I22.9 – Subsequent ST elevation (STEMI) myocardial infarction of unspecified site

ICD-10-CM 2027 diagnosis code · Ischemic heart diseases

Billable code

ICD-10-CM code I22.9
Code
I22.9 (claims format: I229)
Description
Subsequent ST elevation (STEMI) myocardial infarction of unspecified site
Short description
Subsequent STEMI of unsp site
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
9. Diseases of the circulatory system (I00-I99)
Block
I20-I25 Ischemic heart diseases
Parent codes
I22

Notes for I22.9

Applicable to:
  • Subsequent acute myocardial infarction of unspecified site
  • Subsequent myocardial infarction (acute) NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I22 – Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

Includes:
  • acute myocardial infarction occurring within four weeks (28 days) of a previous acute myocardial infarction, regardless of site
  • cardiac infarction
  • coronary (artery) embolism
  • coronary (artery) occlusion
  • coronary (artery) rupture
  • coronary (artery) thrombosis
  • infarction of heart, myocardium, or ventricle
  • recurrent myocardial infarction
  • reinfarction of myocardium
  • rupture of heart, myocardium, or ventricle
  • subsequent type 1 myocardial infarction
Excludes1 (not coded here):
  • subsequent myocardial infarction, type 2 (I21.A1)
  • subsequent myocardial infarction of other type (type 3) (type 4) (type 5) (I21.A9)
Use additional code:
  • code, if applicable, to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Block I20-I25

Code also:
  • the presence of hypertension (I10-I1A)

Index terms for I22.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I22

Frequently asked questions

What is ICD-10 code I22.9?

I22.9 is the ICD-10-CM code for subsequent ST elevation (STEMI) myocardial infarction of unspecified site, in the block I20-I25 (Ischemic heart diseases).

Is I22.9 a billable code?

Yes. I22.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I22.9 belong to?

It belongs to category I22 – Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.