2026 ICD-10-CM Diagnosis Code I5ANon-ischemic myocardial injury (non-traumatic)

ICD-10-CM CodesI00–I99I30-I5Anon-traumatic

ICD-10-CM I5A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I5A is a billable ICD-10-CM diagnosis code for non-ischemic myocardial injury (non-traumatic). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 63 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined heart disease.

Code Identity

ICD-10-CM Code
I5A
Billable Status
Yes — Valid for Submission
Code Describes
Non-ischemic myocardial injury (non-traumatic)
Short Description
Non-ischemic myocardial injury (non-traumatic)
Same as the full description in the CMS dataset.
Chapter
I30-I5A
Other forms of heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
Categorynon-traumaticNon-ischemic myocardial injury (I5A)
This CodeI5ANon-ischemic myocardial injury (non-traumatic)

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

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

Code First

  • 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

Type 1 Excludes

  • acute myocardial infarction I21
  • injury of heart S26

Type 2 Excludes

  • other acute ischemic heart diseases I24

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR015
Other and ill-defined heart disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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.

The full article covers:

  • What is heart disease?
  • What are the types of heart disease?
  • What causes heart diseases?
  • Who is more likely to develop heart diseases?
  • What are the symptoms of heart disease?
  • How are heart diseases diagnosed?
  • What are the treatments for heart disease?
  • Can heart diseases be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement I5A replaces the following previously assigned code(s):

  • I21.A9 - Other myocardial infarction type
FY 2022AddedAdded to the ICD-10-CM code setEffective October 1, 2021.
FY 2023–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I5AOverview

What is the ICD-10 code for non-ischemic myocardial injury (non-traumatic)?

The ICD-10-CM code for non-ischemic myocardial injury (non-traumatic) is I5A. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is I5A (Non-ischemic myocardial injury (non-traumatic)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report non-ischemic myocardial injury (non-traumatic) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I5A group to?

When non-ischemic myocardial injury (non-traumatic) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.

Is I5A a CC or MCC?

CMS lists I5A as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 63 closely related codes in its exclusion list.