Alphabetic Index FY2027

I5A

Non-ischemic myocardial injury (non-traumatic)

FY2027Chapter 9: Diseases of the circulatory system/I30–I5A Other forms of heart disease

BillableComplete code, valid to report
Care settingsHospital CC

I5A is a billable ICD-10-CM diagnosis code for non-ischemic myocardial injury (non-traumatic). It is part of the FY2027 code set, effective October 1, 2026. The Alphabetic Index lists it under 4 entries. Its coding notes include a Code first instruction, 2 Excludes1 entries and 11 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

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)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

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

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
  • other acute ischemic heart diseases (I24.-)
Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Hospital CC

Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 66 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.

Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix C

Inclusion terms

Conditions classified to this code.

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

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 4 entries