I21.21

Billable

ChapterI00–I99

Ranksubcategory

Official Description

ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery

Metadata & Insights

•Billable/specific code (valid for reimbursement).
•Chapter 9: Diseases of the Circulatory System (I00-I99).

Instructional Notes

Includes

ST elevation (STEMI) myocardial infarction involving oblique marginal coronary artery

General instructions are available for the parent sections:

View CH9 Notes View I20-I25 Notes View I21 Notes View I21.2 Notes

Clinical Hierarchy

BillableHas subcodes

CH9Diseases of the circulatory system (I00-I99)

I20-I25Ischemic heart diseases (I20-I25)

I21Acute myocardial infarction

I21.2ST elevation (STEMI) myocardial infarction of other sites

I21.21ST elevation (STEMI) myocardial infarction involving left circumflex coronary arteryBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I21.21:

subcategoryI21.2

ST elevation (STEMI) myocardial infarction of other sites

View context instructions

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 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 280

Acute Myocardial Infarction, Discharged Alive with MCC

DRG 281

Acute Myocardial Infarction, Discharged Alive with CC

DRG 282

Acute Myocardial Infarction, Discharged Alive without CC/MCC

DRG 283

Acute Myocardial Infarction, Expired with MCC

DRG 284

Acute Myocardial Infarction, Expired with CC

DRG 285

Acute Myocardial Infarction, Expired without CC/MCC

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery.

Search PCS Codes