  • I51.5 Myocardial degeneration
  • I51.7 Cardiomegaly

Medicare coverage articles listing I5A

These 5 Medicare billing and coding articles list I5A as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.

Other codes that refer to I5A

Notes on these codes point to I5A.

  • I24 Excludes2: non-ischemic myocardial injury (I5A)
  • I25 Excludes2: non-ischemic myocardial injury (I5A)
  • Z82.4 Includes: Conditions classifiable to I00-I5A, I65-I99

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Heart Diseases

Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.

Read more about heart diseases on MedlinePlus

Code history

Added in FY2022 (effective October 1, 2021). Before that, these cases were coded as I21.A9 (Other myocardial infarction type). No changes since.