Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.
Applicable to
Myocardial infarction associated with revascularization procedure
Myocardial infarction type 3
Myocardial infarction type 4a
Myocardial infarction type 4b
Myocardial infarction type 4c
Myocardial infarction type 5
Code first
, if applicable, postprocedural myocardial infarction following cardiac surgery (I97.190), or postprocedural myocardial infarction during cardiac surgery (I97.790)
Code also
complication, if known and applicable, such as:
(acute) stent occlusion (T82.897-)
(acute) stent stenosis (T82.855-)
(acute) stent thrombosis (T82.867-)
cardiac arrest due to underlying cardiac condition (I46.2)
complication of percutaneous coronary intervention (PCI) (I97.89)
occlusion of coronary artery bypass graft (T82.218-)
Applies from I21 Acute myocardial infarction
Includes
cardiac infarction
coronary (artery) embolism
coronary (artery) occlusion
coronary (artery) rupture
coronary (artery) thrombosis
infarction of heart, myocardium, or ventricle
myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
Excludes2 (not included here)
old myocardial infarction (I25.2)
postmyocardial infarction syndrome (I24.1)
subsequent type 1 myocardial infarction (I22.-)
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)
410.90 Acute myocardial infarction of unspecified site, episode of care unspecified (approximate)
410.91 Acute myocardial infarction of unspecified site, initial episode of care (approximate)
410.92 Acute myocardial infarction of unspecified site, subsequent episode of care (approximate)
Code annotations containing back-references to I21.A9
Back-references to I21.A9
Type 1 Excludes: I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction ("subsequent myocardial infarction of other type (type 3) (type 4) (type 5) (I21.A9)")
Back-references to I21
Use Additional: I16.1 Hypertensive emergency ("acute myocardial infarction (I21.-)")
Type 2 Excludes: I74 Arterial embolism and thrombosis ("coronary embolism and thrombosis (I21-I25)")
Type 2 Excludes: I82 Other venous embolism and thrombosis ("coronary (I21-I25)")
Code First: Z92.82 Status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility ("acute myocardial infarction (I21.-, I22.-)")
Diagnosis Index entries for I21.A9
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › associated with revascularization procedure
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › subsequent (recurrent) (reinfarction) › type 3
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › subsequent (recurrent) (reinfarction) › type 4
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › subsequent (recurrent) (reinfarction) › type 5
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › type 3
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › type 4 (a) (b) (c)
Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › type 5
Nearby codes
I21.3 ST elevation (STEMI) myocardial infarction of unspecified site