ICD-10-CM Diagnosis Code (2025)
Official Description for I21.21
ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
Coding Notes & Guidelines for I21.21
ST elevation (STEMI) myocardial infarction involving oblique marginal coronary artery
Parent Code (Less Specific):
About ICD-10-CM Code I21.21 (ST elevation)
ICD-10-CM code I21.21 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM I21.21 became effective on October 1, 2024.
This page provides detailed information about I21.21 - ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like ST elevation.