Is I22.1 a billable ICD-10-CM code?

Yes. I22.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I22.1 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).

What cannot be coded together with I22.1?

I22.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above I22.1 (I22) and apply to it just the same.

I22.1

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

Billable / specific codeICD-10-CM

I22.1 is a billable, specific ICD-10-CM code for subsequent st elevation (stemi) myocardial infarction of inferior wall. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same 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)

Excludes1 inherited from the categories above I22.1

These are not written on I22.1, but they bind it: a note on a category applies to every code beneath it. Billing I22.1 with anything listed here is a denial.

Written on I22 — Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

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

Other codes that can never be billed with I22.1

These codes carry an Excludes1 note pointing at I22.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I22.1 alone.

I25.82Chronic total occlusion of coronary artery

Risk adjustment

I22.1 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 228 Acute Myocardial Infarction0.252 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

I22.1 is named in 61 Medicare coverage policies — 61 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52458Automatic External Defibrillators - Policy Article
A52458Automatic External Defibrillators - Policy Article
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography

How I22.1 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I22.1.

Infarct, infarction›myocardium, myocardial›subsequent›diaphragmatic(wall)
Infarct, infarction›myocardium, myocardial›subsequent›inferior(diaphragmatic) (inferolateral) (inferoposterior) (wall)
Infarct, infarction›myocardium, myocardial›ST elevation›inferior NEC›subsequent
Infarct, infarction›myocardium, myocardial›subsequent›ST elevation›inferior(diaphragmatic) (inferolateral) (inferoposterior) (wall)
Infarct, infarction›myocardium, myocardial›subsequent›transmural›diaphragmatic(wall)
Infarct, infarction›myocardium, myocardial›subsequent›transmural›inferior(diaphragmatic) (inferolateral) (inferoposterior) (wall)

Code history

I22.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share I22. If I22.1 is not quite right, the correct code is usually one of these.

Questions about I22.1

Is I22.1 a billable ICD-10-CM code?: Yes. I22.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I22.1 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).
What cannot be coded together with I22.1?: I22.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above I22.1 (I22) and apply to it just the same.