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.

Check I22.1 with the rest of the claim: free scrubber

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

A category’s note binds every code beneath it.

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

Their own Excludes1 notes name this code, so the conflict is not listed above.

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. Look up the whole chart to see which of its HCCs the hierarchy would zero.

Medicare coverage

I22.1 is named in 43 Medicare coverage policies: 43 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52458Automatic External Defibrillators - Policy Article
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A53775Billing and Coding: Frequency and Duration for Cardiac Rehabilitation and Intensive Cardiac Rehabilitation
A56423Billing and Coding: Cardiology Non-emergent Outpatient Stress Testing

Alphabetic index entries that lead here

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

Unchanged in every release from FY2024 to FY2027.