I22.9

ICD-10Billable

Subsequent STEMI of unsp site

Official ICD-10-CM descriptor (FY2026)

Subsequent ST elevation (STEMI) myocardial infarction of unspecified site

I22.9 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Subsequent acute myocardial infarction of unspecified site
  • Subsequent myocardial infarction (acute) NOS

Related codes in I22

Where this code sits

Parent code
I22

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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