All ICD10 Codes

I21.1

Non-Billable
ChapterI00–I99
Ranksubcategory
Official Description

ST elevation (STEMI) myocardial infarction of inferior wall

Use a more specific code (2 billable)
I21.11ST elevation (STEMI) myocardial infarction involving right coronary arteryI21.19ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

Instructional Notes

Includes
  • Type 1 ST elevation myocardial infarction of inferior wall
General instructions are available for the parent sections:
View CH9 NotesView I20-I25 NotesView I21 Notes

Clinical Hierarchy

BillableHas subcodes
CH9Diseases of the circulatory system (I00-I99)
I20-I25Ischemic heart diseases (I20-I25)
I21Acute myocardial infarction
I21.1ST elevation (STEMI) myocardial infarction of inferior wallNot billable
I21.11ST elevation (STEMI) myocardial infarction involving right coronary arteryBillable
I21.19ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wallBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I21.1:

categoryI21
Acute myocardial infarction
View context instructions
blockI20-I25
Ischemic heart diseases (I20-I25)
View context instructions
chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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