ICD-10-CM code · FY2027

I22.1 Subsequent ST elevation (STEMI) myocardial infarction of inferior wall

BillableValid for claims as a specific diagnosis code

About I22.1

Code: I22.1
Billable: Yes
Short description: Subsequent STEMI of inferior wall
Category: I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
Block: I20-I25 Ischemic heart diseases
Chapter: 9 Diseases of the circulatory system
Code set: FY2027, October 1, 2026 to September 30, 2027

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Coding notes for I22.1

Applicable to Other names for conditions reported with this code.

Subsequent acute transmural myocardial infarction of inferior wall
Subsequent transmural (Q wave) infarction (acute)(of) diaphragmatic wall
Subsequent transmural (Q wave) infarction (acute)(of) inferior (wall) NOS
Subsequent inferolateral transmural (Q wave) infarction (acute)
Subsequent inferoposterior transmural (Q wave) infarction (acute)

Also applies, from I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

Includes Conditions this code covers.

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: never report these together with this code (use the code given instead).

subsequent myocardial infarction, type 2 (I21.A1)
subsequent myocardial infarction of other type (type 3) (type 4) (type 5) (I21.A9)

Use additional code Add a second code for the detail named here.

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 notes (apply to every code in it)

Code also Another code may be needed as well; the order depends on the encounter.

the presence of hypertension (I10-I1A)

Chapter 9 notes (apply to every code in it)

Excludes2 Not part of this condition, but a patient can have both: report both codes when both apply.

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.-)

Related codes in I22

Latest research on recurrent myocardial infarction

Multidomain rehabilitation after myocardial infarction improves outcomes in older adultsOct 15, 2025 · Cardiology
Living in a marginalized neighbourhood is associated with worse outcomes in patients with myocardial infarctionJul 12, 2025 · Cardiology
Spironolactone ineffective for patients with preserved ejection fraction after myocardial infarctionMar 4, 2025 · Cardiology
Beta-blocker interruption not noninferior to continuation following myocardial infarctionNov 21, 2024 · Cardiology
Plasma progranulin levels are correlated with left ventricular function recovery following myocardial infarctionNov 15, 2024 · Cardiology

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ICD-10-CM FY2027 code set, as published by the CDC National Center for Health Statistics (NCHS) and CMS, effective October 1, 2026 to September 30, 2027. Codes, titles and notes are shown as published. Check payer rules and the official guidelines before billing. This page is not medical advice.