I22.8 — Subsequent ST elevation (STEMI) myocardial infarction of other sites

BillableMCC

Is I22.8 billable?

Yes — I22.8 is billable for FY2027. I22.8 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I22.8 may be submitted for encounters from October 1, 2026 through September 30, 2027.

I22.8 at a glance

Code	I22.8
Description	Subsequent ST elevation (STEMI) myocardial infarction of other sites
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does I22.8 group to?

I22.8 sits in MDC 05 and helps define the logic of 6 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

280Acute Myocardial Infarction, Discharged Alive with MCCmedical
281Acute Myocardial Infarction, Discharged Alive with CCmedical
282Acute Myocardial Infarction, Discharged Alive without CC/MCCmedical
283Acute Myocardial Infarction, Expired with MCCmedical
284Acute Myocardial Infarction, Expired with CCmedical
285Acute Myocardial Infarction, Expired without CC/MCCmedical

As a secondary diagnosis, I22.8 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.

How is I22.8 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to I22.8. They show the wording a clinician may have documented, which often differs from the Tabular description.

Infarct, infarction › myocardium, myocardial › subsequent › lateral
Infarct, infarction › myocardium, myocardial › subsequent › posterior
Infarct, infarction › myocardium, myocardial › subsequent › septal
Infarct, infarction › myocardium, myocardial › subsequent › specified NEC
Infarct, infarction › myocardium, myocardial › ST elevation › lateral › subsequent
Infarct, infarction › myocardium, myocardial › ST elevation › posterior › subsequent
Infarct, infarction › myocardium, myocardial › ST elevation › septal › subsequent
Infarct, infarction › myocardium, myocardial › ST elevation › specified NEC › subsequent
Infarct, infarction › myocardium, myocardial › subsequent › ST elevation › specified NEC
Infarct, infarction › myocardium, myocardial › subsequent › transmural › lateral
Infarct, infarction › myocardium, myocardial › subsequent › transmural › posterior
Infarct, infarction › myocardium, myocardial › subsequent › transmural › specified NEC

Inclusion terms

Alternative wording in documentation that is classified to I22.8.

Subsequent acute transmural myocardial infarction of other sites
Subsequent apical-lateral transmural (Q wave) myocardial infarction (acute)
Subsequent basal-lateral transmural (Q wave) myocardial infarction (acute)
Subsequent high lateral transmural (Q wave) myocardial infarction (acute)
Subsequent transmural (Q wave) myocardial infarction (acute)(of) lateral (wall) NOS
Subsequent posterior (true) transmural (Q wave) myocardial infarction (acute)
Subsequent posterobasal transmural (Q wave) myocardial infarction (acute)
Subsequent posterolateral transmural (Q wave) myocardial infarction (acute)
Subsequent posteroseptal transmural (Q wave) myocardial infarction (acute)
Subsequent septal NOS transmural (Q wave) myocardial infarction (acute)

Excludes1 — never code together — inherited from I22

The conditions below can never be reported together with I22.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

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

Use additional code — inherited from I22

Report an additional code alongside I22.8 to fully describe the condition. I22.8 is sequenced first.

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)

Excludes2 — not included here — inherited from Chapter 9

The conditions below are not part of I22.8, but a patient may have both at the same time. When documentation supports it, I22.8 and the excluded code may both be reported.

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.-)

Code also — inherited from I20-I25

Two codes may be needed to describe the condition fully. Whether I22.8 is sequenced first depends on the reason for the encounter.

the presence of hypertension (I10-I1A)

How long has I22.8 existed?

I22.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.